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[Static SDK] Build clang before running the main build. #501

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Merged
merged 2 commits into from
Sep 23, 2025
Merged

[Static SDK] Build clang before running the main build. #501

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257d100
[Static SDK] Build clang before running the main build.
al45tair Sep 22, 2025
0f08135
[Static SDK] Turn off -Werror for BoringSSL.
al45tair Sep 22, 2025
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55 changes: 49 additions & 6 deletions swift-ci/sdks/static-linux/scripts/build.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -239,6 +239,8 @@ function run() {
"$@"
}

# -----------------------------------------------------------------------

header "Building CMake from source"

quiet_pushd ${source_dir}/swift-project/cmake
Expand All @@ -255,6 +257,8 @@ run export PATH="${build_dir}/cmake/install/bin:$PATH"
quiet_popd
run cmake --version

# -----------------------------------------------------------------------

header "Patching Musl"

echo -n "Patching Musl for locale support... "
Expand All @@ -268,6 +272,45 @@ else
exit 1
fi

# -----------------------------------------------------------------------

header "Patching BoringSSL"

echo -n "Patching BoringSSL to disable -Werror... "
sed -i.bak "s/-Werror //g" ${source_dir}/boringssl/CMakeLists.txt
echo "done"

# -----------------------------------------------------------------------

header "Building clang for host"

mkdir -p ${build_dir}/host/clang ${build_dir}/clang

run cmake -G Ninja -S ${source_dir}/swift-project/llvm-project/llvm \
-B ${build_dir}/host/clang \
Comment on lines +289 to +290
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@AnthonyLatsis AnthonyLatsis Sep 22, 2025 •
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Why does this work with the source dir being llvm-project/llvm instead of llvm-project/clang?

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It actually doesn't work with the source dir being llvm-project/clang (that's the first thing I tried). Using llvm rather than clang is actually what the instructions here say to do.

-DCMAKE_BUILD_TYPE=Release \
-DLLVM_ENABLE_PROJECTS="clang" \
-DLLVM_PARALLEL_LINK_JOBS=1 \
-DCMAKE_INSTALL_PREFIX=${build_dir}/clang

quiet_pushd ${build_dir}/host/clang
run ninja -j$parallel_jobs
quiet_popd

header "Installing clang for host"

quiet_pushd ${build_dir}/host/clang
run ninja -j$parallel_jobs install
quiet_popd

clang_dir=${build_dir}/clang

header "Clang version"

${clang_dir}/bin/clang --version

# -----------------------------------------------------------------------

for arch in $archs; do

# Fix architecture names
Expand All @@ -288,11 +331,11 @@ for arch in $archs; do
"${sdk_root}/usr/lib/swift_static"
ln -sf ../swift/clang "${sdk_root}/usr/lib/swift_static/clang"

clang_resource_dir=$(${swift_dir}/bin/clang -print-resource-dir)
clang_resource_dir=$(${clang_dir}/bin/clang -print-resource-dir)
cp -rT $clang_resource_dir/include $sdk_resource_dir/include

cc="${swift_dir}/bin/clang -target $triple -resource-dir ${sdk_resource_dir} --sysroot ${sdk_root}"
cxx="${swift_dir}/bin/clang++ -target $triple -resource-dir ${sdk_resource_dir} --sysroot ${sdk_root} -stdlib=libc++ -unwindlib=libunwind"
cc="${clang_dir}/bin/clang -target $triple -resource-dir ${sdk_resource_dir} --sysroot ${sdk_root}"
cxx="${clang_dir}/bin/clang++ -target $triple -resource-dir ${sdk_resource_dir} --sysroot ${sdk_root} -stdlib=libc++ -unwindlib=libunwind"
as="$cc"

# Creating this gets rid of a warning
Expand Down Expand Up @@ -406,9 +449,9 @@ set(CMAKE_SYSROOT ${sdk_root})
set(CMAKE_CROSSCOMPILING=YES)
set(CMAKE_EXE_LINKER_FLAGS "-unwindlib=libunwind -rtlib=compiler-rt -stdlib=libc++ -fuse-ld=lld -lc++ -lc++abi")

set(CMAKE_C_COMPILER ${swift_dir}/bin/clang -resource-dir ${sdk_resource_dir})
set(CMAKE_CXX_COMPILER ${swift_dir}/bin/clang++ -resource-dir ${sdk_resource_dir} -stdlib=libc++)
set(CMAKE_ASM_COMPILER ${swift_dir}/bin/clang -resource-dir ${sdk_resource_dir})
set(CMAKE_C_COMPILER ${clang_dir}/bin/clang -resource-dir ${sdk_resource_dir})
set(CMAKE_CXX_COMPILER ${clang_dir}/bin/clang++ -resource-dir ${sdk_resource_dir} -stdlib=libc++)
set(CMAKE_ASM_COMPILER ${clang_dir}/bin/clang -resource-dir ${sdk_resource_dir})
set(CMAKE_FIND_ROOT_PATH ${sdk_root})
EOF

Expand Down
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