diff --git a/dev-lang/rust-bin/Manifest b/dev-lang/rust-bin/Manifest
index 7be42f0ed382d..e4df8056959c9 100644
--- a/dev-lang/rust-bin/Manifest
+++ b/dev-lang/rust-bin/Manifest
@@ -551,6 +551,34 @@ DIST rust-1.87.0-x86_64-unknown-linux-gnu.tar.xz 198639092 BLAKE2B 908c974cc044e
 DIST rust-1.87.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B edac3e21d9414e774c507a352664f6d73beb78ca3b4f19c95097e073b461d10aeef8d0b2bcf0457b8944c40327f04907c05edcc92070cc10958a9deb1d843bc7 SHA512 1946680287698a07a922c18b74d27c1de374eed86624aeb76167aafcd0acc8ad4bca57fea5a8f8420deadcaf819be6ea0c47b8ca97033cd94578037fbbc86168
 DIST rust-1.87.0-x86_64-unknown-linux-musl.tar.xz 292508024 BLAKE2B 2fdf8a2be388bbfeb52211c372b95f42563ef762883d4634f857545a3bdcf9fa6c41c9099df1a26b936f3a3e9e8679d891d3ed80e593e405663f02421fadad6c SHA512 9629d62407eb517e09b21cca83ae1528b60b589df29ee12d99e7f334c234cdd9e24c497c175b4e83b8a993f6117e17a8004b350a28868d7e5247c26dd165d253
 DIST rust-1.87.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 9ee89dcd5bca680c4b6c13b85166d4d7d6bf1c685931a6466e8701868840136376ae8980931e5cf91f82da1cec7f9bfc0ec74576d5e57eb14991d7d398524cd7 SHA512 5985a66b9c898f71864c5f18104a92930bfd20acd827efd0d7222c28da25fc96ca72f72c880be0b75ed25ea381f9d7e07e2e1243c4b465eb4903073bb74691bf
+DIST rust-1.88.0_beta20250526-aarch64-unknown-linux-gnu.tar.xz 165315676 BLAKE2B 5011d0b4507462cc230696942496342fbc576dc398198b7897aed08985c60d009a96c741ad33bd0ff41eff78b45b05eac737f037f707dc008b4f08930294db6d SHA512 a7edd10983f7de4b6cabafccacb215999391d3c33fa2eee2a425ae0116372e207514254cdba1c798dbdc4faa1b0b4cfa6fe158c4b924d1d95dd49034dd593b22
+DIST rust-1.88.0_beta20250526-aarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 99e83ee876ecc402d26e0c86f22289038841e4a7cb3554536e1d805fadc6a81a59fb403ab63ccaf885ad815871ab9c6aecbe41afd2059a6cb952c323d60d5bd3 SHA512 38eaa3c4afc5426e1a3a9c6a2cae45f1bb8d20806e66b9fbf678d046cd6636fff8d544db2a5d2aa852deac6fc1ce5bf0a06eacb829748a9c42f491da83751389
+DIST rust-1.88.0_beta20250526-aarch64-unknown-linux-musl.tar.xz 243946068 BLAKE2B a37ff77ffa2964e412dd2eaa2426b65d6e51c610cad38378c1e95fb9c51ace8dc9028cfe96e84eeddd7b450ac30c1684f3febd2d438cb3b92be86a92d6262a0b SHA512 377b2d6c44ea7aeb16a56698105423868d6d81df1fa7412a94b26b3edb1a39af9280e0fcf8baee2e680806f0f0b4d81a2debc8f3ce6e6864ae2602e01391a737
+DIST rust-1.88.0_beta20250526-aarch64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B ba903c4d3d2ab4304bfc95632ebec42b76e5f38a176ec1928910751c0b8f05544849d191c8ef660696a4d76ae65d0b5dcb8ed1059b11615227d74fb0f0ddadb8 SHA512 0d72b6d4c4dcee6a0ef6e705b731e90e03f60bed72c7d92ac281e70dc0f87a58344a5c97057117c80a7656f378a6c9a1f3961357fd49128192f0ceaf9827f2ca
+DIST rust-1.88.0_beta20250526-arm-unknown-linux-gnueabi.tar.xz 229389328 BLAKE2B 9aa0753d731abcdc493a817247adbad1421c5d61246209805ab5025409b2287c573d1cf8a0c1a91fcc68280524991a578dec6502234ea4a545c8f1176c22dbc0 SHA512 c6189f9939389f3bb3e7fbbcfe56beb3abce395ac42323fa97fce479a3f20431b03d702978f005c9a0df234bdd0654048d5254e9f484f33ac74cc60adad9bea8
+DIST rust-1.88.0_beta20250526-arm-unknown-linux-gnueabi.tar.xz.asc 801 BLAKE2B 07eee2c415503600b5d4299e5f05e884e47e3c353c11dd060100c3108f880a1250506aeaca296675cd33ba2c9741fb2a24000f151ba18e104cd71e1c55316cd4 SHA512 394ec48a653a8b93d0532f2f6df27dc273bbd948d2690f193004b4dbc416717d710cd2c5f3b6da970bba09367176b93a45d6466b552276935572e7f88de9827d
+DIST rust-1.88.0_beta20250526-arm-unknown-linux-gnueabihf.tar.xz 229713968 BLAKE2B 6e2b361247abec64200820bf36fa74d5ef43e616ac3eabc5b948f7483f683526683b0c89b5c452f446a958aee989ed8d5fa1f64951389439230910ed13d1f488 SHA512 036ebff25321f4f62189b744857b445a79a34962032c92d35755c0cdac4095c0cdb2ed73d1b136a6f344458a6bd0a51857c122539d5fb5106a7972aa7338ce2a
+DIST rust-1.88.0_beta20250526-arm-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 8113dafc49ee2d04975bc510123486ab4b5d3d809ac843557c8404584ffc44b8467d0c915e1c207f2ab1a0e1a02e754f707577b87c4ef241d5f235f60747c732 SHA512 0425892113097b457a06cb260511a67b0107468fc685ff4034d11449f97ac0e2ed9b5ca0dae36f6ce0cbea872c592988c865b1991f22c4c4d68411c7dba8768a
+DIST rust-1.88.0_beta20250526-armv7-unknown-linux-gnueabihf.tar.xz 235456424 BLAKE2B 54bec2fe1a8967d541f162fda8530b1a2d847a223b2edc9a37f285ee32bd99fa40cfd36df38055be76e4a1c894cdf54314b28d822228191e533a6550f6590217 SHA512 670975a615c81e0c45d40824aa2bd3a15c745d6e4e896d94882c8036bf98fc392d59f877061fbf8b0885e2ebee0187e98f5533ffaca8d070602800b9026d4076
+DIST rust-1.88.0_beta20250526-armv7-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 06e50a4e5c3006c1f85eca5ea35638affee6a6f854ecc40b6ba36a913f634ee9d3649da1fe4bfb64e3d093983eb14568fdbb5b458059837d9fde0103e2fd1222 SHA512 5ee5ecdce8b30354e6094c7cbabfdf942288e53b5aef6e8d36944d30ffef526d4b7c2d7d17c05caf48d6f5a597799fa167f54e216122dcd741fd4af3c7de8172
+DIST rust-1.88.0_beta20250526-i686-unknown-linux-gnu.tar.xz 261911348 BLAKE2B c1d48ad71cb2b8b12cc6c2d3a1a0d620cc74a260416e037d804d3142e055ae8e8a1e7fb40ce89f8935037d5d97357d1255c9f22377028b1a4e4bba3b1a819e80 SHA512 a16188f8459d658301e6d3a85f5ef7f811cc2ceb7181e83d5394c3c26c75fadf2198ec6fa63fe496e94ad0734bd888021eb1a554f612bed01d1aebb87f820eda
+DIST rust-1.88.0_beta20250526-i686-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B fe93010560fc2e5b888246c1410d8375d1c9eb488caba10ceac4a4f9c12a7e169fd6213e7949392036705e4b8a654dc394e7d3f8252735da9c80892a969d3d20 SHA512 93c5e9f2790a6b4b7d324ab7f4b5385225e049cee423092cf1997a41dffd84327ec32be4decd9a8b790e1c3efdcda4bd0952214ee31ad7ce5e91206ecf9097bf
+DIST rust-1.88.0_beta20250526-loongarch64-unknown-linux-gnu.tar.xz 261384104 BLAKE2B 661882ea84aec6dde3cf938ba61229bb38d8a745832dae4025965241f61d8a4879a8e727ba35d0a000694bd4ca560f6b2491a3a4213569004f5bdb310be4de10 SHA512 a5b78599ba01a822b1f59f2ce98f5294d968522ac2263cd6a71b08b6dd74fcfe443ac530332b9d67a9555ba7bb0ffef5375c98b1f8f7e6ba0a95e41145aad899
+DIST rust-1.88.0_beta20250526-loongarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B d4807f009edf0b41134ba6a7a1fb78c0b0a4b38c7281c8808fd2bd0c3856820353414ea70eabdbe25064c4f0800b291e89247b64d83477702ace2feac0e8a9ec SHA512 b04d928325c3c70912db1a434c6df49101b8bcc379f60e2f8d85de032f1caba10abe2f073d513c4bdd4878bf6ee46022599f65a3c2a134a8cba2f84cf29fd0e8
+DIST rust-1.88.0_beta20250526-powerpc-unknown-linux-gnu.tar.xz 255492828 BLAKE2B 47c1acdf66909a547e3db24ce75ece26745cf40237c6695276683bddc33192508cba12f9dce100f762979e92648c58531de5293c0f73ff43b4141d5ad0e7ce49 SHA512 7901e970db1780bb10b92610738a22ddb6e0dd89403391ecaa395038971d3b290dcd3b77f1c727eb0ac9f011b4f153ceacc24bb8a5afb78ecd73ab1686c0ee14
+DIST rust-1.88.0_beta20250526-powerpc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 00680f8b37b644078d4d4e97ce4075648fef1e1758418623d489032d6f41a194a453328e46d8ca3fa1e451a17bb8687e347b5ae73595c71487adc97c3d1618f3 SHA512 813ca054248bebc85b1f1daa637e1623604f7facf86ed493f12f97dee6f979d738245ddb58b6feb6ac10f24ae06810f3fa460439202f6551ccd303bc94e1f554
+DIST rust-1.88.0_beta20250526-powerpc64-unknown-linux-gnu.tar.xz 255634308 BLAKE2B 8344bc5d3879d8ea1332ae8e3a6740dad295d8f7e5ed37c38f7bf4cc980ce79ca71e9f0ac980594b0664b4d15feaf79f9193b81fba1fc9baa71cab36c6eaa650 SHA512 e41070dab0420c4a86db50df549e8d09417fd224db0f8873ea39d3ced970f4312ca074cf4d5adb6ebd70eae76ac70f8103621da86fc22bb4e64d8fb70bc2f56b
+DIST rust-1.88.0_beta20250526-powerpc64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B fff2551661e8ff90a0fdc394c59bd6cd1c56eeb0062b5059b1555febc8ff82c964802a9273ca1f50b189bfd9aecb356fb6d6978421a75cb32de0ee070ad63000 SHA512 282420dd4e850a5bc2659ab1f34e7cbf50e0f3c16967019bba8d679af83d4b66d920ead46223d1f2cd2f0ed31c7db8beeb10d75d1e33bce844aec7d0f35d7e8a
+DIST rust-1.88.0_beta20250526-powerpc64le-unknown-linux-gnu.tar.xz 270308004 BLAKE2B 521d954e0a8ddec0be99d17a1dee9918dd093ec87c9b4069f84d56d810916464296e8dc03df8604628c82afe418b26d61b8907c36cad89eff88262fa6156fa0b SHA512 df8926047e649e4a3d7f98fcb609facfec3ed4aad820b401dd028eca84ddaa3cf968b79185dadc37cb16e0a88e4caff09123fd5be7200cd0a019d4cbe95813b9
+DIST rust-1.88.0_beta20250526-powerpc64le-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 1ec1fa77a2ea0a0917c4ae45d32f656b56d0f287d7aeb8d433987b940f55516707d9b473a7d95f4ef2bb19afe5bbd836ab96594a48500554198877d55ea5c762 SHA512 f3021119ce42f1edde18bcd7be8b177a6f0b288b3bbe6fa497863f29e62ca0407cace6f58760bb1e2ada49e5846404f12a7351da54724f9d86924999ef7e7cf7
+DIST rust-1.88.0_beta20250526-riscv64gc-unknown-linux-gnu.tar.xz 250149844 BLAKE2B 5a560e6c36cdaaf4598d1333e5c24f356df29d412edc3a0158184fef11dc0862f1c86aa3bb13eaea12db701092d2d5c49e598ced045679228a0e9df8ec0000e5 SHA512 c1ee83f099fdb3e548e1bf6237571509930f43e0dc02d889ae79f938a8c577eff939a2952f9c37ac10e14e3aa8067c23f229290c09c87c7af572c670fcbbcc53
+DIST rust-1.88.0_beta20250526-riscv64gc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B f68833da766ea88adf9f8a10ccbf7e0fdbe8c5c7e1b8d5e8fe5c43b01b261d92e6dabe086764564c6171b24d54ea7e0259412f9975ba5abb732d525af0ee6071 SHA512 a76cbe0d25f7b1bc7aeb7f4f853399cf3f6fc974aa5aaa8f4d8a2168314ba289df26f045a143d7ff8c8021d69924e6983e174cb142ec5a9ade4c551b0320aee3
+DIST rust-1.88.0_beta20250526-s390x-unknown-linux-gnu.tar.xz 239803292 BLAKE2B fb85011c9d2229c12d684b0efe4427fd88a10adc41558091d1a5d78354f07af22b4e4fffba2ba9213fafe2229a08251e68c8439704c6e5705edead7d158f14c9 SHA512 39f8ee027b5fbf786597f160ff82f8c67ac0fa1992d81fb8176c4c1a3ab38d707b877b679d2ed03bfd577d4f8c60c40c737ff4856f75bf7fb2b8dcda2f78d765
+DIST rust-1.88.0_beta20250526-s390x-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B ef2d5870840cf3f68b0ff774ecd53e52155ee7d716fa92482b7c1bcddfc986fdc8056ce49f5af03f51a24ce239ba6812d5e87e5b0712f28f8adb18d70d54282d SHA512 8c0c7470170ef0b5111b1acd5044b9ea13f8828f0aaaa3483d808f6853d38d3d9e101dd22740c1ebf658727b409bf0f6c6db967456833a5f2365e4bbf21f971c
+DIST rust-1.88.0_beta20250526-x86_64-unknown-linux-gnu.tar.xz 197118828 BLAKE2B 7d7ded5b1db239cffe9b9c2f12e81ad33a9b577782512f4141c4444095f47bfd87e86a971aa3daeb0fe69b28cfb5d9f664e16a87b3c797fcc90700dbe9af533b SHA512 700329288c0295fa3b37c12c1160e46aeb042a5bb9764660f52dcee7012c14ab0454e4941ca9891873e8b918a9b47c969226b1bba058d24f599dcd4f0e397b45
+DIST rust-1.88.0_beta20250526-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B dc34f5079fbcc11b615c8f054b634930145648ce4c0659f1d51bcb8565dfc23dc887ddb5ed40c156f05bbcf32b78c11a212813541eb61b20c20e9aeee0dfebda SHA512 037173417bf760225c6397108f3d139badd8e00145c9b5a7e65177457abe2552001b9cf8bab79fd58a8b40aedf2d224de66c9dfaa9a119bb913713c06ffbea55
+DIST rust-1.88.0_beta20250526-x86_64-unknown-linux-musl.tar.xz 290943744 BLAKE2B 03068177cc6f5252360cbef4616966cbf2042e4e342175c7a8342524729c3f6c5da650b7ba9ea5544a5fe6433bc8ce87e45a814b838eefa8e1149e4306a82f7d SHA512 d579488256b24aec5a487296f1929ca24e1e6f0da6dc5fc8298c0372b9f25dc988525bb9e3f66d79297e80ba792825d4d39f163f310b3f94540dd299c680be3d
+DIST rust-1.88.0_beta20250526-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 9b54bb5932d09b34abedf1448cf90cac011d2e7efa73f9f17df7815bd503ec3f992946dffc9309edc53e1b5b17d8a1c10759cc60ca41334734ae17c75e6a5f50 SHA512 22f38ac6bbf6fda213928c09f89ec2683743ad73b89b24cfc903bdc7243ac954a45fa735c125a1915c5d8f19c0761ca9dc41221791688ac343282034af0cdd90
 DIST rust-src-1.74.1.tar.xz 2544036 BLAKE2B d95431b69f102782f51878ff73ce8802cac6dab7909497c3231d1c479b95dc2a618cc6efd8bac9c6bd59a2b10dc6be05199f1e1bd74e45cc640ee52352c29268 SHA512 11467d0936193c5a5be8c2eba1aefe2b7028af48494698863de2c4057d68ce33dcee1fc66dc2d68b1d32f0202ce49e9b906727849de8f8d904dd07930e76d5a4
 DIST rust-src-1.75.0.tar.xz 2570256 BLAKE2B 9db7ccff07ffe6991233e9f530321fd6ba48c561dcf1226537afa70c7d045421d8e83c5300b0866ec6fccfaae96dd67b9f204e9e0e12108c0c766d467cd78909 SHA512 e7565cea2f1658a05237a698e38880df2544319b41b6d8b0805db5f1f94fd3bb4f986967d0440fcdfe3a135e33246f3c747665b964f57ff5942f56133af78cdd
 DIST rust-src-1.76.0.tar.xz 2590884 BLAKE2B d1a6215dab34d7b10c3177d2b248f997d3a846388f3442567572880aa5c5bc51b56398f5d4dc32727cee7c9dbef494430d6534a76b66c4ae5ac4fed07266644d SHA512 39d2fe58fae8c8c5a6cb3fb1ef2a1c7548c018fef6ccea531659fdfecd68a4aa77125299d2cbe5b58e500337b4d074928318fa9ebce358af500d0ef27260e3ca
@@ -567,3 +595,4 @@ DIST rust-src-1.85.0.tar.xz 3036988 BLAKE2B b7281b23eef60cf052e1641a29915c02c590
 DIST rust-src-1.85.1.tar.xz 3036412 BLAKE2B f137ffcebd2d231d8b3dc5c9072f6afe39a071bc9608ac468bca364fafaa9c277b91e40da870a083c802cc13b9b876a548d7fa8ae67ad9552321a7412b7d8cd8 SHA512 d230cbb1daae3e2f5168abef94c5b99fb118c34a980f018d5df3e43f6ead4e0a17d6ea29bcfbcd0fb745e215f7a4d0282a99a714dba77b98a16254bb27c2d2ad
 DIST rust-src-1.86.0.tar.xz 3053544 BLAKE2B 2d1d8a4be4f9dc9355ce9a2d1599e0a57c5d1cb32f7b2eb413f6009dbce7d63db2533dc038cf50f5277a2d7bf4434f2076632c12a6fd33335ccf3a9f2ab685d1 SHA512 2818d94412bb0766ce53383932cd8ce96275a8e923f916c4bf7116fbcb7c2053cfb9714667add1a9d50b18366c973ba3ab4fe55d49c8abc8cc57656635c59f63
 DIST rust-src-1.87.0.tar.xz 3119800 BLAKE2B 6429eb419f17109537a2a5463b0c68f504b3cb0f55766e18f73cf053883b06eedc934ab4598756790cec147ff41c4eb30a807d2ce0b7e6af33310710fdc5a8c1 SHA512 9747c60268d772b7c6e7694260c0808d2b8a42028f5606499c81595d76f5bc32c9acf6b4b9aad168235f8fd77d980c56bc4afc3d40f5d0374b23d3e66e3de390
+DIST rust-src-1.88.0_beta20250526.tar.xz 3154796 BLAKE2B 9c4cfd252edce814ce8621d189f3a4aa16ba7a350ae9d28644bf56daba8422e7e9bde63394d89870b94a021e55eeb1986d16d1b57afb8a8990e67ea7e175502e SHA512 c0e7185791433bf79db118d01476e28201970505adfebb425c86d1fac766c61ef57ae69aed34d538aee235e62cd5b00de882f04b36f1f227d64beb276915d053
diff --git a/dev-lang/rust-bin/rust-bin-1.88.0_beta20250526.ebuild b/dev-lang/rust-bin/rust-bin-1.88.0_beta20250526.ebuild
new file mode 100644
index 0000000000000..ef8fe8615c5c7
--- /dev/null
+++ b/dev-lang/rust-bin/rust-bin-1.88.0_beta20250526.ebuild
@@ -0,0 +1,314 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+LLVM_COMPAT=( 20 )
+LLVM_OPTIONAL="yes"
+
+inherit edo llvm-r1 multilib prefix rust-toolchain verify-sig multilib-minimal optfeature
+
+if [[ ${PV} == *9999* ]]; then
+	# We need to fetch a tarball in src_unpack
+	PROPERTIES+=" live"
+elif [[ ${PV} == *beta* ]]; then
+	# curl -Ls static.rust-lang.org/dist/channel-rust-beta.toml | grep "xz_url.*rust-src"
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	RUST_TOOLCHAIN_BASEURL=https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/
+	SRC_URI="$(rust_all_arch_uris rust-beta rust-${PV})
+		rust-src? ( ${RUST_TOOLCHAIN_BASEURL%/}/rust-src-beta.tar.xz -> rust-src-${PV}.tar.xz )
+	"
+else
+	# curl -Ls static.rust-lang.org/dist/channel-rust-${PV}.toml | grep "xz_url.*rust-src"
+	SRC_URI="$(rust_all_arch_uris "${PV}")
+		rust-src? ( ${RUST_TOOLCHAIN_BASEURL%/}/2025-01-30/rust-src-${PV}.tar.xz )
+	"
+	KEYWORDS="~amd64 ~arm ~arm64 ~loong ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+fi
+
+GENTOO_BIN_BASEURI="https://github.com/projg2/rust-bootstrap/releases/download/${PVR}" # omit trailing slash
+
+DESCRIPTION="Systems programming language from Mozilla"
+HOMEPAGE="https://www.rust-lang.org/"
+
+if [[ ${PV} != *9999* && ${PV} != *beta* ]] ; then
+	# Keep this separate to allow easy commenting out if not yet built
+	SRC_URI+=" sparc? ( ${GENTOO_BIN_BASEURI}/rust-${PVR}-sparc64-unknown-linux-gnu.tar.xz ) "
+	SRC_URI+=" mips? (
+		abi_mips_o32? (
+			big-endian?  ( ${GENTOO_BIN_BASEURI}/rust-${PVR}-mips-unknown-linux-gnu.tar.xz )
+			!big-endian? ( ${GENTOO_BIN_BASEURI}/rust-${PVR}-mipsel-unknown-linux-gnu.tar.xz )
+		)
+		abi_mips_n64? (
+			big-endian?  ( ${GENTOO_BIN_BASEURI}/rust-${PVR}-mips64-unknown-linux-gnuabi64.tar.xz )
+			!big-endian? ( ${GENTOO_BIN_BASEURI}/rust-${PVR}-mips64el-unknown-linux-gnuabi64.tar.xz )
+		)
+	)"
+	SRC_URI+=" riscv? (
+		elibc_musl? ( ${GENTOO_BIN_BASEURI}/rust-${PVR}-riscv64gc-unknown-linux-musl.tar.xz )
+	)"
+	SRC_URI+=" ppc64? ( elibc_musl? (
+		big-endian?  ( ${GENTOO_BIN_BASEURI}/rust-${PVR}-powerpc64-unknown-linux-musl.tar.xz )
+		!big-endian? ( ${GENTOO_BIN_BASEURI}/rust-${PVR}-powerpc64le-unknown-linux-musl.tar.xz )
+	) )"
+fi
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD BSD-1 BSD-2 BSD-4"
+SLOT="${PV%%_*}" # Beta releases get to share the same SLOT as the eventual stable
+IUSE="big-endian clippy cpu_flags_x86_sse2 doc prefix rust-analyzer rust-src rustfmt"
+
+RDEPEND="
+	>=app-eselect/eselect-rust-20190311
+	dev-libs/openssl
+	sys-apps/lsb-release
+	|| (
+		llvm-runtimes/libgcc
+		sys-devel/gcc:*
+	)
+	!dev-lang/rust:stable
+	!dev-lang/rust-bin:stable
+"
+BDEPEND="
+	prefix? ( dev-util/patchelf )
+	verify-sig? ( sec-keys/openpgp-keys-rust )
+"
+[[ ${PV} == *9999* ]] && BDEPEND+=" net-misc/curl"
+
+REQUIRED_USE="x86? ( cpu_flags_x86_sse2 )"
+
+# stripping rust may break it (at least on x86_64)
+# https://github.com/rust-lang/rust/issues/112286
+RESTRICT="strip"
+
+QA_PREBUILT="
+	opt/rust-bin-${SLOT}/bin/.*
+	opt/rust-bin-${SLOT}/lib/.*.so*
+	opt/rust-bin-${SLOT}/libexec/.*
+	opt/rust-bin-${SLOT}/lib/rustlib/.*/bin/.*
+	opt/rust-bin-${SLOT}/lib/rustlib/.*/lib/.*
+"
+
+# An rmeta file is custom binary format that contains the metadata for the crate.
+# rmeta files do not support linking, since they do not contain compiled object files.
+# so we can safely silence the warning for this QA check.
+QA_EXECSTACK="opt/${PN}-${SLOT}/lib/rustlib/*/lib*.rlib:lib.rmeta"
+
+VERIFY_SIG_OPENPGP_KEY_PATH="/usr/share/openpgp-keys/rust.asc"
+
+src_unpack() {
+	if [[ ${PV} == *9999* ]]; then
+		# We need to fetch the latest nightly listing and get the apprapriate src_uri for our arch
+		local rust_bin_url rustc_src_url
+		# Cut down on webrequests by fetching the nightly toml once
+		curl -Ls static.rust-lang.org/dist/channel-rust-nightly.toml > "${WORKDIR}/channel-rust-nightly.toml" ||
+			die "Failed to fetch nightly revision info"
+		rustc_src_url=$(grep 'xz_url.*rust-src' "${WORKDIR}/channel-rust-nightly.toml" | cut -d '"' -f 2)
+		rust_bin_url=$(grep "xz_url.*rust-nightly-$(rust_abi)" "${WORKDIR}/channel-rust-nightly.toml" | cut -d '"' -f 2)
+		einfo "Using nightly Rust from: ${rust_bin_url}"
+
+		if use rust-src; then
+			einfo "Using nightly Rust-src from: ${rustc_src_url}"
+			# We need to fetch the rust-src tarball
+			einfo "Fetching nightly rust-src tarball ..."
+			curl --progress-bar -L "${rustc_src_url}" -o "${WORKDIR}/rust-src-${PV}.tar.xz" ||
+				die "Failed to fetch nightly rust-src tarball."
+			# no verify-sig here, just unpack it
+			tar -xf "${WORKDIR}/rust-src-${PV}.tar.xz" || die "Failed to unpack nightly rust-src tarball"
+		fi
+
+		einfo "Fetching nightly Rust tarball ..."
+		curl --progress-bar -L "${rust_bin_url}" -O || die "Failed to fetch nightly tarball"
+		if use verify-sig; then
+			einfo "Fetching nightly signature ..."
+			curl --progress-bar -L "${rust_bin_url}.asc" -O || die "Failed to fetch nightly signature"
+			verify-sig_verify_detached "${WORKDIR}/rust-nightly-$(rust_abi).tar.xz" \
+				"${WORKDIR}/rust-nightly-$(rust_abi).tar.xz.asc"
+		fi
+		tar -xf "${WORKDIR}/rust-nightly-$(rust_abi).tar.xz" || die "Failed to unpack nightly tarball"
+	else
+		# sadly rust-src tarball does not have corresponding .asc file
+		# so do partial verification
+		if use verify-sig; then
+			for f in ${A}; do
+				if [[ -f ${DISTDIR}/${f}.asc ]]; then
+					verify-sig_verify_detached "${DISTDIR}/${f}" "${DISTDIR}/${f}.asc"
+				fi
+			done
+		fi
+
+		default_src_unpack
+
+	fi
+	case ${PV} in
+		*9999*)
+			mv "${WORKDIR}/rust-nightly-$(rust_abi)" "${S}" || die
+			;;
+		*beta*)
+			mv "${WORKDIR}/rust-beta-$(rust_abi)" "${S}" || die
+			;;
+		*)
+			mv "${WORKDIR}/rust-${PV}-$(rust_abi)" "${S}" || die
+			;;
+	esac
+}
+
+patchelf_for_bin() {
+	local filetype=$(file -b ${1})
+	if [[ ${filetype} == *ELF*interpreter* ]]; then
+		einfo "${1}'s interpreter changed"
+		patchelf ${1} --set-interpreter ${2} || die
+	elif [[ ${filetype} == *script* ]]; then
+		hprefixify ${1}
+	fi
+}
+
+rust_native_abi_install() {
+	pushd "${S}" >/dev/null || die
+	local analysis="$(grep 'analysis' ./components || die "analysis not found in components")"
+	local std="$(grep 'std' ./components || die "std not found in components")"
+	local components=( "rustc" "cargo" "${std}" )
+	use doc && components+=( "rust-docs" )
+	use clippy && components+=( "clippy-preview" )
+	use rustfmt && components+=( "rustfmt-preview" )
+	use rust-analyzer && components+=( "rust-analyzer-preview" "${analysis}" )
+	# Rust component 'rust-src' is extracted from separate archive
+	if use rust-src; then
+		einfo "Combining rust and rust-src installers"
+		case ${PV} in
+			*9999*)
+				mv -v "${WORKDIR}/rust-src-nightly/rust-src" "${S}" || die
+				;;
+			*beta*)
+				mv -v "${WORKDIR}/rust-src-beta/rust-src" "${S}" || die
+				;;
+			*)
+				mv -v "${WORKDIR}/rust-src-${PV}/rust-src" "${S}" || die
+				;;
+		esac
+		echo rust-src >> ./components || die
+		components+=( "rust-src" )
+	fi
+	edo ./install.sh \
+		--components="$(IFS=,; echo "${components[*]}")" \
+		--disable-verify \
+		--prefix="${ED}/opt/rust-bin-${SLOT}" \
+		--mandir="${ED}/opt/rust-bin-${SLOT}/man" \
+		--disable-ldconfig
+
+	docompress /opt/${P}/man/
+
+	if use prefix; then
+		local interpreter=$(patchelf --print-interpreter "${EPREFIX}"/bin/bash)
+		ebegin "Changing interpreter to ${interpreter} for Gentoo prefix at ${ED}/opt/${SLOT}/bin"
+		find "${ED}/opt/${SLOT}/bin" -type f -print0 | \
+			while IFS=  read -r -d '' filename; do
+				patchelf_for_bin ${filename} ${interpreter} \; || die
+			done
+		eend $?
+	fi
+
+	local symlinks=(
+		cargo
+		rustc
+		rustdoc
+		rust-gdb
+		rust-gdbgui
+		rust-lldb
+	)
+
+	use clippy && symlinks+=( clippy-driver cargo-clippy )
+	use rustfmt && symlinks+=( rustfmt cargo-fmt )
+	use rust-analyzer && symlinks+=( rust-analyzer )
+
+	einfo "installing eselect-rust symlinks and paths"
+	local i
+	for i in "${symlinks[@]}"; do
+		# we need realpath on /usr/bin/* symlink return version-appended binary path.
+		# so /usr/bin/rustc should point to /opt/rust-bin-<ver>/bin/rustc-<ver>
+		local ver_i="${i}-bin-${SLOT}"
+		ln -v "${ED}/opt/rust-bin-${SLOT}/bin/${i}" "${ED}/opt/rust-bin-${SLOT}/bin/${ver_i}" || die
+		dosym -r "/opt/rust-bin-${SLOT}/bin/${ver_i}" "/usr/bin/${ver_i}"
+	done
+
+	# symlinks to switch components to active rust in eselect
+	dosym -r "/opt/rust-bin-${SLOT}/lib" "/usr/lib/rust/lib-bin-${SLOT}"
+	dosym -r "/opt/rust-bin-${SLOT}/man" "/usr/lib/rust/man-bin-${SLOT}"
+	dosym -r "/opt/rust-bin-${SLOT}/lib/rustlib" "/usr/lib/rustlib-bin-${SLOT}"
+	dosym -r "/opt/rust-bin-${SLOT}/share/doc/rust" "/usr/share/doc/rust-bin-${SLOT}"
+
+	# make all capital underscored variable
+	local CARGO_TRIPLET="$(rust_abi)"
+	CARGO_TRIPLET="${CARGO_TRIPLET//-/_}"
+	CARGO_TRIPLET="${CARGO_TRIPLET^^}"
+	cat <<-_EOF_ > "${T}/50${P}"
+		MANPATH="${EPREFIX}/usr/lib/rust/man-bin-${SLOT}"
+	$(usev elibc_musl "CARGO_TARGET_${CARGO_TRIPLET}_RUSTFLAGS=\"-C target-feature=-crt-static\"")
+	_EOF_
+	doenvd "${T}/50${P}"
+
+	# note: eselect-rust adds EROOT to all paths below
+	cat <<-_EOF_ > "${T}/provider-${PN}-${SLOT}"
+	/usr/bin/cargo
+	/usr/bin/rustdoc
+	/usr/bin/rust-gdb
+	/usr/bin/rust-gdbgui
+	/usr/bin/rust-lldb
+	/usr/lib/rustlib
+	/usr/lib/rust/lib
+	/usr/lib/rust/man
+	/usr/share/doc/rust
+	_EOF_
+
+	if use clippy; then
+		echo /usr/bin/clippy-driver >> "${T}/provider-${PN}-${SLOT}"
+		echo /usr/bin/cargo-clippy >> "${T}/provider-${PN}-${SLOT}"
+	fi
+	if use rustfmt; then
+		echo /usr/bin/rustfmt >> "${T}/provider-${PN}-${SLOT}"
+		echo /usr/bin/cargo-fmt >> "${T}/provider-${PN}-${SLOT}"
+	fi
+	if use rust-analyzer; then
+		echo /usr/bin/rust-analyzer >> "${T}/provider-${PN}-${SLOT}"
+	fi
+
+	insinto /etc/env.d/rust
+	doins "${T}/provider-${PN}-${SLOT}"
+	popd >/dev/null || die
+}
+
+multilib_src_install() {
+	if multilib_is_native_abi; then
+		rust_native_abi_install
+	else
+		local rust_target
+		rust_target="$(rust_abi $(get_abi_CHOST ${v##*.}))"
+		dodir "/opt/${P}/lib/rustlib"
+		cp -vr "${WORKDIR}/rust-${PV}-${rust_target}/rust-std-${rust_target}/lib/rustlib/${rust_target}"\
+			"${ED}/opt/${P}/lib/rustlib" || die
+	fi
+
+	# BUG: installs x86_64 binary on other arches
+	rm -f "${ED}/opt/${P}/lib/rustlib/"*/bin/rust-llvm-dwp || die
+}
+
+pkg_postinst() {
+	eselect rust update
+
+	if has_version dev-debug/gdb || has_version llvm-core/lldb; then
+		elog "Rust installs helper scripts for calling GDB and LLDB,"
+		elog "for convenience they are installed under /usr/bin/rust-{gdb,lldb}-${PV}."
+	fi
+
+	if has_version app-editors/emacs; then
+		optfeature "emacs support for rust" app-emacs/rust-mode
+	fi
+
+	if has_version app-editors/gvim || has_version app-editors/vim; then
+		optfeature "vim support for rust" app-vim/rust-vim
+	fi
+}
+
+pkg_postrm() {
+	eselect rust cleanup
+}
diff --git a/dev-lang/rust-bin/rust-bin-9999.ebuild b/dev-lang/rust-bin/rust-bin-9999.ebuild
index e00494d54b3bb..ef8fe8615c5c7 100644
--- a/dev-lang/rust-bin/rust-bin-9999.ebuild
+++ b/dev-lang/rust-bin/rust-bin-9999.ebuild
@@ -92,7 +92,7 @@ QA_PREBUILT="
 # An rmeta file is custom binary format that contains the metadata for the crate.
 # rmeta files do not support linking, since they do not contain compiled object files.
 # so we can safely silence the warning for this QA check.
-QA_EXECSTACK="opt/${P}/lib/rustlib/*/lib*.rlib:lib.rmeta"
+QA_EXECSTACK="opt/${PN}-${SLOT}/lib/rustlib/*/lib*.rlib:lib.rmeta"
 
 VERIFY_SIG_OPENPGP_KEY_PATH="/usr/share/openpgp-keys/rust.asc"
 
diff --git a/dev-lang/rust-common/Manifest b/dev-lang/rust-common/Manifest
index ab332c7a70c05..d394cc047891c 100644
--- a/dev-lang/rust-common/Manifest
+++ b/dev-lang/rust-common/Manifest
@@ -12,3 +12,5 @@ DIST rustc-1.86.0-src.tar.xz 275696736 BLAKE2B 9f33a710a3e567d92f56091920643f5ef
 DIST rustc-1.86.0-src.tar.xz.asc 801 BLAKE2B 3e10a3894c7eee68d37bc5707d797548119f830667e27e652a199d13633199713bd01bd0f41a5f2af3c682561903e36abe27b36ef78d9a1d65bdf485527d2c15 SHA512 0b74dab9ee56d0a08e26e9cd40f722e4d99de63ac678f969f0c54d50737074fb28e170db5a36ce2627ec332e5ce3bb8a92167aefbccff7c70e4cb057bc0a94ac
 DIST rustc-1.87.0-src.tar.xz 283604208 BLAKE2B 7ede723121ff8df3908674631ceaec75797d91ccd6f1df4afd7187878adbb8d99c9e8a3b11c6027703b2e8d06785299d93d8649f3eda7f356dd2a6734d99d05b SHA512 2ef08c9be45434401f916d54b3739f52d255f8a3a4ce05a717499250c2333eeaf601f1d18085b878c027c609f44da74d0151f5bfc2c9ae1e01166919a91a1d2b
 DIST rustc-1.87.0-src.tar.xz.asc 801 BLAKE2B c9740c03baedcd70defba3fd37831692adaf0e984ef6b11d259244330d044fcacf935e6dd76caf126848da0c40f38e5368c60e8aabed5d3c2655a61fdbdc7564 SHA512 ebc13374381839a997c63455b733fd2a7960b4fd497f19c29be948cce8bb59a31ddda5da54ca154c16f7de43dd1bacd6c6bd76f3b6b36c5b43f4cfaf1746b952
+DIST rustc-1.88.0_beta20250526-src.tar.xz 283223628 BLAKE2B 1c21853c0b7edcafd87713823888e04d336fb9c6cd373aa05218ae5d1ddc9c68b18c06dc27d059542ddfe91c0eb04cf523e4b3621b9bbbfad5d2f82e8d1cad1e SHA512 28f64ae8b1e907f7c4044d8a0148286f6e202677417ac3b4f2ce24ee9dba34369ba18d39e443cb982ee5f3b8afd94530580a62b8f5d5473954e976708f002357
+DIST rustc-1.88.0_beta20250526-src.tar.xz.asc 801 BLAKE2B a412d72e4e0f273f03f3fee41abe1aeda03f77339891469e994f3a6bde0cd3836a1da087d908e732e90cd3285743a4a3c728c718ad1dda5daf7cca9de3be2c52 SHA512 45f208555f8b2fd3b21ac4cdc8fd7a110dc53fedbbe8d11542f105c5c8657a628309c8ff4520eb2c740cf3e784bfea0f21832b71b19a356b1b99fc7d0f04f607
diff --git a/dev-lang/rust-common/rust-common-1.88.0_beta20250526.ebuild b/dev-lang/rust-common/rust-common-1.88.0_beta20250526.ebuild
new file mode 100644
index 0000000000000..223c50f26f330
--- /dev/null
+++ b/dev-lang/rust-common/rust-common-1.88.0_beta20250526.ebuild
@@ -0,0 +1,72 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/rust.asc
+inherit shell-completion verify-sig
+
+DESCRIPTION="Common files shared between multiple slots of Rust"
+HOMEPAGE="https://www.rust-lang.org/"
+
+if [[ ${PV} = *9999* ]]; then
+	inherit git-r3
+	# In case cargo is not in sync we'll fetch it as a submodule
+	# Nightly users will probably already have the repo cloned and up-to-date anyway.
+	EGIT_REPO_URI="https://github.com/rust-lang/rust.git"
+	EGIT_SUBMODULES=( "-*" "src/tools/cargo" )
+elif [[ ${PV} == *beta* ]]; then
+	# Identify the snapshot date of the beta release:
+	# curl -Ls static.rust-lang.org/dist/channel-rust-beta.toml | grep beta-src.tar.xz
+	MY_PV=beta
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	SRC_URI="https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz
+		verify-sig? ( https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz.asc
+			-> rustc-${PV}-src.tar.xz.asc )
+	"
+	S="${WORKDIR}/rustc-${MY_PV}-src"
+else
+	MY_PV=${PV}
+	SRC_URI="https://static.rust-lang.org/dist/rustc-${PV}-src.tar.xz
+		verify-sig? ( https://static.rust-lang.org/dist/rustc-${PV}-src.tar.xz.asc )
+	"
+	S="${WORKDIR}/rustc-${MY_PV}-src"
+	KEYWORDS="~amd64 ~arm ~arm64 ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86"
+fi
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD BSD-1 BSD-2 BSD-4"
+SLOT="0"
+
+# Legacy non-slotted versions bash completions will collide.
+RDEPEND="
+	!dev-lang/rust:stable
+	!dev-lang/rust-bin:stable
+"
+BDEPEND="verify-sig? ( sec-keys/openpgp-keys-rust )"
+
+src_unpack() {
+	if [[ ${PV} == *9999* ]]; then
+		git-r3_src_unpack
+	else
+		if use verify-sig ; then
+			verify-sig_verify_detached "${DISTDIR}"/rustc-${PV}-src.tar.xz "${DISTDIR}"/rustc-${PV}-src.tar.xz.asc
+		fi
+
+		# Avoid unpacking the whole tarball which would need check-reqs
+		tar -xf "${DISTDIR}"/rustc-${PV}-src.tar.xz "rustc-${MY_PV}-src/src/tools/cargo/src/etc/"{_cargo,cargo.bashcomp.sh} || die
+	fi
+}
+
+src_configure() {
+	:
+}
+
+src_compile() {
+	:
+}
+
+src_install() {
+	newbashcomp src/tools/cargo/src/etc/cargo.bashcomp.sh cargo
+	dozshcomp src/tools/cargo/src/etc/_cargo
+}
diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 2d3563cd8535e..85bc23dc6e114 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -1,3 +1,4 @@
+DIST rust-patches-1.88.0_beta20250526.tar.bz2 4073 BLAKE2B 4ae2fd9d87116ee6f779e60ffcbed16ef778fd4e87d4f6f8e2588348b7d0aa28de3627f8c2d43cef540b2422278d4018618c6f0da6936be03de68aba3420f5a4 SHA512 8f775901aff2c0da66c01e20c983ca965eddf38cd106d055b6e480e9ca73418abc416fe28215d4f700eb8cce52a90808c0513d23d495977ac19a3b5d82e109ff
 DIST rustc-1.74.1-src.tar.xz 155968724 BLAKE2B e05f2379ac94b286f85791a138e1928e5b5b5a7749f0981d82c40c2a12860f55bf96bb2f0e924e35a0f8b2447b13052d38adea909aaa3199105787bb5a4861b3 SHA512 14c7e7ed2f38ab60299d8c7d41d78f042b6b57ef822d577b5138e60bdde31cf141eccd4332a25bc5da3d58eb5313d63c1448b5dfe9e11b8055bb8ea133a9038d
 DIST rustc-1.74.1-src.tar.xz.asc 801 BLAKE2B ddf73175b164233babf31ca3a381b03e20c0f36d017c1d5f85d6ab11f0986d861ab23b11c061e6b2444ced70c3d6a494cc3de4ec86f0deb221a805491bd75420 SHA512 9a96ff9ba9a4e2af4e267b2ec126fc0675c78d0eb767703daa2f28491c3d85c2ab00fbd8584390bf658812ec6c4ab6c57e43b386db59fd505bd3134a8873a09e
 DIST rustc-1.75.0-src.tar.xz 159624388 BLAKE2B 8937b80585eddaa3e1f1ef948899d14a170308518c6fef9fe569560cdd870053776956743f796055f2119399b9ca6c0df12fedd789ae46324d071e5126c4e495 SHA512 7b0f25d91b1b5c317980fc88e059200bd43b56a70b445fbc72fb9b96e09775bfd3a98e9bd9d662af80f0ce3aef527c777ee82777e96ca876f47a972d63da8606
@@ -30,3 +31,5 @@ DIST rustc-1.86.0-src.tar.xz 275696736 BLAKE2B 9f33a710a3e567d92f56091920643f5ef
 DIST rustc-1.86.0-src.tar.xz.asc 801 BLAKE2B 3e10a3894c7eee68d37bc5707d797548119f830667e27e652a199d13633199713bd01bd0f41a5f2af3c682561903e36abe27b36ef78d9a1d65bdf485527d2c15 SHA512 0b74dab9ee56d0a08e26e9cd40f722e4d99de63ac678f969f0c54d50737074fb28e170db5a36ce2627ec332e5ce3bb8a92167aefbccff7c70e4cb057bc0a94ac
 DIST rustc-1.87.0-src.tar.xz 283604208 BLAKE2B 7ede723121ff8df3908674631ceaec75797d91ccd6f1df4afd7187878adbb8d99c9e8a3b11c6027703b2e8d06785299d93d8649f3eda7f356dd2a6734d99d05b SHA512 2ef08c9be45434401f916d54b3739f52d255f8a3a4ce05a717499250c2333eeaf601f1d18085b878c027c609f44da74d0151f5bfc2c9ae1e01166919a91a1d2b
 DIST rustc-1.87.0-src.tar.xz.asc 801 BLAKE2B c9740c03baedcd70defba3fd37831692adaf0e984ef6b11d259244330d044fcacf935e6dd76caf126848da0c40f38e5368c60e8aabed5d3c2655a61fdbdc7564 SHA512 ebc13374381839a997c63455b733fd2a7960b4fd497f19c29be948cce8bb59a31ddda5da54ca154c16f7de43dd1bacd6c6bd76f3b6b36c5b43f4cfaf1746b952
+DIST rustc-1.88.0_beta20250526-src.tar.xz 283223628 BLAKE2B 1c21853c0b7edcafd87713823888e04d336fb9c6cd373aa05218ae5d1ddc9c68b18c06dc27d059542ddfe91c0eb04cf523e4b3621b9bbbfad5d2f82e8d1cad1e SHA512 28f64ae8b1e907f7c4044d8a0148286f6e202677417ac3b4f2ce24ee9dba34369ba18d39e443cb982ee5f3b8afd94530580a62b8f5d5473954e976708f002357
+DIST rustc-1.88.0_beta20250526-src.tar.xz.asc 801 BLAKE2B a412d72e4e0f273f03f3fee41abe1aeda03f77339891469e994f3a6bde0cd3836a1da087d908e732e90cd3285743a4a3c728c718ad1dda5daf7cca9de3be2c52 SHA512 45f208555f8b2fd3b21ac4cdc8fd7a110dc53fedbbe8d11542f105c5c8657a628309c8ff4520eb2c740cf3e784bfea0f21832b71b19a356b1b99fc7d0f04f607
diff --git a/dev-lang/rust/rust-1.88.0_beta20250526.ebuild b/dev-lang/rust/rust-1.88.0_beta20250526.ebuild
new file mode 100644
index 0000000000000..d24136d20a539
--- /dev/null
+++ b/dev-lang/rust/rust-1.88.0_beta20250526.ebuild
@@ -0,0 +1,831 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+LLVM_COMPAT=( 20 )
+PYTHON_COMPAT=( python3_{10..14} )
+
+RUST_PATCH_VER=${PVR}
+
+RUST_MAX_VER=${PV%%_*}
+if [[ ${PV} == *9999* ]]; then
+	RUST_MIN_VER="1.88.0" # Update this as new `beta` releases come out.
+elif [[ ${PV} == *beta* ]]; then
+	RUST_MAX_VER="$(ver_cut 1).$(ver_cut 2).0"
+	RUST_MIN_VER="$(ver_cut 1).$(($(ver_cut 2) - 1)).0"
+else
+	RUST_MIN_VER="$(ver_cut 1).$(($(ver_cut 2) - 1)).0"
+fi
+
+inherit check-reqs estack flag-o-matic llvm-r1 multiprocessing optfeature \
+	multilib multilib-build python-any-r1 rust rust-toolchain toolchain-funcs verify-sig
+
+if [[ ${PV} = *9999* ]]; then
+	inherit git-r3
+elif [[ ${PV} == *beta* ]]; then
+	# Identify the snapshot date of the beta release:
+	# curl -Ls static.rust-lang.org/dist/channel-rust-beta.toml | grep beta-src.tar.xz
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	MY_P="rustc-beta"
+	SRC_URI="https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz
+		https://gitweb.gentoo.org/proj/rust-patches.git/snapshot/rust-patches-${RUST_PATCH_VER}.tar.bz2
+		verify-sig? ( https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz.asc
+			-> rustc-${PV}-src.tar.xz.asc )
+	"
+	S="${WORKDIR}/${MY_P}-src"
+else
+	MY_P="rustc-${PV}"
+	SRC_URI="https://static.rust-lang.org/dist/${MY_P}-src.tar.xz
+		https://gitweb.gentoo.org/proj/rust-patches.git/snapshot/rust-patches-${RUST_PATCH_VER}.tar.bz2
+		verify-sig? ( https://static.rust-lang.org/dist/${MY_P}-src.tar.xz.asc )
+	"
+	S="${WORKDIR}/${MY_P}-src"
+	KEYWORDS="~amd64 ~arm ~arm64 ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86"
+fi
+
+DESCRIPTION="Systems programming language originally developed by Mozilla"
+HOMEPAGE="https://www.rust-lang.org/"
+
+# keep in sync with llvm ebuild of the same version as bundled one.
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARC ARM AVR BPF CSKY DirectX Hexagon Lanai
+	LoongArch M68k Mips MSP430 NVPTX PowerPC RISCV Sparc SPIRV SystemZ VE
+	WebAssembly X86 XCore Xtensa )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/(-)?}
+
+# https://github.com/rust-lang/llvm-project/blob/rustc-1.84.0/llvm/CMakeLists.txt
+_ALL_RUST_EXPERIMENTAL_TARGETS=( ARC CSKY DirectX M68k SPIRV Xtensa )
+declare -A ALL_RUST_EXPERIMENTAL_TARGETS
+for _x in "${_ALL_RUST_EXPERIMENTAL_TARGETS[@]}"; do
+	ALL_RUST_EXPERIMENTAL_TARGETS["llvm_targets_${_x}"]=0
+done
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD BSD-1 BSD-2 BSD-4"
+SLOT="${PV%%_*}" # Beta releases get to share the same SLOT as the eventual stable
+
+IUSE="big-endian clippy cpu_flags_x86_sse2 debug dist doc llvm-libunwind lto rustfmt rust-analyzer rust-src +system-llvm test wasm ${ALL_LLVM_TARGETS[*]}"
+
+if [[ ${PV} = *9999* ]]; then
+	# These USE flags require nightly rust
+	IUSE+=" miri"
+fi
+
+LLVM_DEPEND=()
+# splitting usedeps needed to avoid CI/pkgcheck's UncheckableDep limitation
+for _x in "${ALL_LLVM_TARGETS[@]}"; do
+	LLVM_DEPEND+=( "	${_x}? ( $(llvm_gen_dep "llvm-core/llvm:\${LLVM_SLOT}[${_x}]") )" )
+	if [[ -v ALL_RUST_EXPERIMENTAL_TARGETS["${_x}"] ]] ; then
+		ALL_RUST_EXPERIMENTAL_TARGETS["${_x}"]=1
+	fi
+done
+LLVM_DEPEND+=( "	wasm? ( $(llvm_gen_dep 'llvm-core/lld:${LLVM_SLOT}') )" )
+LLVM_DEPEND+=( "	$(llvm_gen_dep 'llvm-core/llvm:${LLVM_SLOT}')" )
+
+# dev-libs/oniguruma is used for documentation
+BDEPEND="${PYTHON_DEPS}
+	app-eselect/eselect-rust
+	dev-libs/oniguruma
+	|| (
+		>=sys-devel/gcc-4.7[cxx]
+		>=llvm-core/clang-3.5
+	)
+	lto? ( system-llvm? (
+		|| (
+			$(llvm_gen_dep 'llvm-core/lld:${LLVM_SLOT}')
+			sys-devel/mold
+		)
+	) )
+	!system-llvm? (
+		>=dev-build/cmake-3.13.4
+		app-alternatives/ninja
+	)
+	test? ( dev-debug/gdb )
+	verify-sig? ( sec-keys/openpgp-keys-rust )
+"
+
+DEPEND="
+	>=app-arch/xz-utils-5.2
+	net-misc/curl:=[http2,ssl]
+	sys-libs/zlib:=
+	dev-libs/openssl:0=
+	system-llvm? (
+		${LLVM_DEPEND[*]}
+		llvm-libunwind? ( llvm-runtimes/libunwind:= )
+	)
+	!system-llvm? (
+		!llvm-libunwind? (
+			elibc_musl? ( sys-libs/libunwind:= )
+		)
+	)
+"
+
+RDEPEND="${DEPEND}
+	app-eselect/eselect-rust
+	dev-lang/rust-common
+	sys-apps/lsb-release
+	!dev-lang/rust:stable
+	!dev-lang/rust-bin:stable
+"
+
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
+	rust-analyzer? ( rust-src )
+	test? ( ${ALL_LLVM_TARGETS[*]} )
+	wasm? ( llvm_targets_WebAssembly )
+	x86? ( cpu_flags_x86_sse2 )
+"
+
+# we don't use cmake.eclass, but can get a warning
+CMAKE_WARN_UNUSED_CLI=no
+
+QA_FLAGS_IGNORED="
+	usr/lib/${PN}/${SLOT}/bin/.*
+	usr/lib/${PN}/${SLOT}/libexec/.*
+	usr/lib/${PN}/${SLOT}/lib/lib.*.so
+	usr/lib/${PN}/${SLOT}/lib/rustlib/.*/bin/.*
+	usr/lib/${PN}/${SLOT}/lib/rustlib/.*/lib/lib.*.so
+"
+
+QA_SONAME="
+	usr/lib/${PN}/${SLOT}/lib/lib.*.so.*
+	usr/lib/${PN}/${SLOT}/lib/rustlib/.*/lib/lib.*.so
+"
+
+QA_PRESTRIPPED="
+	usr/lib/${PN}/${SLOT}/lib/rustlib/.*/bin/rust-llvm-dwp
+	usr/lib/${PN}/${SLOT}/lib/rustlib/.*/lib/self-contained/crtn.o
+"
+
+# An rmeta file is custom binary format that contains the metadata for the crate.
+# rmeta files do not support linking, since they do not contain compiled object files.
+# so we can safely silence the warning for this QA check.
+QA_EXECSTACK="usr/lib/${PN}/${SLOT}/lib/rustlib/*/lib*.rlib:lib.rmeta"
+
+# causes double bootstrap
+RESTRICT="test"
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/rust.asc
+
+clear_vendor_checksums() {
+	sed -i 's/\("files":{\)[^}]*/\1/' "vendor/${1}/.cargo-checksum.json" || die
+}
+
+toml_usex() {
+	usex "${1}" true false
+}
+
+rust_live_get_sources() {
+	EGIT_REPO_URI="
+		https://anongit.gentoo.org/git/proj/rust-patches.git
+	"
+	EGIT_CHECKOUT_DIR="${WORKDIR}/rust-patches-${RUST_PATCH_VER}"
+	git-r3_src_unpack
+
+	EGIT_REPO_URI="
+		https://github.com/rust-lang/rust.git
+	"
+	EGIT_SUBMODULES=(
+		"*"
+		"-src/gcc"
+	)
+	S="${WORKDIR}/rust"
+	EGIT_CHECKOUT_DIR="${S}"
+	git-r3_src_unpack
+}
+
+src_unpack() {
+	if [[ ${PV} == *9999* ]] ; then
+		rust_live_get_sources
+
+		# Vendor dependencies
+		mkdir "${S}/.cargo" || die # The vendor script has a check for .cargo/config{,.toml}
+		touch "${S}/.cargo/bootstrap.toml" || die
+		local rust_stage0_root="$(${RUSTC} --print sysroot || die "Can't determine rust's sysroot")"
+		# Configure vendor to use the portage-provided toolchain. This prevents it from
+		# attempting to fetch a `beta` toolchain from the internet.
+		cat <<- _EOF_ > "${T}/vendor-bootstrap.toml"
+			# Suppresses a warning about tracking changes which we don't care about.
+			change-id = "ignore"
+			[build]
+			build = "$(rust_abi "${CBUILD}")"
+			host = ["$(rust_abi "${CHOST}")"]
+			target = ["$(rust_abi "${CHOST}")"]
+			cargo = "${rust_stage0_root}/bin/cargo"
+			rustc = "${rust_stage0_root}/bin/rustc"
+			rustfmt = "${rust_stage0_root}/bin/rustfmt"
+		_EOF_
+		# We're using git sources so we need to run the Vendor script
+		# to ensure that all dependencies are present and up-to-date
+		mkdir "${S}/vendor" || die
+		# This also compiles the 'build helper', there's no way to avoid this.
+		${EPYTHON} "${S}"/x.py vendor -v --config="${T}"/vendor-bootstrap.toml -j$(makeopts_jobs) ||
+			die "Failed to vendor dependencies"
+		# TODO: This has to be generated somehow, this is from a 1.84.x tarball I had lying around.
+		cat <<- _EOF_ > "${S}/.cargo/config.toml"
+			[source.crates-io]
+			replace-with = "vendored-sources"
+
+			[source."git+https://github.com/rust-lang/team"]
+			git = "https://github.com/rust-lang/team"
+			replace-with = "vendored-sources"
+
+			[source.vendored-sources]
+			directory = "vendor"
+		_EOF_
+	else
+		verify-sig_src_unpack
+	fi
+}
+
+pre_build_checks() {
+	local M=9216
+	# multiply requirements by 1.3 if we are doing x86-multilib
+	if use amd64; then
+		M=$(( $(usex abi_x86_32 13 10) * ${M} / 10 ))
+	fi
+	M=$(( $(usex clippy 128 0) + ${M} ))
+	if [[ ${PV} == *9999* ]]; then
+		M=$(( $(usex miri 128 0) + ${M} ))
+	fi
+	M=$(( $(usex rustfmt 256 0) + ${M} ))
+	# add 2G if we compile llvm and 256M per llvm_target
+	if ! use system-llvm; then
+		M=$(( 2048 + ${M} ))
+		local ltarget
+		for ltarget in ${ALL_LLVM_TARGETS[@]}; do
+			M=$(( $(usex ${ltarget} 256 0) + ${M} ))
+		done
+	fi
+	M=$(( $(usex wasm 256 0) + ${M} ))
+	M=$(( $(usex debug 2 1) * ${M} ))
+	eshopts_push -s extglob
+	if is-flagq '-g?(gdb)?([1-9])'; then
+		M=$(( 15 * ${M} / 10 ))
+	fi
+	eshopts_pop
+	M=$(( $(usex doc 256 0) + ${M} ))
+	CHECKREQS_DISK_BUILD=${M}M check-reqs_pkg_${EBUILD_PHASE}
+}
+
+llvm_check_deps() {
+	has_version -r "llvm-core/llvm:${LLVM_SLOT}[${LLVM_TARGET_USEDEPS// /,}]"
+}
+
+# Is LLVM being linked against libc++?
+is_libcxx_linked() {
+	local code='#include <ciso646>
+#if defined(_LIBCPP_VERSION)
+	HAVE_LIBCXX
+#endif
+'
+	local out=$($(tc-getCXX) ${CXXFLAGS} ${CPPFLAGS} -x c++ -E -P - <<<"${code}") || return 1
+	[[ ${out} == *HAVE_LIBCXX* ]]
+}
+
+pkg_pretend() {
+	pre_build_checks
+}
+
+pkg_setup() {
+	pre_build_checks
+	python-any-r1_pkg_setup
+
+	export LIBGIT2_NO_PKG_CONFIG=1 #749381
+	if tc-is-cross-compiler; then
+		use system-llvm && die "USE=system-llvm not allowed when cross-compiling"
+		local cross_llvm_target="$(llvm_tuple_to_target "${CBUILD}")"
+		use "llvm_targets_${cross_llvm_target}" || \
+			die "Must enable LLVM_TARGETS=${cross_llvm_target} matching CBUILD=${CBUILD} when cross-compiling"
+	fi
+
+	rust_pkg_setup
+
+	if use system-llvm; then
+		llvm-r1_pkg_setup
+
+		local llvm_config="$(get_llvm_prefix)/bin/llvm-config"
+		export LLVM_LINK_SHARED=1
+		export RUSTFLAGS="${RUSTFLAGS} -Lnative=$("${llvm_config}" --libdir)"
+	fi
+}
+
+src_prepare() {
+	if [[ ${PV} = *9999* ]]; then
+		# We need to update / generate lockfiles for the workspace
+		${CARGO} generate-lockfile --offline || die "Failed to generate lockfiles"
+	fi
+
+	PATCHES=(
+		"${WORKDIR}/rust-patches-${RUST_PATCH_VER}/"
+	)
+
+	if use lto && tc-is-clang && ! tc-ld-is-lld && ! tc-ld-is-mold; then
+		export RUSTFLAGS+=" -C link-arg=-fuse-ld=lld"
+	fi
+
+	default
+}
+
+src_configure() {
+	if tc-is-cross-compiler; then
+		export PKG_CONFIG_ALLOW_CROSS=1
+		export PKG_CONFIG_PATH="${ESYSROOT}/usr/$(get_libdir)/pkgconfig"
+		export OPENSSL_INCLUDE_DIR="${ESYSROOT}/usr/include"
+		export OPENSSL_LIB_DIR="${ESYSROOT}/usr/$(get_libdir)"
+	fi
+
+	# Avoid bundled copies of libraries
+	export RUSTONIG_SYSTEM_LIBONIG=1
+	# Need to check if these can be optional
+	#export LIBSQLITE3_SYS_USE_PKG_CONFIG=1
+	#export LIBSSH2_SYS_USE_PKG_CONFIG=1
+
+	filter-lto # https://bugs.gentoo.org/862109 https://bugs.gentoo.org/866231
+
+	local rust_target="" rust_targets="" arch_cflags
+
+	# Collect rust target names to compile standard libs for all ABIs.
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_targets+=",\"$(rust_abi $(get_abi_CHOST ${v##*.}))\""
+	done
+	if use wasm; then
+		rust_targets+=",\"wasm32-unknown-unknown\""
+		if use system-llvm; then
+			# un-hardcode rust-lld linker for this target
+			# https://bugs.gentoo.org/715348
+			sed -i '/linker:/ s/rust-lld/wasm-ld/' compiler/rustc_target/src/spec/base/wasm.rs || die
+		fi
+	fi
+	rust_targets="${rust_targets#,}"
+
+	# cargo and rustdoc are mandatory and should always be included
+	local tools='"cargo","rustdoc"'
+	use clippy && tools+=',"clippy"'
+	use rustfmt && tools+=',"rustfmt"'
+	use rust-analyzer && tools+=',"rust-analyzer","rust-analyzer-proc-macro-srv"'
+	use rust-src && tools+=',"src"'
+
+	if [[ ${PV} == *9999* ]]; then
+		use miri && tools+=',"miri"'
+	fi
+
+	local rust_stage0_root="$(${RUSTC} --print sysroot || die "Can't determine rust's sysroot")"
+	# in case of prefix it will be already prefixed, as --print sysroot returns full path
+	[[ -d ${rust_stage0_root} ]] || die "${rust_stage0_root} is not a directory"
+
+	rust_target="$(rust_abi)"
+	rust_build="$(rust_abi "${CBUILD}")"
+	rust_host="$(rust_abi "${CHOST}")"
+
+	RUST_EXPERIMENTAL_TARGETS=()
+	for _x in "${!ALL_RUST_EXPERIMENTAL_TARGETS[@]}"; do
+		if [[ ${ALL_RUST_EXPERIMENTAL_TARGETS[${_x}]} == 1 ]] && use ${_x} ; then
+			RUST_EXPERIMENTAL_TARGETS+=( ${_x#llvm_targets_} )
+		fi
+	done
+	RUST_EXPERIMENTAL_TARGETS=${RUST_EXPERIMENTAL_TARGETS[@]}
+
+	local cm_btype="$(usex debug DEBUG RELEASE)"
+	local build_channel
+	local build_miri="false"
+	case "${PV}" in
+		*9999*)
+			build_channel="nightly"
+			;;
+		*beta*)
+			build_channel="beta"
+			;;
+		*)
+			build_channel="stable"
+			;;
+	esac
+	cat <<- _EOF_ > "${S}"/bootstrap.toml
+		# Suppresses a warning about tracking changes which we don't care about.
+		change-id = "ignore"
+		# https://github.com/rust-lang/rust/issues/135358 (bug #947897)
+		profile = "dist"
+		[llvm]
+		download-ci-llvm = false
+		optimize = $(toml_usex !debug)
+		release-debuginfo = $(toml_usex debug)
+		assertions = $(toml_usex debug)
+		ninja = true
+		targets = "${LLVM_TARGETS// /;}"
+		experimental-targets = "${RUST_EXPERIMENTAL_TARGETS// /;}"
+		link-shared = $(toml_usex system-llvm)
+		$(if is_libcxx_linked; then
+			# https://bugs.gentoo.org/732632
+			echo "use-libcxx = true"
+			echo "static-libstdcpp = false"
+		fi)
+		$(case "${rust_target}" in
+			i586-*-linux-*)
+				# https://github.com/rust-lang/rust/issues/93059
+				echo 'cflags = "-fcf-protection=none"'
+				echo 'cxxflags = "-fcf-protection=none"'
+				echo 'ldflags = "-fcf-protection=none"'
+				;;
+			*)
+				;;
+		esac)
+		enable-warnings = false
+		[llvm.build-config]
+		CMAKE_VERBOSE_MAKEFILE = "ON"
+		$(if ! tc-is-cross-compiler; then
+			# When cross-compiling, LLVM is compiled twice, once for host and
+			# once for target.  Unfortunately, this build configuration applies
+			# to both, which means any flags applicable to one target but not
+			# the other will break.  Conditionally disable respecting user
+			# flags when cross-compiling.
+			echo "CMAKE_C_FLAGS_${cm_btype} = \"${CFLAGS}\""
+			echo "CMAKE_CXX_FLAGS_${cm_btype} = \"${CXXFLAGS}\""
+			echo "CMAKE_EXE_LINKER_FLAGS_${cm_btype} = \"${LDFLAGS}\""
+			echo "CMAKE_MODULE_LINKER_FLAGS_${cm_btype} = \"${LDFLAGS}\""
+			echo "CMAKE_SHARED_LINKER_FLAGS_${cm_btype} = \"${LDFLAGS}\""
+			echo "CMAKE_STATIC_LINKER_FLAGS_${cm_btype} = \"${ARFLAGS}\""
+		fi)
+		[build]
+		build-stage = 2
+		test-stage = 2
+		build = "${rust_build}"
+		host = ["${rust_host}"]
+		target = [${rust_targets}]
+		cargo = "${rust_stage0_root}/bin/cargo"
+		rustc = "${rust_stage0_root}/bin/rustc"
+		rustfmt = "${rust_stage0_root}/bin/rustfmt"
+		docs = $(toml_usex doc)
+		compiler-docs = false
+		submodules = false
+		python = "${EPYTHON}"
+		locked-deps = true
+		vendor = true
+		extended = true
+		tools = [${tools}]
+		verbose = 2
+		sanitizers = false
+		profiler = true
+		cargo-native-static = false
+		[install]
+		prefix = "${EPREFIX}/usr/lib/${PN}/${SLOT}"
+		sysconfdir = "etc"
+		docdir = "share/doc/rust"
+		bindir = "bin"
+		libdir = "lib"
+		mandir = "share/man"
+		[rust]
+		# https://github.com/rust-lang/rust/issues/54872
+		codegen-units-std = 1
+		optimize = true
+		debug = $(toml_usex debug)
+		debug-assertions = $(toml_usex debug)
+		debug-assertions-std = $(toml_usex debug)
+		debuginfo-level = $(usex debug 2 0)
+		debuginfo-level-rustc = $(usex debug 2 0)
+		debuginfo-level-std = $(usex debug 2 0)
+		debuginfo-level-tools = $(usex debug 2 0)
+		debuginfo-level-tests = 0
+		backtrace = true
+		incremental = false
+		$(if ! tc-is-cross-compiler; then
+			echo "default-linker = \"${CHOST}-cc\""
+		fi)
+		channel = "${build_channel}"
+		description = "gentoo"
+		rpath = true
+		verbose-tests = true
+		optimize-tests = $(toml_usex !debug)
+		codegen-tests = true
+		omit-git-hash = false
+		dist-src = false
+		remap-debuginfo = true
+		lld = $(usex system-llvm false $(toml_usex wasm))
+		$(if use lto && tc-is-clang && ! tc-ld-is-mold; then
+			echo "use-lld = true"
+		fi)
+		# only deny warnings if doc+wasm are NOT requested, documenting stage0 wasm std fails without it
+		# https://github.com/rust-lang/rust/issues/74976
+		# https://github.com/rust-lang/rust/issues/76526
+		deny-warnings = $(usex wasm $(usex doc false true) true)
+		backtrace-on-ice = true
+		jemalloc = false
+		# See https://github.com/rust-lang/rust/issues/121124
+		lto = "$(usex lto thin off)"
+		[dist]
+		src-tarball = false
+		compression-formats = ["xz"]
+		compression-profile = "balanced"
+	_EOF_
+
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_target=$(rust_abi $(get_abi_CHOST ${v##*.}))
+		arch_cflags="$(get_abi_CFLAGS ${v##*.})"
+
+		export CFLAGS_${rust_target//-/_}="${arch_cflags}"
+
+		cat <<- _EOF_ >> "${S}"/bootstrap.toml
+			[target.${rust_target}]
+			ar = "$(tc-getAR)"
+			cc = "$(tc-getCC)"
+			cxx = "$(tc-getCXX)"
+			linker = "$(tc-getCC)"
+			ranlib = "$(tc-getRANLIB)"
+			llvm-libunwind = "$(usex llvm-libunwind $(usex system-llvm system in-tree) no)"
+		_EOF_
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/bootstrap.toml
+				llvm-config = "$(get_llvm_prefix)/bin/llvm-config"
+			_EOF_
+		fi
+		# by default librustc_target/spec/linux_musl_base.rs sets base.crt_static_default = true;
+		# but we patch it and set to false here as well
+		if use elibc_musl; then
+			cat <<- _EOF_ >> "${S}"/bootstrap.toml
+				crt-static = false
+				musl-root = "$($(tc-getCC) -print-sysroot)/usr"
+			_EOF_
+		fi
+	done
+	if use wasm; then
+		wasm_target="wasm32-unknown-unknown"
+		export CFLAGS_${wasm_target//-/_}="$(filter-flags '-mcpu*' '-march*' '-mtune*'; echo "$CFLAGS")"
+		cat <<- _EOF_ >> "${S}"/bootstrap.toml
+			[target.wasm32-unknown-unknown]
+			linker = "$(usex system-llvm lld rust-lld)"
+			# wasm target does not have profiler_builtins https://bugs.gentoo.org/848483
+			profiler = false
+		_EOF_
+	fi
+
+	if [[ -n ${I_KNOW_WHAT_I_AM_DOING_CROSS} ]]; then # whitespace intentionally shifted below
+	# experimental cross support
+	# discussion: https://bugs.gentoo.org/679878
+	# TODO: c*flags, clang, system-llvm, cargo.eclass target support
+	# it would be much better if we could split out stdlib
+	# complilation to separate ebuild and abuse CATEGORY to
+	# just install to /usr/lib/rustlib/<target>
+
+	# extra targets defined as a bash array
+	# spec format:  <LLVM target>:<rust-target>:<CTARGET>
+	# best place would be /etc/portage/env/dev-lang/rust
+	# Example:
+	# RUST_CROSS_TARGETS=(
+	#	"AArch64:aarch64-unknown-linux-gnu:aarch64-unknown-linux-gnu"
+	# )
+	# no extra hand holding is done, no target transformations, all
+	# values are passed as-is with just basic checks, so it's up to user to supply correct values
+	# valid rust targets can be obtained with
+	# 	rustc --print target-list
+	# matching cross toolchain has to be installed
+	# matching LLVM_TARGET has to be enabled for both rust and llvm (if using system one)
+	# only gcc toolchains installed with crossdev are checked for now.
+
+	# BUG: we can't pass host flags to cross compiler, so just filter for now
+	# BUG: this should be more fine-grained.
+	filter-flags '-mcpu=*' '-march=*' '-mtune=*'
+
+	local cross_target_spec
+	for cross_target_spec in "${RUST_CROSS_TARGETS[@]}";do
+		# extracts first element form <LLVM target>:<rust-target>:<CTARGET>
+		local cross_llvm_target="${cross_target_spec%%:*}"
+		# extracts toolchain triples, <rust-target>:<CTARGET>
+		local cross_triples="${cross_target_spec#*:}"
+		# extracts first element after before : separator
+		local cross_rust_target="${cross_triples%%:*}"
+		# extracts last element after : separator
+		local cross_toolchain="${cross_triples##*:}"
+		use llvm_targets_${cross_llvm_target} || die "need llvm_targets_${cross_llvm_target} target enabled"
+		command -v ${cross_toolchain}-gcc > /dev/null 2>&1 || die "need ${cross_toolchain} cross toolchain"
+
+		cat <<- _EOF_ >> "${S}"/bootstrap.toml
+			[target.${cross_rust_target}]
+			ar = "${cross_toolchain}-ar"
+			cc = "${cross_toolchain}-gcc"
+			cxx = "${cross_toolchain}-g++"
+			linker = "${cross_toolchain}-gcc"
+			ranlib = "${cross_toolchain}-ranlib"
+		_EOF_
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/bootstrap.toml
+				llvm-config = "$(get_llvm_prefix)/bin/llvm-config"
+			_EOF_
+		fi
+		if [[ "${cross_toolchain}" == *-musl* ]]; then
+			cat <<- _EOF_ >> "${S}"/bootstrap.toml
+				musl-root = "$(${cross_toolchain}-gcc -print-sysroot)/usr"
+			_EOF_
+		fi
+
+		# append cross target to "normal" target list
+		# example 'target = ["powerpc64le-unknown-linux-gnu"]'
+		# becomes 'target = ["powerpc64le-unknown-linux-gnu","aarch64-unknown-linux-gnu"]'
+
+		rust_targets="${rust_targets},\"${cross_rust_target}\""
+		sed -i "/^target = \[/ s#\[.*\]#\[${rust_targets}\]#" bootstrap.toml || die
+
+		ewarn
+		ewarn "Enabled ${cross_rust_target} rust target"
+		ewarn "Using ${cross_toolchain} cross toolchain"
+		ewarn
+		if ! has_version -b 'sys-devel/binutils[multitarget]' ; then
+			ewarn "'sys-devel/binutils[multitarget]' is not installed"
+			ewarn "'strip' will be unable to strip cross libraries"
+			ewarn "cross targets will be installed with full debug information"
+			ewarn "enable 'multitarget' USE flag for binutils to be able to strip object files"
+			ewarn
+			ewarn "Alternatively llvm-strip can be used, it supports stripping any target"
+			ewarn "define STRIP=\"llvm-strip\" to use it (experimental)"
+			ewarn
+		fi
+	done
+	fi # I_KNOW_WHAT_I_AM_DOING_CROSS
+
+	einfo "Rust configured with the following flags:"
+	echo
+	echo RUSTFLAGS="\"${RUSTFLAGS}\""
+	echo RUSTFLAGS_BOOTSTRAP="\"${RUSTFLAGS_BOOTSTRAP}\""
+	echo RUSTFLAGS_NOT_BOOTSTRAP="\"${RUSTFLAGS_NOT_BOOTSTRAP}\""
+	echo MAGIC_EXTRA_RUSTFLAGS="\"${MAGIC_EXTRA_RUSTFLAGS}\""
+	env | grep "CARGO_TARGET_.*_RUSTFLAGS="
+	env | grep "CFLAGS_.*"
+	echo
+	einfo "bootstrap.toml contents:"
+	cat "${S}"/bootstrap.toml || die
+	echo
+}
+
+src_compile() {
+	# -v will show invocations, -vv "very verbose" is overkill, -vvv "very very verbose" is insane
+	RUST_BACKTRACE=1 "${EPYTHON}" ./x.py build -v --config="${S}"/bootstrap.toml -j$(makeopts_jobs) || die
+}
+
+src_test() {
+	# https://rustc-dev-guide.rust-lang.org/tests/intro.html
+
+	# those are basic and codegen tests.
+	local tests=(
+		codegen
+		codegen-units
+		compile-fail
+		incremental
+		mir-opt
+		pretty
+		run-make
+	)
+
+	# fails if llvm is not built with ALL targets.
+	# and known to fail with system llvm sometimes.
+	use system-llvm || tests+=( assembly )
+
+	# fragile/expensive/less important tests
+	# or tests that require extra builds
+	# TODO: instead of skipping, just make some nonfatal.
+	if [[ ${ERUST_RUN_EXTRA_TESTS:-no} != no ]]; then
+		tests+=(
+			rustdoc
+			rustdoc-js
+			rustdoc-js-std
+			rustdoc-ui
+			run-make-fulldeps
+			ui
+			ui-fulldeps
+		)
+	fi
+
+	local i failed=()
+	einfo "rust_src_test: enabled tests ${tests[@]/#/src/test/}"
+	for i in "${tests[@]}"; do
+		local t="src/test/${i}"
+		einfo "rust_src_test: running ${t}"
+		if ! RUST_BACKTRACE=1 "${EPYTHON}" ./x.py test -vv --config="${S}"/bootstrap.toml \
+				-j$(makeopts_jobs) --no-doc --no-fail-fast "${t}"
+		then
+				failed+=( "${t}" )
+				eerror "rust_src_test: ${t} failed"
+		fi
+	done
+
+	if [[ ${#failed[@]} -ne 0 ]]; then
+		eerror "rust_src_test: failure summary: ${failed[@]}"
+		die "aborting due to test failures"
+	fi
+}
+
+src_install() {
+	DESTDIR="${D}" "${EPYTHON}" ./x.py install -v --config="${S}"/bootstrap.toml -j$(makeopts_jobs) || die
+
+	docompress /usr/lib/${PN}/${SLOT}/share/man/
+
+	# bug #689562, #689160
+	rm -v "${ED}/usr/lib/${PN}/${SLOT}/etc/bash_completion.d/cargo" || die
+	rmdir -v "${ED}/usr/lib/${PN}/${SLOT}"/etc{/bash_completion.d,} || die
+
+	local symlinks=(
+		cargo
+		rustc
+		rustdoc
+		rust-gdb
+		rust-gdbgui
+		rust-lldb
+	)
+
+	use clippy && symlinks+=( clippy-driver cargo-clippy )
+	if [[ ${PV} = *9999* ]]; then
+		use miri && symlinks+=( miri cargo-miri )
+	fi
+	use rustfmt && symlinks+=( rustfmt cargo-fmt )
+	use rust-analyzer && symlinks+=( rust-analyzer )
+
+	einfo "installing eselect-rust symlinks and paths: ${symlinks[@]}"
+	local i
+	for i in "${symlinks[@]}"; do
+		# we need realpath on /usr/bin/* symlink return version-appended binary path.
+		# so /usr/bin/rustc should point to /usr/lib/rust/<ver>/bin/rustc-<ver>
+		# need to fix eselect-rust to remove this hack.
+		local ver_i="${i}-${PV%%_*}"
+		if [[ -f "${ED}/usr/lib/${PN}/${SLOT}/bin/${i}" ]]; then
+			einfo "Installing ${i} symlink"
+			ln -v "${ED}/usr/lib/${PN}/${SLOT}/bin/${i}" "${ED}/usr/lib/${PN}/${SLOT}/bin/${ver_i}" || die
+		else
+			ewarn "${i} symlink requested, but source file not found"
+			ewarn "please report this"
+		fi
+		dosym "../lib/${PN}/${SLOT}/bin/${ver_i}" "/usr/bin/${ver_i}"
+	done
+
+	# symlinks to switch components to active rust in eselect
+	dosym "${SLOT}/lib" "/usr/lib/${PN}/lib-${SLOT}"
+	use rust-analyzer && dosym "${SLOT}/libexec" "/usr/lib/${PN}/libexec-${SLOT}"
+	dosym "${SLOT}/share/man" "/usr/lib/${PN}/man-${SLOT}"
+	dosym "rust/${SLOT}/lib/rustlib" "/usr/lib/rustlib-${SLOT}"
+	dosym "../../lib/${PN}/${SLOT}/share/doc/rust" "/usr/share/doc/${P}"
+
+	newenvd - "50${P}" <<-_EOF_
+		MANPATH="${EPREFIX}/usr/lib/rust/man-${SLOT}"
+	_EOF_
+
+	rm -rf "${ED}/usr/lib/${PN}/${SLOT}"/*.old || die
+	rm -rf "${ED}/usr/lib/${PN}/${SLOT}/bin"/*.old || die
+	rm -rf "${ED}/usr/lib/${PN}/${SLOT}/doc"/*.old || die
+
+	# note: eselect-rust adds EROOT to all paths below
+	cat <<-_EOF_ > "${T}/provider-${PN}-${SLOT}"
+		/usr/bin/cargo
+		/usr/bin/rustdoc
+		/usr/bin/rust-gdb
+		/usr/bin/rust-gdbgui
+		/usr/bin/rust-lldb
+		/usr/lib/rustlib
+		/usr/lib/rust/lib
+		/usr/lib/rust/man
+		/usr/share/doc/rust
+	_EOF_
+
+	if use clippy; then
+		echo /usr/bin/clippy-driver >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-clippy >> "${T}/provider-${P}"
+	fi
+	if [[ ${SLOT} == *9999* ]] && use miri; then
+		echo /usr/bin/miri >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-miri >> "${T}/provider-${P}"
+	fi
+	if use rustfmt; then
+		echo /usr/bin/rustfmt >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-fmt >> "${T}/provider-${P}"
+	fi
+	if use rust-analyzer; then
+		echo /usr/lib/rust/libexec >> "${T}/provider-${P}"
+		echo /usr/bin/rust-analyzer >> "${T}/provider-${P}"
+	fi
+
+	insinto /etc/env.d/rust
+	doins "${T}/provider-${PN}-${SLOT}"
+
+	if use dist; then
+		"${EPYTHON}" ./x.py dist -v --config="${S}"/bootstrap.toml -j$(makeopts_jobs) || die
+		insinto "/usr/lib/${PN}/${SLOT}/dist"
+		doins -r "${S}/build/dist/."
+	fi
+}
+
+pkg_postinst() {
+
+	eselect rust update
+
+	if has_version dev-debug/gdb || has_version llvm-core/lldb; then
+		elog "Rust installs helper scripts for calling GDB and LLDB,"
+		elog "for convenience they are installed under /usr/bin/rust-{gdb,lldb}-${PV}."
+	fi
+
+	if has_version app-editors/emacs; then
+		optfeature "emacs support for rust" app-emacs/rust-mode
+	fi
+
+	if has_version app-editors/gvim || has_version app-editors/vim; then
+		optfeature "vim support for rust" app-vim/rust-vim
+	fi
+}
+
+pkg_postrm() {
+	eselect rust cleanup
+}
diff --git a/dev-lang/rust/rust-9999.ebuild b/dev-lang/rust/rust-9999.ebuild
index 4b395498dc1b8..d24136d20a539 100644
--- a/dev-lang/rust/rust-9999.ebuild
+++ b/dev-lang/rust/rust-9999.ebuild
@@ -4,17 +4,15 @@
 EAPI=8
 
 LLVM_COMPAT=( 20 )
-PYTHON_COMPAT=( python3_{10..13} )
+PYTHON_COMPAT=( python3_{10..14} )
+
+RUST_PATCH_VER=${PVR}
 
 RUST_MAX_VER=${PV%%_*}
 if [[ ${PV} == *9999* ]]; then
-	RUST_MIN_VER="1.86.0" # Update this as new `beta` releases come out.
+	RUST_MIN_VER="1.88.0" # Update this as new `beta` releases come out.
 elif [[ ${PV} == *beta* ]]; then
-	# Enforce that `beta` is built from `stable`.
-	# While uncommon it is possible for feature changes within `beta` to result
-	# in an older snapshot being unable to build a newer one without modifying the sources.
-	# 'stable' releases should always be able to build a beta snapshot so just use those.
-	RUST_MAX_VER="$(ver_cut 1).$(($(ver_cut 2) - 1)).1"
+	RUST_MAX_VER="$(ver_cut 1).$(ver_cut 2).0"
 	RUST_MIN_VER="$(ver_cut 1).$(($(ver_cut 2) - 1)).0"
 else
 	RUST_MIN_VER="$(ver_cut 1).$(($(ver_cut 2) - 1)).0"
@@ -25,11 +23,6 @@ inherit check-reqs estack flag-o-matic llvm-r1 multiprocessing optfeature \
 
 if [[ ${PV} = *9999* ]]; then
 	inherit git-r3
-	EGIT_REPO_URI="https://github.com/rust-lang/rust.git"
-	EGIT_SUBMODULES=(
-		"*"
-		"-src/gcc"
-	)
 elif [[ ${PV} == *beta* ]]; then
 	# Identify the snapshot date of the beta release:
 	# curl -Ls static.rust-lang.org/dist/channel-rust-beta.toml | grep beta-src.tar.xz
@@ -37,6 +30,7 @@ elif [[ ${PV} == *beta* ]]; then
 	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
 	MY_P="rustc-beta"
 	SRC_URI="https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz
+		https://gitweb.gentoo.org/proj/rust-patches.git/snapshot/rust-patches-${RUST_PATCH_VER}.tar.bz2
 		verify-sig? ( https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz.asc
 			-> rustc-${PV}-src.tar.xz.asc )
 	"
@@ -44,6 +38,7 @@ elif [[ ${PV} == *beta* ]]; then
 else
 	MY_P="rustc-${PV}"
 	SRC_URI="https://static.rust-lang.org/dist/${MY_P}-src.tar.xz
+		https://gitweb.gentoo.org/proj/rust-patches.git/snapshot/rust-patches-${RUST_PATCH_VER}.tar.bz2
 		verify-sig? ( https://static.rust-lang.org/dist/${MY_P}-src.tar.xz.asc )
 	"
 	S="${WORKDIR}/${MY_P}-src"
@@ -70,7 +65,7 @@ done
 LICENSE="|| ( MIT Apache-2.0 ) BSD BSD-1 BSD-2 BSD-4"
 SLOT="${PV%%_*}" # Beta releases get to share the same SLOT as the eventual stable
 
-IUSE="big-endian clippy cpu_flags_x86_sse2 debug dist doc llvm-libunwind lto rustfmt rust-analyzer rust-src system-llvm test wasm ${ALL_LLVM_TARGETS[*]}"
+IUSE="big-endian clippy cpu_flags_x86_sse2 debug dist doc llvm-libunwind lto rustfmt rust-analyzer rust-src +system-llvm test wasm ${ALL_LLVM_TARGETS[*]}"
 
 if [[ ${PV} = *9999* ]]; then
 	# These USE flags require nightly rust
@@ -172,12 +167,6 @@ RESTRICT="test"
 
 VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/rust.asc
 
-PATCHES=(
-	"${FILESDIR}"/1.85.0-cross-compile-libz.patch
-	"${FILESDIR}"/1.85.0-musl-dynamic-linking.patch
-	"${FILESDIR}"/1.67.0-doc-wasm.patch
-)
-
 clear_vendor_checksums() {
 	sed -i 's/\("files":{\)[^}]*/\1/' "vendor/${1}/.cargo-checksum.json" || die
 }
@@ -186,17 +175,38 @@ toml_usex() {
 	usex "${1}" true false
 }
 
+rust_live_get_sources() {
+	EGIT_REPO_URI="
+		https://anongit.gentoo.org/git/proj/rust-patches.git
+	"
+	EGIT_CHECKOUT_DIR="${WORKDIR}/rust-patches-${RUST_PATCH_VER}"
+	git-r3_src_unpack
+
+	EGIT_REPO_URI="
+		https://github.com/rust-lang/rust.git
+	"
+	EGIT_SUBMODULES=(
+		"*"
+		"-src/gcc"
+	)
+	S="${WORKDIR}/rust"
+	EGIT_CHECKOUT_DIR="${S}"
+	git-r3_src_unpack
+}
+
 src_unpack() {
-	if [[ ${PV} = *9999* ]]; then
-		git-r3_src_unpack
+	if [[ ${PV} == *9999* ]] ; then
+		rust_live_get_sources
+
+		# Vendor dependencies
 		mkdir "${S}/.cargo" || die # The vendor script has a check for .cargo/config{,.toml}
-		touch "${S}/.cargo/config.toml" || die
+		touch "${S}/.cargo/bootstrap.toml" || die
 		local rust_stage0_root="$(${RUSTC} --print sysroot || die "Can't determine rust's sysroot")"
-		local rust_build=""
-		local rust_host=""
 		# Configure vendor to use the portage-provided toolchain. This prevents it from
 		# attempting to fetch a `beta` toolchain from the internet.
-		cat <<- _EOF_ > "${T}/vendor-config.toml"
+		cat <<- _EOF_ > "${T}/vendor-bootstrap.toml"
+			# Suppresses a warning about tracking changes which we don't care about.
+			change-id = "ignore"
 			[build]
 			build = "$(rust_abi "${CBUILD}")"
 			host = ["$(rust_abi "${CHOST}")"]
@@ -209,7 +219,7 @@ src_unpack() {
 		# to ensure that all dependencies are present and up-to-date
 		mkdir "${S}/vendor" || die
 		# This also compiles the 'build helper', there's no way to avoid this.
-		${EPYTHON} "${S}"/x.py vendor -vvv --config="${T}"/vendor-config.toml -j$(makeopts_jobs) ||
+		${EPYTHON} "${S}"/x.py vendor -v --config="${T}"/vendor-bootstrap.toml -j$(makeopts_jobs) ||
 			die "Failed to vendor dependencies"
 		# TODO: This has to be generated somehow, this is from a 1.84.x tarball I had lying around.
 		cat <<- _EOF_ > "${S}/.cargo/config.toml"
@@ -303,9 +313,13 @@ pkg_setup() {
 src_prepare() {
 	if [[ ${PV} = *9999* ]]; then
 		# We need to update / generate lockfiles for the workspace
-		${CARGO} generate-lockfile --offline
+		${CARGO} generate-lockfile --offline || die "Failed to generate lockfiles"
 	fi
 
+	PATCHES=(
+		"${WORKDIR}/rust-patches-${RUST_PATCH_VER}/"
+	)
+
 	if use lto && tc-is-clang && ! tc-ld-is-lld && ! tc-ld-is-mold; then
 		export RUSTFLAGS+=" -C link-arg=-fuse-ld=lld"
 	fi
@@ -386,7 +400,9 @@ src_configure() {
 			build_channel="stable"
 			;;
 	esac
-	cat <<- _EOF_ > "${S}"/config.toml
+	cat <<- _EOF_ > "${S}"/bootstrap.toml
+		# Suppresses a warning about tracking changes which we don't care about.
+		change-id = "ignore"
 		# https://github.com/rust-lang/rust/issues/135358 (bug #947897)
 		profile = "dist"
 		[llvm]
@@ -507,7 +523,7 @@ src_configure() {
 
 		export CFLAGS_${rust_target//-/_}="${arch_cflags}"
 
-		cat <<- _EOF_ >> "${S}"/config.toml
+		cat <<- _EOF_ >> "${S}"/bootstrap.toml
 			[target.${rust_target}]
 			ar = "$(tc-getAR)"
 			cc = "$(tc-getCC)"
@@ -517,14 +533,14 @@ src_configure() {
 			llvm-libunwind = "$(usex llvm-libunwind $(usex system-llvm system in-tree) no)"
 		_EOF_
 		if use system-llvm; then
-			cat <<- _EOF_ >> "${S}"/config.toml
+			cat <<- _EOF_ >> "${S}"/bootstrap.toml
 				llvm-config = "$(get_llvm_prefix)/bin/llvm-config"
 			_EOF_
 		fi
 		# by default librustc_target/spec/linux_musl_base.rs sets base.crt_static_default = true;
 		# but we patch it and set to false here as well
 		if use elibc_musl; then
-			cat <<- _EOF_ >> "${S}"/config.toml
+			cat <<- _EOF_ >> "${S}"/bootstrap.toml
 				crt-static = false
 				musl-root = "$($(tc-getCC) -print-sysroot)/usr"
 			_EOF_
@@ -533,7 +549,7 @@ src_configure() {
 	if use wasm; then
 		wasm_target="wasm32-unknown-unknown"
 		export CFLAGS_${wasm_target//-/_}="$(filter-flags '-mcpu*' '-march*' '-mtune*'; echo "$CFLAGS")"
-		cat <<- _EOF_ >> "${S}"/config.toml
+		cat <<- _EOF_ >> "${S}"/bootstrap.toml
 			[target.wasm32-unknown-unknown]
 			linker = "$(usex system-llvm lld rust-lld)"
 			# wasm target does not have profiler_builtins https://bugs.gentoo.org/848483
@@ -581,7 +597,7 @@ src_configure() {
 		use llvm_targets_${cross_llvm_target} || die "need llvm_targets_${cross_llvm_target} target enabled"
 		command -v ${cross_toolchain}-gcc > /dev/null 2>&1 || die "need ${cross_toolchain} cross toolchain"
 
-		cat <<- _EOF_ >> "${S}"/config.toml
+		cat <<- _EOF_ >> "${S}"/bootstrap.toml
 			[target.${cross_rust_target}]
 			ar = "${cross_toolchain}-ar"
 			cc = "${cross_toolchain}-gcc"
@@ -590,12 +606,12 @@ src_configure() {
 			ranlib = "${cross_toolchain}-ranlib"
 		_EOF_
 		if use system-llvm; then
-			cat <<- _EOF_ >> "${S}"/config.toml
+			cat <<- _EOF_ >> "${S}"/bootstrap.toml
 				llvm-config = "$(get_llvm_prefix)/bin/llvm-config"
 			_EOF_
 		fi
 		if [[ "${cross_toolchain}" == *-musl* ]]; then
-			cat <<- _EOF_ >> "${S}"/config.toml
+			cat <<- _EOF_ >> "${S}"/bootstrap.toml
 				musl-root = "$(${cross_toolchain}-gcc -print-sysroot)/usr"
 			_EOF_
 		fi
@@ -605,7 +621,7 @@ src_configure() {
 		# becomes 'target = ["powerpc64le-unknown-linux-gnu","aarch64-unknown-linux-gnu"]'
 
 		rust_targets="${rust_targets},\"${cross_rust_target}\""
-		sed -i "/^target = \[/ s#\[.*\]#\[${rust_targets}\]#" config.toml || die
+		sed -i "/^target = \[/ s#\[.*\]#\[${rust_targets}\]#" bootstrap.toml || die
 
 		ewarn
 		ewarn "Enabled ${cross_rust_target} rust target"
@@ -633,13 +649,14 @@ src_configure() {
 	env | grep "CARGO_TARGET_.*_RUSTFLAGS="
 	env | grep "CFLAGS_.*"
 	echo
-	einfo "config.toml contents:"
-	cat "${S}"/config.toml || die
+	einfo "bootstrap.toml contents:"
+	cat "${S}"/bootstrap.toml || die
 	echo
 }
 
 src_compile() {
-	RUST_BACKTRACE=1 "${EPYTHON}" ./x.py build -vvv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+	# -v will show invocations, -vv "very verbose" is overkill, -vvv "very very verbose" is insane
+	RUST_BACKTRACE=1 "${EPYTHON}" ./x.py build -v --config="${S}"/bootstrap.toml -j$(makeopts_jobs) || die
 }
 
 src_test() {
@@ -680,7 +697,7 @@ src_test() {
 	for i in "${tests[@]}"; do
 		local t="src/test/${i}"
 		einfo "rust_src_test: running ${t}"
-		if ! RUST_BACKTRACE=1 "${EPYTHON}" ./x.py test -vv --config="${S}"/config.toml \
+		if ! RUST_BACKTRACE=1 "${EPYTHON}" ./x.py test -vv --config="${S}"/bootstrap.toml \
 				-j$(makeopts_jobs) --no-doc --no-fail-fast "${t}"
 		then
 				failed+=( "${t}" )
@@ -695,7 +712,7 @@ src_test() {
 }
 
 src_install() {
-	DESTDIR="${D}" "${EPYTHON}" ./x.py install -vv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+	DESTDIR="${D}" "${EPYTHON}" ./x.py install -v --config="${S}"/bootstrap.toml -j$(makeopts_jobs) || die
 
 	docompress /usr/lib/${PN}/${SLOT}/share/man/
 
@@ -785,7 +802,7 @@ src_install() {
 	doins "${T}/provider-${PN}-${SLOT}"
 
 	if use dist; then
-		"${EPYTHON}" ./x.py dist -vv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+		"${EPYTHON}" ./x.py dist -v --config="${S}"/bootstrap.toml -j$(makeopts_jobs) || die
 		insinto "/usr/lib/${PN}/${SLOT}/dist"
 		doins -r "${S}/build/dist/."
 	fi
diff --git a/eclass/rust.eclass b/eclass/rust.eclass
index 2ab5b7dfe00db..183d5cd4efab4 100644
--- a/eclass/rust.eclass
+++ b/eclass/rust.eclass
@@ -68,6 +68,7 @@ fi
 # Definitive list of Rust slots and the associated LLVM slot, newest first.
 declare -A -g -r _RUST_LLVM_MAP=(
 	["9999"]=20
+	["1.88.0"]=20
 	["1.87.0"]=20
 	["1.86.0"]=19
 	["1.85.1"]=19
@@ -94,6 +95,7 @@ declare -A -g -r _RUST_LLVM_MAP=(
 # this array is used to store the Rust slots in a more convenient order for iteration.
 declare -a -g -r _RUST_SLOTS_ORDERED=(
 	"9999"
+	"1.88.0"
 	"1.87.0"
 	"1.86.0"
 	"1.85.1"
diff --git a/sys-devel/rust-std/Manifest b/sys-devel/rust-std/Manifest
index b154ef871ff70..1aa4ac937bcce 100644
--- a/sys-devel/rust-std/Manifest
+++ b/sys-devel/rust-std/Manifest
@@ -12,3 +12,5 @@ DIST rustc-1.85.1-src.tar.xz 274028992 BLAKE2B 1dddbbc0d14fe9551fd2eb59a47521ac7
 DIST rustc-1.86.0-src.tar.xz 275696736 BLAKE2B 9f33a710a3e567d92f56091920643f5ef2ddf2ad52acb5d9ee78496a7b5dbc10da5a51c72cf2a6f66d543a531d3138a49767c98501ae4e885e03988d2ccfbb59 SHA512 9ce195e24a03765f7163de16271e3d19d731d4b80fcc2bfd919106c9d42543eade018f712f6947ea3c6e57c6cb2e6841596aa668d608b8da15101a7da14f3097
 DIST rustc-1.87.0-src.tar.xz 283604208 BLAKE2B 7ede723121ff8df3908674631ceaec75797d91ccd6f1df4afd7187878adbb8d99c9e8a3b11c6027703b2e8d06785299d93d8649f3eda7f356dd2a6734d99d05b SHA512 2ef08c9be45434401f916d54b3739f52d255f8a3a4ce05a717499250c2333eeaf601f1d18085b878c027c609f44da74d0151f5bfc2c9ae1e01166919a91a1d2b
 DIST rustc-1.87.0-src.tar.xz.asc 801 BLAKE2B c9740c03baedcd70defba3fd37831692adaf0e984ef6b11d259244330d044fcacf935e6dd76caf126848da0c40f38e5368c60e8aabed5d3c2655a61fdbdc7564 SHA512 ebc13374381839a997c63455b733fd2a7960b4fd497f19c29be948cce8bb59a31ddda5da54ca154c16f7de43dd1bacd6c6bd76f3b6b36c5b43f4cfaf1746b952
+DIST rustc-1.88.0_beta20250526-src.tar.xz 283223628 BLAKE2B 1c21853c0b7edcafd87713823888e04d336fb9c6cd373aa05218ae5d1ddc9c68b18c06dc27d059542ddfe91c0eb04cf523e4b3621b9bbbfad5d2f82e8d1cad1e SHA512 28f64ae8b1e907f7c4044d8a0148286f6e202677417ac3b4f2ce24ee9dba34369ba18d39e443cb982ee5f3b8afd94530580a62b8f5d5473954e976708f002357
+DIST rustc-1.88.0_beta20250526-src.tar.xz.asc 801 BLAKE2B a412d72e4e0f273f03f3fee41abe1aeda03f77339891469e994f3a6bde0cd3836a1da087d908e732e90cd3285743a4a3c728c718ad1dda5daf7cca9de3be2c52 SHA512 45f208555f8b2fd3b21ac4cdc8fd7a110dc53fedbbe8d11542f105c5c8657a628309c8ff4520eb2c740cf3e784bfea0f21832b71b19a356b1b99fc7d0f04f607
diff --git a/sys-devel/rust-std/rust-std-1.88.0_beta20250526.ebuild b/sys-devel/rust-std/rust-std-1.88.0_beta20250526.ebuild
new file mode 100644
index 0000000000000..c99f248bd701b
--- /dev/null
+++ b/sys-devel/rust-std/rust-std-1.88.0_beta20250526.ebuild
@@ -0,0 +1,179 @@
+# Copyright 2020-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..13} )
+
+inherit edo flag-o-matic multiprocessing python-any-r1 rust-toolchain toolchain-funcs verify-sig
+
+DESCRIPTION="Rust standard library, standalone (for crossdev)"
+HOMEPAGE="https://www.rust-lang.org"
+
+if [[ ${PV} = *9999* ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/rust-lang/rust.git"
+	EGIT_SUBMODULES=(
+			"*"
+			"-src/gcc"
+	)
+elif [[ ${PV} == *beta* ]]; then
+	# Identify the snapshot date of the beta release:
+	# curl -Ls static.rust-lang.org/dist/channel-rust-beta.toml | grep beta-src.tar.xz
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	MY_P="rustc-beta"
+	SRC_URI="https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz
+			verify-sig? ( https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz.asc
+					-> rustc-${PV}-src.tar.xz.asc )
+	"
+	S="${WORKDIR}/${MY_P}-src"
+else
+	MY_P="rustc-${PV}"
+	SRC_URI="https://static.rust-lang.org/dist/${MY_P}-src.tar.xz
+			verify-sig? ( https://static.rust-lang.org/dist/${MY_P}-src.tar.xz.asc )
+	"
+	S="${WORKDIR}/${MY_P}-src"
+fi
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD-1 BSD-2 BSD-4"
+SLOT="stable/$(ver_cut 1-2)"
+# please do not keyword
+#KEYWORDS="" #nowarn
+IUSE="debug"
+
+BDEPEND="
+	${PYTHON_DEPS}
+	~dev-lang/rust-${PV}:=
+	verify-sig? ( sec-keys/openpgp-keys-rust )
+"
+DEPEND="||
+	(
+		>="${CATEGORY}"/gcc-4.7:*
+		>="${CATEGORY/sys-devel/llvm-core}"/clang-3.5:*
+	)
+"
+RDEPEND="${DEPEND}"
+
+# need full compiler to run tests
+RESTRICT="test"
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/rust.asc
+
+QA_FLAGS_IGNORED="usr/lib/rust/${PV}/rustlib/.*/lib/lib.*.so"
+
+#
+# The cross magic
+#
+export CTARGET=${CTARGET:-${CHOST}}
+if [[ ${CTARGET} == ${CHOST} ]] ; then
+	if [[ ${CATEGORY} == cross-* ]] ; then
+		export CTARGET=${CATEGORY#cross-}
+	fi
+fi
+
+is_cross() {
+	[[ ${CHOST} != ${CTARGET} ]]
+}
+
+toml_usex() {
+	usex "$1" true false
+}
+
+pkg_pretend() {
+	is_cross || die "${PN} should only be used for cross"
+}
+
+pkg_setup() {
+	python-any-r1_pkg_setup
+}
+
+src_prepare() {
+	default
+}
+
+src_configure() {
+	# do the great cleanup
+	strip-flags
+	filter-flags '-mcpu=*' '-march=*' '-mtune=*' '-m32' '-m64'
+	strip-unsupported-flags
+
+	local rust_root x
+	rust_root="$(rustc --print sysroot)"
+	rtarget="$(rust_abi ${CTARGET})"
+	rtarget="${ERUST_STD_RTARGET:-${rtarget}}" # some targets need to be custom.
+	rbuild="$(rust_abi ${CBUILD})"
+	rhost="$(rust_abi ${CHOST})"
+
+	echo
+	for x in CATEGORY rust_root rbuild rhost rtarget RUSTFLAGS CFLAGS CXXFLAGS LDFLAGS; do
+		einfo "$(printf '%10s' ${x^^}:) ${!x}"
+	done
+
+	cat <<- EOF > "${S}"/bootstrap.toml
+		[build]
+		build = "${rbuild}"
+		host = ["${rhost}"]
+		target = ["${rtarget}"]
+		cargo = "${rust_root}/bin/cargo"
+		rustc = "${rust_root}/bin/rustc"
+		submodules = false
+		python = "${EPYTHON}"
+		locked-deps = true
+		vendor = true
+		extended = true
+		verbose = 2
+		cargo-native-static = false
+		[install]
+		prefix = "${EPREFIX}/usr/lib/${PN}/${PV}"
+		sysconfdir = "etc"
+		docdir = "share/doc/rust"
+		bindir = "bin"
+		libdir = "lib"
+		mandir = "share/man"
+		[rust]
+		# https://github.com/rust-lang/rust/issues/54872
+		codegen-units-std = 1
+		optimize = true
+		debug = $(toml_usex debug)
+		debug-assertions = $(toml_usex debug)
+		debuginfo-level-rustc = 0
+		backtrace = true
+		incremental = false
+		default-linker = "$(tc-getCC)"
+		rpath = false
+		dist-src = false
+		remap-debuginfo = true
+		jemalloc = false
+		[dist]
+		src-tarball = false
+		[target.${rtarget}]
+		ar = "$(tc-getAR ${CTARGET})"
+		cc = "$(tc-getCC ${CTARGET})"
+		cxx = "$(tc-getCXX ${CTARGET})"
+		linker = "$(tc-getCC ${CTARGET})"
+		ranlib = "$(tc-getRANLIB ${CTARGET})"
+		$(usev elibc_musl 'crt-static = false')
+	EOF
+
+	einfo "${PN^} configured with the following settings:"
+	cat "${S}"/bootstrap.toml || die
+}
+
+src_compile() {
+	edo env RUST_BACKTRACE=1 \
+		"${EPYTHON}" ./x.py build -vv --config="${S}"/bootstrap.toml -j$(makeopts_jobs) \
+		library/std --stage 0
+}
+
+src_test() {
+	ewarn "${PN} can't run tests"
+}
+
+src_install() {
+	local rustlib="lib/rust/${PV}/lib/rustlib"
+	dodir "/usr/${rustlib}"
+	pushd "build/${rhost}/stage0-sysroot/lib/rustlib" > /dev/null || die
+	cp -pPRv "${rtarget}" "${ED}/usr/${rustlib}" || die
+	popd > /dev/null || die
+}