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dev-lang/rust: Require clang when building WASM sysroot

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GCC does not support WASM. Require clang to build C code for WASM
target and make sure it's actually used.

[mgorny: added strip-unsupported-flags too]

Bug: https://bugs.gentoo.org/965346
Signed-off-by: Michal Rostecki <vadorovsky@protonmail.com>
Part-of: https://github.com/gentoo/gentoo/pull/44594
Closes: https://github.com/gentoo/gentoo/pull/44594
Signed-off-by: Michał Górny <mgorny@gentoo.org>
This commit is contained in:
Michal Rostecki
2025-11-11 14:19:40 +01:00
committed by Michał Górny
parent 668e8b50ef
commit 282749749d
2 changed files with 32 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
dev-lang/rust/rust-1.92.0_p1-r1.ebuild
View File

@@ -125,6 +125,7 @@ BDEPEND="
sys-devel/mold
)
) )
rust_sysroots_wasm? ( llvm-core/clang )
!system-llvm? (
>=dev-build/cmake-3.13.4
app-alternatives/ninja
@@ -587,9 +588,23 @@ src_configure() {
done
if use rust_sysroots_wasm; then
wasm_target="wasm32-unknown-unknown"
export CFLAGS_${wasm_target//-/_}="$(filter-flags '-mcpu*' '-march*' '-mtune*'; echo "$CFLAGS")"
if tc-is-clang; then
local wasm_cc=$(tc-getCC)
local wasm_cxx=$(tc-getCXX)
else
local wasm_cc=${CHOST}-clang
local wasm_cxx=${CHOST}-clang++
fi
export CFLAGS_${wasm_target//-/_}="$(
CC="${wasm_cc} --target=wasm32-unknown-unknown"
filter-flags '-mcpu*' '-march*' '-mtune*'
strip-unsupported-flags
echo "${CFLAGS}"
)"
cat <<- _EOF_ >> "${S}"/bootstrap.toml
[target.wasm32-unknown-unknown]
cc = "${wasm_cc}"
cxx = "${wasm_cxx}"
linker = "$(usex system-llvm lld rust-lld)"
# wasm target does not have profiler_builtins https://bugs.gentoo.org/848483
profiler = false

17
dev-lang/rust/rust-9999.ebuild
View File

@@ -125,6 +125,7 @@ BDEPEND="
sys-devel/mold
)
) )
rust_sysroots_wasm? ( llvm-core/clang )
!system-llvm? (
>=dev-build/cmake-3.13.4
app-alternatives/ninja
@@ -587,9 +588,23 @@ src_configure() {
done
if use rust_sysroots_wasm; then
wasm_target="wasm32-unknown-unknown"
export CFLAGS_${wasm_target//-/_}="$(filter-flags '-mcpu*' '-march*' '-mtune*'; echo "$CFLAGS")"
if tc-is-clang; then
local wasm_cc=$(tc-getCC)
local wasm_cxx=$(tc-getCXX)
else
local wasm_cc=${CHOST}-clang
local wasm_cxx=${CHOST}-clang++
fi
export CFLAGS_${wasm_target//-/_}="$(
CC="${wasm_cc} --target=wasm32-unknown-unknown"
filter-flags '-mcpu*' '-march*' '-mtune*'
strip-unsupported-flags
echo "${CFLAGS}"
)"
cat <<- _EOF_ >> "${S}"/bootstrap.toml
[target.wasm32-unknown-unknown]
cc = "${wasm_cc}"
cxx = "${wasm_cxx}"
linker = "$(usex system-llvm lld rust-lld)"
# wasm target does not have profiler_builtins https://bugs.gentoo.org/848483
profiler = false