clang
unvendor
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139 changed files with 8091 additions and 1178 deletions
157
06/using-nix/2b1-clang.nix
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157
06/using-nix/2b1-clang.nix
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{ fetchurl, mkDerivationStage2
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, stage1, static-gnumake, musl, intermediate-clang
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, linux-headers, cmake, python}:
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let
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source-tarball-llvm = fetchurl {
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# local = /downloads/llvm-project-17.0.1.src.tar.xz;
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url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-17.0.1/llvm-project-17.0.1.src.tar.xz";
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sha256 = "b0e42aafc01ece2ca2b42e3526f54bebc4b1f1dc8de6e34f46a0446a13e882b9";
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};
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in
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mkDerivationStage2 {
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name = "bootstrap-2b1-clang";
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buildInputPaths = [
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"${stage1.protobusybox}/bin"
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"${static-gnumake}/wrappers"
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"${cmake}/bin"
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"${python}/bin"
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# 2a9-intermediate-clang intentionally not added to $PATH
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# to prevent confusion
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];
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script = ''
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# Shared libs are not relinked on install. Instead, their rpath
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# is erased with RPATH_SET: `Set runtime path of
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# "/nix/store/.../lib/x86_64-unknown-linux-musl/libc++.so.1.0" to ""`
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# One (hacky) workaround to that is using a constant-len build-dir.
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build_dir=build-dir; expr "$(pwd)/$build_dir)" '<=' 128
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while ! echo "$(pwd)/$build_dir" | wc -c | grep -Fqx 128; do
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build_dir="$build_dir."
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done; expr "$(echo $(pwd)/$build_dir | wc -c)" '==' 128
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mkdir $build_dir; cd $build_dir
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export SHELL=${stage1.protobusybox}/bin/ash
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# llvm cmake configuration should pick up ccache automatically from PATH
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export PATH="$PATH:/ccache/bin"
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command -v ccache && USE_CCACHE=YES || USE_CCACHE=NO
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# prepare future sysroot:
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SYSROOT=$out/sysroot
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mkdir -p $SYSROOT/lib $SYSROOT/include
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ln -s ${musl}/lib/* $SYSROOT/lib/
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ln -s ${musl}/include/* $SYSROOT/include/
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# unpack:
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unpack ${source-tarball-llvm}
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# fixup:
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sed -i "s|COMMAND sh|COMMAND ${stage1.protobusybox}/bin/ash|" \
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llvm/cmake/modules/GetHostTriple.cmake clang/CMakeLists.txt
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echo 'echo x86_64-unknown-linux-musl' > llvm/cmake/config.guess
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LOADER=${musl}/lib/libc.so
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sed -i "s|/lib/ld-musl-\" + ArchName + \".so.1|$LOADER|" \
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clang/lib/Driver/ToolChains/Linux.cpp
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BEGINEND='const bool HasCRTBeginEndFiles'
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sed -i "s|$BEGINEND =|$BEGINEND = false; ''${BEGINEND}_unused =|" \
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clang/lib/Driver/ToolChains/Gnu.cpp
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REL_ORIGIN='_install_rpath \"\$ORIGIN/../lib''${LLVM_LIBDIR_SUFFIX}\"'
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sed -i "s|_install_rpath \"\\\\\$ORIGIN/..|_install_rpath \"$out|" \
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llvm/cmake/modules/AddLLVM.cmake
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sed -i 's|numShards = 32;|numShards = 1;|' lld/*/SyntheticSections.*
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sed -i 's|numShards = 256;|numShards = 1;|' lld/*/ICF.cpp
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sed -i 's|__FILE__|"__FILE__"|' \
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libcxx/src/verbose_abort.cpp \
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libcxxabi/src/abort_message.cpp \
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compiler-rt/lib/builtins/int_util.h
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sed -i 's|"@LLVM_SRC_ROOT@"|"REDACTED"|' \
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llvm/tools/llvm-config/BuildVariables.inc.in
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sed -i 's|"@LLVM_OBJ_ROOT@"|"REDACTED"|' \
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llvm/tools/llvm-config/BuildVariables.inc.in
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# figure out includes:
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EXTRA_INCL="$(pwd)/extra_includes"
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mkdir -p $EXTRA_INCL
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cp clang/lib/Headers/*intrin*.h $EXTRA_INCL/
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cp clang/lib/Headers/mm_malloc.h $EXTRA_INCL/
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[ -e $EXTRA_INCL/immintrin.h ]
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# configure:
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export LD_LIBRARY_PATH="${musl}/lib:${intermediate-clang}/lib"
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export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$(pwd)/build/lib" # libLLVM
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OPTS=""
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add_opt() {
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OPTS="$OPTS -D$1"
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}
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add_opt CMAKE_BUILD_TYPE=Release
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add_opt LLVM_OPTIMIZED_TABLEGEN=YES
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add_opt LLVM_CCACHE_BUILD=$USE_CCACHE
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add_opt DEFAULT_SYSROOT=$SYSROOT
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add_opt CMAKE_INSTALL_PREFIX=$out
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add_opt LLVM_INSTALL_BINUTILS_SYMLINKS=YES
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add_opt LLVM_INSTALL_CCTOOLS_SYMLINKS=YES
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add_opt CMAKE_INSTALL_DO_STRIP=YES
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add_opt LLVM_ENABLE_PER_TARGET_RUNTIME_DIR=YES
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add_opt LLVM_TARGET_ARCH=X86
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add_opt LLVM_TARGETS_TO_BUILD=Native
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add_opt LLVM_BUILTIN_TARGETS=x86_64-unknown-linux-musl
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add_opt LLVM_DEFAULT_TARGET_TRIPLE=x86_64-unknown-linux-musl
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add_opt LLVM_HOST_TRIPLE=x86_64-unknown-linux-musl
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add_opt COMPILER_RT_DEFAULT_TARGET_TRIPLE=x86_64-unknown-linux-musl
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add_opt LLVM_APPEND_VC_REV=NO
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add_opt LLVM_INCLUDE_TESTS=NO
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add_opt LLVM_INCLUDE_EXAMPLES=NO
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add_opt LLVM_INCLUDE_BENCHMARKS=NO
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add_opt LLVM_ENABLE_BACKTRACES=NO
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add_opt LLVM_ENABLE_EH=YES
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add_opt LLVM_ENABLE_RTTI=YES
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add_opt CLANG_ENABLE_ARCMT=NO
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add_opt CLANG_ENABLE_STATIC_ANALYZER=NO
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add_opt COMPILER_RT_BUILD_SANITIZERS=NO
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add_opt COMPILER_RT_BUILD_XRAY=NO
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add_opt COMPILER_RT_BUILD_LIBFUZZER=NO
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add_opt COMPILER_RT_BUILD_PROFILE=NO
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add_opt COMPILER_RT_BUILD_MEMPROF=NO
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add_opt COMPILER_RT_BUILD_ORC=NO
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add_opt COMPILER_RT_USE_BUILTINS_LIBRARY=YES
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add_opt CLANG_DEFAULT_CXX_STDLIB=libc++
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add_opt CLANG_DEFAULT_LINKER=lld
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add_opt CLANG_DEFAULT_RTLIB=compiler-rt
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add_opt LIBCXX_HAS_MUSL_LIBC=YES
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add_opt LIBCXX_USE_COMPILER_RT=YES
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add_opt LIBCXX_INCLUDE_BENCHMARKS=NO
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add_opt LIBCXX_CXX_ABI=libcxxabi
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add_opt LIBCXX_ADDITIONAL_COMPILE_FLAGS=-I${linux-headers}/include
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add_opt LIBCXXABI_USE_COMPILER_RT=YES
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add_opt LIBCXXABI_USE_LLVM_UNWINDER=YES
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add_opt LLVM_INSTALL_TOOLCHAIN_ONLY=YES
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add_opt LIBUNWIND_USE_COMPILER_RT=YES
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add_opt LLVM_ENABLE_THREADS=NO
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REWRITE="-ffile-prefix-map=$(pwd)=/builddir/"
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CFLAGS="--sysroot=$SYSROOT -I$EXTRA_INCL $REWRITE"
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LDFLAGS="-Wl,--dynamic-linker=$LOADER"
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cmake -S llvm -B build -G 'Unix Makefiles' \
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-DCMAKE_ASM_COMPILER=${intermediate-clang}/bin/clang \
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-DCMAKE_C_COMPILER=${intermediate-clang}/bin/clang \
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-DCMAKE_CXX_COMPILER=${intermediate-clang}/bin/clang++ \
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-DLLVM_ENABLE_PROJECTS='clang;lld' \
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-DLLVM_ENABLE_RUNTIMES='compiler-rt;libcxx;libcxxabi;libunwind' \
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-DCMAKE_C_FLAGS="$CFLAGS" \
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-DCMAKE_CXX_FLAGS="$CFLAGS" \
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-DCMAKE_C_LINK_FLAGS="$LDFLAGS" \
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-DCMAKE_CXX_LINK_FLAGS="$LDFLAGS" \
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-DLLVM_BUILD_LLVM_DYLIB=YES \
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-DLLVM_LINK_LLVM_DYLIB=YES \
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-DCLANG_LINK_LLVM_DYLIB=YES \
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$OPTS
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# build:
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make -C build -j $NPROC
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# install:
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make -C build install/strip
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ln -s $out/lib/x86_64-unknown-linux-musl/* $out/lib/
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mkdir -p $out/bin
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ln -s $out/bin/clang $out/bin/cc
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ln -s $out/bin/clang++ $out/bin/c++
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ln -s $out/bin/clang-cpp $out/bin/cpp
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ln -s $out/bin/lld $out/bin/ld
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# mix new stuff into sysroot:
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ln -s $out/lib/* $out/sysroot/lib/
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# check for build path leaks:
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( ! grep -rF $(pwd) $out )
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'';
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extra.allowedRequisites = [ "out" musl ];
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extra.allowedReferences = [ "out" musl ];
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}
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