dev-lang/ada-bootstrap: new package, add 0_p2021

Split dev-lang/gnat-gpl into dev-lang/ada-bootstrap. This ebuild
was initially a clone of dev-lang/gnat-gpl-2021-r5 then had some
cleanups done, toolchain.eclass use removed, and simplified what it
configures/builds/installs.

As I mentioned in 799693623d, there were
two jobs left -- this fixes the first one: splitting dev-lang/gnat-gpl
into its own package which doesn't collide with sys-devel/gcc:10 and
also does the least possible work, not with lots of USE, etc.)

Some inspiration taken from sys-devel/bpf-toolchain. Considered
using the *-toolchain name again but given the purpose of this is *not*
just to avoid crossdev use but instead to bootstrap from a binary for Ada,
it didn't feel appropriate.

(Planned to do this anyway but the issue mentioned in
9732ef3475 pushed me to get on with it now.)

Later versions of ada-bootstrap will be our own binaries for both
newer GCC as a base (although this is mostly a nice-to-have and to keep
things building rather than it being essential, AFAIK) as well as more
importantly musl and other arch support.

For that future work, see https://bugs.gentoo.org/940471#c1 for a
suggestion from Luke A. Guest. That will be tracked in bug #940472.

Bug: https://bugs.gentoo.org/547358
Bug: https://bugs.gentoo.org/919667
Bug: https://bugs.gentoo.org/940472
Closes: https://bugs.gentoo.org/940471
Signed-off-by: Sam James <sam@gentoo.org>

dev-lang/ada-bootstrap/Manifest

@@ -0,0 +1,5 @@
+DIST gcc-10-2021-20210519-19A74-src.tar.gz 109157702 BLAKE2B 8ec307e4fde35c8726bc7b9702717329695bad928d5222a7bb691cce47500de31a60bcfcbb925129a57cb81d3d7ea92e60599aa7383d5358e63cc087b0482550 SHA512 2e2cc0ec9a3a82816a5d399d2db261c356e106b82a44efd54a1ac882b96549ab8de79c69858127c4397de6e9e9463ce6fb9994fc2e426e7d3d2f98d5efa2edb6
+DIST gcc-interface-10-2021-20210519-19A75-src.tar.gz 359085 BLAKE2B 75f941a7635f2880cc0192acb49d8e7f567baca7530fb981be14dc6cb1bf46fda0e3c043c8703cdbeeb242b548894e0bc6787adfff0f27198354d150e6e36386 SHA512 0251a93d20c59cc4705963438880fe265e2e0bb94a35b7ddaaf03e9efae60e044e585a2204d0773a46f17b3b774e4d0c73adf852f5d06ba17373d26ed580ca8d
+DIST gnat-2021-20210519-19A70-src.tar.gz 8765762 BLAKE2B ef48f54c6109566e37bfa5dee9262305d0529b3dfd333ee28bc4e66f4709a0673f673d742bc04deb15dc145404f7618d350dbdf3f2a7ab37c861e57d011946fa SHA512 3cb79be024fdd9b738d99ffc8e224d32bb382b5da2d02b97b2061a5ea58456f33d4564c92e224af2713ce15fd5481edd715e5b9a52abc74fdc142f27e103c201
+DIST gnat-gpl-2014-x86-linux-bin.tar.gz 233049287 BLAKE2B 2e8bab113f6a319533ec12fdf71c481f72aee227c22bd0cc42a53bd727b323caba1e7b6298053db8b4d3016236b31649b0b255f4ebcbb81a08a69f29f78f13fc SHA512 ac7f53fb4bd71b0e8fbd62abc45de76f7f8f2f405b80e9b60b4b65a6cef6ee98e3b06848e4b752af3c8268237e5a0529cf6145ebc5b33cd6e5cf4928d85f5be2
+DIST gnat-gpl-2014-x86_64-linux-bin.tar.gz 236253400 BLAKE2B c1db70db9442ba24688b8e323d5a02e2e9707ba1f02835ea551038d0a09aafede93a224091e5186f2f2a9d0f96144027af2184ee05ca1c19cc997a6cf3902df7 SHA512 5e40a251baac3d0ace78352956ca21a7d294d902d344a9ed7a8d376e900468c283721ebfb773adfedbf4d623ace02536505c0147815a0c1908933ad611ea085e

dev-lang/ada-bootstrap/ada-bootstrap-0_p2021.ebuild

@@ -0,0 +1,183 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+MYP=gcc-10-${PV##*_p}-20210519-19A74-src
+GNATDIR=gnat-${PV##*_p}-20210519-19A70-src
+INTFDIR=gcc-interface-10-${PV##*_p}-20210519-19A75-src
+BTSTRP_X86=gnat-gpl-2014-x86-linux-bin
+BTSTRP_AMD64=gnat-gpl-2014-x86_64-linux-bin
+BASE_URI=https://community.download.adacore.com/v1
+
+inherit flag-o-matic toolchain-funcs
+
+DESCRIPTION="GNAT Ada Compiler - GPL version"
+HOMEPAGE="http://libre.adacore.com/"
+SRC_URI="
+	${BASE_URI}/005d2b2eff627177986d2517eb31e1959bec6f3a?filename=${GNATDIR}.tar.gz
+		-> ${GNATDIR}.tar.gz
+	${BASE_URI}/44cd393be0b468cc253bf2cf9cf7804c993e7b5b?filename=${MYP}.tar.gz
+		-> ${MYP}.tar.gz
+	${BASE_URI}/8ace7d06e469d36d726cc8badb0ed78411e727f3?filename=${INTFDIR}.tar.gz
+		-> ${INTFDIR}.tar.gz
+	amd64? (
+		${BASE_URI}/6eb6eef6bb897e4c743a519bfebe0b1d6fc409c6?filename=${BTSTRP_AMD64}.tar.gz&rand=1193
+		-> ${BTSTRP_AMD64}.tar.gz
+	)
+	x86? (
+		${BASE_URI}/c5e9e6fdff5cb77ed90cf8c62536653e27c0bed6?filename=${BTSTRP_X86}.tar.gz&rand=436
+		-> ${BTSTRP_X86}.tar.gz
+	)
+"
+S="${WORKDIR}"/${MYP}
+
+LICENSE="GPL-2 GPL-3"
+SLOT="0" # TODO: slot based on GCC version used
+KEYWORDS="-* ~amd64 ~x86"
+RESTRICT="test"
+
+BDEPEND="sys-devel/binutils"
+
+pkg_pretend() {
+	if tc-is-clang; then
+		die "${P} does not build with clang. It is bootstrapped."
+	fi
+}
+
+src_prepare() {
+	local bundledchost
+	case ${ARCH} in
+		amd64)
+			BTSTRP=${BTSTRP_AMD64}
+			bundledchost="x86_64"
+			;;
+		x86)
+			BTSTRP=${BTSTRP_X86}
+			bundledchost="i686"
+			;;
+		*)
+			die "Unknown \${ARCH}=${ARCH}!"
+			;;
+	esac
+
+	local cleanup
+	for cleanup in as ld ; do
+		rm "${WORKDIR}"/${BTSTRP}/libexec/gcc/${bundledchost}-pc-linux-gnu/4.7.4/${cleanup} || die
+
+		ln -s "${BROOT}"/usr/bin/${CHOST}-${cleanup} \
+			"${WORKDIR}"/${BTSTRP}/libexec/gcc/${bundledchost}-pc-linux-gnu/4.7.4/${cleanup} || die
+	done
+
+	export GCC="${WORKDIR}"/${BTSTRP}/bin/gcc
+
+	gnatbase=$(basename ${GCC})
+	gnatpath=$(dirname ${GCC})
+	GNATMAKE=${gnatbase/gcc/gnatmake}
+	if [[ ${gnatpath} != "." ]] ; then
+		GNATMAKE="${gnatpath}/${GNATMAKE}"
+	fi
+
+	export CC=${GCC}
+	export CXX="${gnatbase/gcc/g++}"
+	export GNATBIND="${gnatbase/gcc/gnatbind}"
+	export GNATLINK="${gnatbase/gcc/gnatlink}"
+	export GNATLS="${gnatbase/gcc/gnatls}"
+	if [[ ${gnatpath} != "." ]] ; then
+		CXX="${gnatpath}/${CXX}"
+		GNATBIND="${gnatpath}/${GNATBIND}"
+		GNATLINK="${gnatpath}/${GNATLINK}"
+		GNATLS="${gnatpath}/${GNATLS}"
+	fi
+
+	mkdir bin || die
+	local tool
+	for tool in gnat{make,bind,link,ls} ; do
+		ln -s $(type -P ${tool^^}) bin/${tool} || die
+		ln -s $(type -P ${tool^^}) bin/${bundledchost}-pc-linux-gnu-${tool} || die
+	done
+	ln -s $(type -P ${GCC}) bin/gcc || die
+	ln -s $(type -P ${GCC}) bin/${bundledchost}-pc-linux-gnu-gcc || die
+	ln -s $(type -P ${CXX}) bin/g++ || die
+	ln -s $(type -P ${CXX}) bin/${bundledchost}-pc-linux-gnu-g++ || die
+
+	cd .. || die
+	mv ${GNATDIR}/src/ada ${MYP}/gcc/ || die
+	mv ${INTFDIR} ${MYP}/gcc/ada/gcc-interface || die
+	eapply "${FILESDIR}"/${P}-gentoo.patch
+	cd - || die
+
+	sed -i \
+		-e 's:-fcf-protection":":' \
+		libiberty/configure \
+		lto-plugin/configure || die
+	sed -i \
+		-e 's:$(P) ::g' \
+		gcc/ada/gcc-interface/Makefile.in \
+		|| die "sed failed"
+	default
+}
+
+src_configure() {
+	local adabdir=/usr/lib/${PN}
+	local prefix=${EPREFIX}${adabdir}
+	local -x PATH=${PWD}/bin:${PATH}
+
+	# This version is GCC 4.7.4 with a bolted-on newer GNAT; be very
+	# conservative, we just want it to build for bootstrapping proper
+	# sys-devel/gcc[ada]. We don't need it to be fast.
+	strip-flags
+	strip-unsupported-flags
+	filter-lto
+	append-flags -O2
+	append-flags -fno-strict-aliasing
+
+	local conf=(
+		--{doc,info,man}dir=/.skip # let the real gcc handle docs
+		MAKEINFO=: #922230
+		--prefix="${prefix}"
+		--disable-bootstrap
+		--disable-cc1
+		--disable-cet
+		--disable-gcov #843989
+		--disable-gomp
+		--disable-nls # filename collisions
+		--disable-libcc1
+		--disable-libquadmath
+		--disable-libsanitizer
+		--disable-libssp
+		--disable-libvtv
+		--disable-shared
+		--disable-werror
+		--enable-languages=ada
+		--with-gcc-major-version-only
+		--with-system-zlib
+		--without-isl
+		--without-zstd
+		--disable-multilib
+	)
+
+	# libstdc++ may misdetect sys/sdt.h on systemtap-enabled system and fail
+	# (not passed in conf_gcc above given it is lost in sub-configure calls)
+	local -x glibcxx_cv_sys_sdt_h=no
+
+	mkdir "${WORKDIR}"/build || die
+	cd "${WORKDIR}"/build
+	ECONF_SOURCE="${S}" econf "${conf[@]}"
+}
+
+src_compile() {
+	emake -C "${WORKDIR}"/build MAKEINFO=: V=1
+}
+
+src_install() {
+	# -j1 to match bug #906155, other packages may be fragile too
+	emake -C "${WORKDIR}"/build -j1 MAKEINFO=: V=1 DESTDIR="${D}" install
+
+	# Delete libdep.a, which has a colliding name and is useless for bpf,
+	# which does not make use of cross-library dependencies: the libdep.a
+	# for the native binutils will do.
+	rm -f "${ED}"/${adabdir}/lib/bfd-plugins/libdep.a || die
+}
+
+# TODO: pkg_postinst warning/log?

dev-lang/ada-bootstrap/files/ada-bootstrap-0_p2021-gentoo.patch

@@ -0,0 +1,72 @@
+--- a/gcc-10-2021-20210519-19A74-src/gcc/ada/osint.adb	2017-03-10 21:58:02.600710156 +0100
++++ b/gcc-10-2021-20210519-19A74-src/gcc/ada/osint.adb	2017-03-10 21:59:38.033983293 +0100
+@@ -2229,14 +2229,11 @@
+       for J in Start_Of_Prefix .. Name_Len - Prog'Length + 1 loop
+          if Name_Buffer (J .. J + Prog'Length - 1) = Prog then
+             End_Of_Prefix := J - 1;
++            Start_Of_Suffix := J + Prog'Length;
+             exit;
+          end if;
+       end loop;
+ 
+-      if End_Of_Prefix > 1 then
+-         Start_Of_Suffix := End_Of_Prefix + Prog'Length + 1;
+-      end if;
+-
+       --  Create the new program name
+ 
+       return new String'
+--- a/gcc-10-2021-20210519-19A74-src/config/cet.m4	2022-01-01 11:18:09.663425422 +0100
++++ b/gcc-10-2021-20210519-19A74-src/config/cet.m4	2022-01-01 11:18:14.809345911 +0100
+@@ -62,7 +62,6 @@
+   i[[34567]]86-*-linux* | x86_64-*-linux*)
+     may_have_cet=yes
+     save_CFLAGS="$CFLAGS"
+-    CFLAGS="$CFLAGS -fcf-protection"
+     case "$enable_cet" in
+       auto)
+ 	# Check if target supports multi-byte NOPs
+--- a/gcc-10-2021-20210519-19A74-src/libiberty/configure	2024-03-02 19:45:34.658271627 +0100
++++ b/gcc-10-2021-20210519-19A74-src/libiberty/configure	2024-03-02 19:54:48.013538533 +0100
+@@ -6709,6 +6709,9 @@
+   if test "$cross_compiling" = yes; then :
+   ac_cv_c_stack_direction=0
+ else
++  cat >>confdefs.h <<_ACEOF
++extern void exit(int status);
++_ACEOF
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+ find_stack_direction ()
+@@ -7539,6 +7542,11 @@
+   if test "$cross_compiling" = yes; then :
+   ac_cv_func_strncmp_works=yes
+ else
++  cat >>confdefs.h <<_ACEOF
++ extern long unsigned int strlen(const char *s);
++ extern char *strcpy(char *dst, const char *src);
++ extern int strncmp(const char *s1, const char *s2, long unsigned int n);
++_ACEOF
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+ 
+--- a/gcc-10-2021-20210519-19A74-src/libsanitizer/configure	2024-03-02 20:41:56.810707374 +0100
++++ b/gcc-10-2021-20210519-19A74-src/libsanitizer/configure	2024-03-02 20:43:00.189080219 +0100
+@@ -16073,6 +16073,7 @@
+     sanitizer_supported=no
+     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+ #include <sys/syscall.h>
++#include <unistd.h>
+ int
+ main ()
+--- a/gcc-10-2021-20210519-19A74-src/libgfortran/configure	2024-03-02 21:57:47.282939696 +0100
++++ b/gcc-10-2021-20210519-19A74-src/libgfortran/configure	2024-03-02 21:58:34.702446345 +0100
+@@ -26391,6 +26391,7 @@
+ #if HAVE_IEEEFP_H
+ # include <ieeefp.h>
+ #endif /* HAVE_IEEEFP_H */
++extern void fpsetmask(int);
+ int
+ main ()
+ {

dev-lang/ada-bootstrap/files/gcc-configure-texinfo.patch

@@ -0,0 +1,16 @@
+Chances are quite good that the installed makeinfo is sufficient.
+So ignore false positives where the makeinfo installed is so new
+that it violates the cheesy version grep.
+
+http://bugs.gentoo.org/198182
+
+--- a/configure
++++ b/configure
+@@ -3573,6 +3573,6 @@
+       :
+     else
+-      MAKEINFO="$MISSING makeinfo"
++      :
+     fi
+     ;;
+ 

dev-lang/ada-bootstrap/metadata.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>ada@gentoo.org</email>
+	</maintainer>
+</pkgmetadata>