--- /dev/null
+From 2ff1134d1d2b9f3c207e3ebd98de922f9ef6c15a Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@arm.com>
+Date: Wed, 24 Sep 2025 17:02:57 +0100
+Subject: [PATCH] [clang] Support building native tools when cross-compiling
+ standalone clang
+
+When cross-compiling the LLVM project as a whole (from llvm/), if it
+cannot find presupplied tools it will create a native build environment
+to build the tools it needs.
+
+However, when doing a standalone build of clang (that is, from clang/
+and linking against an existing libLLVM) this doesn't work. Instead
+a _target_ binary is built which predictably then fails.
+
+The conventional workaround for this is to build the native tools in a
+separate native compile phase and pass the paths to the cross build, for
+example see OpenEmbedded[1] or Nix[2]. But we can do better!
+
+The first problem is that LLVM_USE_HOST_TOOLS is only set in the llvm/
+CMakeLists.txt, so setup_host_tool() will never consider building a
+native binary. This can be solved by setting LLVM_USE_HOST_TOOLS based
+on CMAKE_CROSSCOMPILING in clang/CMakeLists.txt in the standalone case.
+
+Now setup_host_tool() will try to build a native tool, but it needs
+build_native_tool() from CrossCompile.cmake, so that also needs to be
+included.
+
+Finally, the native binary then fails because there's no provider for
+the dependency "CONFIGURE_Clang_NATIVE", so use llvm_create_cross_target
+to create the native environment.
+
+These few lines mirror what the lldb CMakeLists.txt does in the
+standalone case, so there is prior art for this.
+
+[1] https://git.openembedded.org/openembedded-core/tree/meta/recipes-devtools/clang/clang_git.bb?id=e18d697e92b55e57124e80234369d46575226386#n212
+[2] https://github.com/NixOS/nixpkgs/blob/3354d448f2a26117a74638957b0131ce3da9c8c4/pkgs/development/compilers/llvm/common/tblgen.nix#L54
+
+Upstream-Status: Submitted [https://github.com/llvm/llvm-project/pull/160605]
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+---
+ clang/CMakeLists.txt | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
+index 1bb73599970c..4eaa71289985 100644
+--- a/clang/CMakeLists.txt
++++ b/clang/CMakeLists.txt
+@@ -80,6 +80,12 @@ if(CLANG_BUILT_STANDALONE)
+ include(GetErrcMessages)
+ include(LLVMDistributionSupport)
+
++ if(CMAKE_CROSSCOMPILING)
++ set(LLVM_USE_HOST_TOOLS ON)
++ include(CrossCompile)
++ llvm_create_cross_target(Clang NATIVE "" Release)
++ endif()
++
+ set(PACKAGE_VERSION "${LLVM_PACKAGE_VERSION}")
+ set(BUG_REPORT_URL "${LLVM_PACKAGE_BUGREPORT}" CACHE STRING
+ "Default URL where bug reports are to be submitted.")
+--
+2.43.0
+
BPN = "clang"
-CVE_PRODUCT += "llvm:clang"
+CVE_PRODUCT = "llvm:clang"
INHIBIT_DEFAULT_DEPS:class-native = "1"
inherit cmake pkgconfig multilib_header python3-dir
-PACKAGECONFIG_CLANG_COMMON = "build-id eh libedit rtti shared-libs libclang-python \
- ${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-lld', 'lld', '', d)} \
- ${@bb.utils.contains('TC_CXX_RUNTIME', 'llvm', 'compiler-rt libcplusplus libomp unwindlib', '', d)} \
- "
-
-PACKAGECONFIG ??= "${PACKAGECONFIG_CLANG_COMMON} \
+PACKAGECONFIG ??= "build-id clangd libclang-python \
${@bb.utils.filter('DISTRO_FEATURES', 'lto thin-lto', d)} \
+ ${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-lld', 'lld', '', d)} \
+ ${@bb.utils.contains('TC_CXX_RUNTIME', 'llvm', 'compiler-rt libcplusplus libomp unwindlib', '', d)} \
"
-PACKAGECONFIG:class-native = "clangd \
- ${PACKAGECONFIG_CLANG_COMMON} \
- "
-PACKAGECONFIG:class-nativesdk = "clangd \
- ${PACKAGECONFIG_CLANG_COMMON} \
- ${@bb.utils.filter('DISTRO_FEATURES', 'lto thin-lto', d)} \
- "
+PACKAGECONFIG:remove:class-native = "lto thin-lto"
PACKAGECONFIG[build-id] = "-DENABLE_LINKER_BUILD_ID=ON,-DENABLE_LINKER_BUILD_ID=OFF,,"
PACKAGECONFIG[clangd] = "-DCLANG_ENABLE_CLANGD=ON,-DCLANG_ENABLE_CLANGD=OFF,,"
-
# Activate to build the dexp tool in clangd
# Disabled by default for -native since it is known to trigger compiler failure on Debian 11
# See: https://bugzilla.yoctoproject.org/show_bug.cgi?id=15803
PACKAGECONFIG[clangd-dexp] = "-DCLANGD_BUILD_DEXP=ON,-DCLANGD_BUILD_DEXP=OFF,,"
-
PACKAGECONFIG[compiler-rt] = "-DCLANG_DEFAULT_RTLIB=compiler-rt,,"
-PACKAGECONFIG[eh] = "-DLLVM_ENABLE_EH=ON,-DLLVM_ENABLE_EH=OFF,,"
-PACKAGECONFIG[exegesis] = "-DLLVM_TOOL_LLVM_EXEGESIS_BUILD=ON,-DLLVM_TOOL_LLVM_EXEGESIS_BUILD=OFF"
PACKAGECONFIG[libcplusplus] = "-DCLANG_DEFAULT_CXX_STDLIB=libc++,,"
-PACKAGECONFIG[libedit] = "-DLLVM_ENABLE_LIBEDIT=ON,-DLLVM_ENABLE_LIBEDIT=OFF,libedit libedit-native"
PACKAGECONFIG[libomp] = "-DCLANG_DEFAULT_OPENMP_RUNTIME=libomp,,"
PACKAGECONFIG[lld] = "-DCLANG_DEFAULT_LINKER=lld,,,"
PACKAGECONFIG[lto] = "-DLLVM_ENABLE_LTO=Full -DLLVM_BINUTILS_INCDIR=${STAGING_INCDIR},,binutils,"
-PACKAGECONFIG[opt-viewer] = "-DLLVM_TOOL_OPT_VIEWER_BUILD=ON,-DLLVM_TOOL_OPT_VIEWER_BUILD=OFF, \
- python3-pyyaml-native python3-pygments-native python3-pyyaml python3-pygments, \
- python3-pyyaml python3-pygments,"
-PACKAGECONFIG[pfm] = "-DLLVM_ENABLE_LIBPFM=ON,-DLLVM_ENABLE_LIBPFM=OFF,libpfm,"
-PACKAGECONFIG[rtti] = "-DLLVM_ENABLE_RTTI=ON,-DLLVM_ENABLE_RTTI=OFF,,"
-PACKAGECONFIG[shared-libs] = "-DLLVM_BUILD_LLVM_DYLIB=ON -DLLVM_LINK_LLVM_DYLIB=ON,,,"
-PACKAGECONFIG[split-dwarf] = "-DLLVM_USE_SPLIT_DWARF=ON,-DLLVM_USE_SPLIT_DWARF=OFF,,"
PACKAGECONFIG[thin-lto] = "-DLLVM_ENABLE_LTO=Thin -DLLVM_BINUTILS_INCDIR=${STAGING_INCDIR},,binutils,"
PACKAGECONFIG[unwindlib] = "-DCLANG_DEFAULT_UNWINDLIB=libunwind,-DCLANG_DEFAULT_UNWINDLIB=libgcc,,"
PACKAGECONFIG[libclang-python] = "-DCLANG_PYTHON_BINDINGS_VERSIONS=${PYTHON_BASEVERSION},,"
-OECMAKE_SOURCEPATH = "${S}/llvm"
-
-# By default we build all the supported CPU architectures, and the GPU targets
-# if the opencl, opengl or vulkan DISTRO_FEATURES are enabled.
-#
-# For target builds we default to building that specific architecture, BPF, and the GPU targets if required.
-#
-# The available target list can be seen in the source code
-# in the LLVM_ALL_TARGETS assignment:
-# https://github.com/llvm/llvm-project/blob/main/llvm/CMakeLists.txt
-LLVM_TARGETS_GPU ?= "${@bb.utils.contains_any('DISTRO_FEATURES', 'opencl opengl vulkan', 'AMDGPU;NVPTX;SPIRV', '', d)}"
-LLVM_TARGETS_TO_BUILD ?= "AArch64;ARM;BPF;Mips;PowerPC;RISCV;X86;LoongArch;${LLVM_TARGETS_GPU}"
-LLVM_TARGETS_TO_BUILD:class-target ?= "${@get_clang_host_arch(bb, d)};BPF;${LLVM_TARGETS_GPU}"
-
-LLVM_EXPERIMENTAL_TARGETS_TO_BUILD ?= ""
+OECMAKE_SOURCEPATH = "${S}/clang"
-HF = ""
-HF:class-target = "${@ bb.utils.contains('TUNE_CCARGS_MFLOAT', 'hard', 'hf', '', d)}"
-HF[vardepvalue] = "${HF}"
-
-# Ensure that LLVM_PROJECTS does not contain compiler runtime components e.g. libcxx etc
-# they are enabled via LLVM_ENABLE_RUNTIMES
-LLVM_PROJECTS ?= "clang;clang-tools-extra"
# linux hosts (.so) on Windows .pyd
SOLIBSDEV:mingw32 = ".pyd"
EXTRA_OECMAKE += "-DLLVM_ENABLE_ASSERTIONS=OFF \
-DLLVM_APPEND_VC_REV=OFF \
- -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF \
+ -DLLVM_BUILD_LLVM_DYLIB=ON \
+ -DLLVM_LINK_LLVM_DYLIB=ON \
-DLLVM_ENABLE_EXPENSIVE_CHECKS=OFF \
-DLLVM_ENABLE_PIC=ON \
-DCLANG_DEFAULT_PIE_ON_LINUX=ON \
- -DLLVM_BINDINGS_LIST='' \
- -DLLVM_ENABLE_FFI=ON \
- -DLLVM_ENABLE_ZSTD=ON \
-DFFI_INCLUDE_DIR=$(pkg-config --variable=includedir libffi) \
-DLLVM_BUILD_EXTERNAL_COMPILER_RT=ON \
-DCMAKE_SYSTEM_NAME=Linux \
-DCMAKE_BUILD_TYPE=MinSizeRel \
-DLLVM_ENABLE_PROJECTS='${LLVM_PROJECTS}' \
- -DLLVM_BINUTILS_INCDIR=${STAGING_INCDIR} \
-DLLVM_VERSION_SUFFIX='${VER_SUFFIX}' \
- -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON \
- -DLLVM_TARGETS_TO_BUILD='${LLVM_TARGETS_TO_BUILD}' \
- -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD='${LLVM_EXPERIMENTAL_TARGETS_TO_BUILD}' \
+ -DLLVM_CMAKE_DIR=${STAGING_LIBDIR}/cmake/llvm \
-DLLVM_NATIVE_TOOL_DIR=${STAGING_BINDIR_NATIVE} \
- -DLLVM_TABLEGEN=${STAGING_BINDIR_NATIVE}/llvm-tblgen \
-DLLVM_TABLEGEN_EXE=${STAGING_BINDIR_NATIVE}/llvm-tblgen \
-DLLVM_INCLUDE_TESTS=OFF \
-DCROSS_TOOLCHAIN_FLAGS_NATIVE='-DCMAKE_TOOLCHAIN_FILE=${WORKDIR}/toolchain-native.cmake' \
+ -DLLVM_LIBDIR_SUFFIX=${LLVM_LIBDIR_SUFFIX} \
"
EXTRA_OECMAKE:append:class-nativesdk = "\
-DCMAKE_AR=${STAGING_BINDIR_TOOLCHAIN}/${TARGET_PREFIX}llvm-ar \
-DCMAKE_NM=${STAGING_BINDIR_TOOLCHAIN}/${TARGET_PREFIX}llvm-nm \
-DCMAKE_STRIP=${STAGING_BINDIR_TOOLCHAIN}/${TARGET_PREFIX}llvm-strip \
- -DLLVM_TARGET_ARCH=${HOST_ARCH} \
- -DLLVM_DEFAULT_TARGET_TRIPLE=${TARGET_SYS}${HF} \
- -DLLVM_HOST_TRIPLE=${TARGET_SYS}${HF} \
- -DLLVM_LIBDIR_SUFFIX=${LLVM_LIBDIR_SUFFIX} \
"
-DEPENDS = "binutils zlib zstd libffi libxml2 libxml2-native llvm-tblgen-native"
+DEPENDS = "llvm-tblgen-native llvm binutils zlib zstd libffi libxml2 libxml2-native"
DEPENDS:append:class-nativesdk = " clang-crosssdk-${SDK_SYS} virtual/nativesdk-cross-binutils"
DEPENDS:append:class-target = " ${MLPREFIX}clang-cross-${TARGET_ARCH} ${@bb.utils.contains('TC_CXX_RUNTIME', 'llvm', 'compiler-rt libcxx', '', d)}"
RDEPENDS:${PN}:append:class-target = "${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-lld', ' lld', '', d)}"
RRECOMMENDS:${PN}:append:class-target = "binutils ${@bb.utils.contains('TC_CXX_RUNTIME', 'llvm', ' libcxx-dev', '', d)}"
-# patch out build host paths for reproducibility
-reproducible_build_variables() {
- sed -i -e "s,${DEBUG_PREFIX_MAP},,g" \
- -e "s,--sysroot=${RECIPE_SYSROOT},,g" \
- -e "s,${STAGING_DIR_HOST},,g" \
- -e "s,${S}/llvm,,g" \
- -e "s,${B},,g" \
- ${B}/tools/llvm-config/BuildVariables.inc
-}
-
-do_configure:append:class-target() {
- reproducible_build_variables
-}
-
-do_configure:append:class-nativesdk() {
- reproducible_build_variables
+do_configure:prepend() {
+ # Link clang-tools-extra into the clang tree as clang will look for it here
+ # if it's doing a standalone build.
+ ln -srf ${S}/clang-tools-extra ${S}/clang/tools/extra
}
do_install:append() {
- oe_multilib_header llvm/Config/llvm-config.h
oe_multilib_header clang/Config/config.h
}
do_install:append:class-target () {
- # Allow bin path to change based on YOCTO_ALTERNATE_EXE_PATH
- sed -i 's;${_IMPORT_PREFIX}/bin;${_IMPORT_PREFIX_BIN};g' ${D}${libdir}/cmake/llvm/LLVMExports-*.cmake
-
- # Insert function to populate Import Variables
- sed -i "4i\
-if(DEFINED ENV{YOCTO_ALTERNATE_EXE_PATH})\n\
- execute_process(COMMAND \"llvm-config\" \"--bindir\" OUTPUT_VARIABLE _IMPORT_PREFIX_BIN OUTPUT_STRIP_TRAILING_WHITESPACE)\n\
-else()\n\
- set(_IMPORT_PREFIX_BIN \"\${_IMPORT_PREFIX}/bin\")\n\
-endif()\n" ${D}${libdir}/cmake/llvm/LLVMExports-*.cmake
-
if [ -n "${LLVM_LIBDIR_SUFFIX}" ]; then
mkdir -p ${D}${nonarch_libdir}
mv ${D}${libdir}/clang ${D}${nonarch_libdir}/clang
llvm-addr2line llvm-dwp llvm-size llvm-strings llvm-cov; do
ln -sf $t ${D}${bindir}/${TARGET_PREFIX}$t
done
-
- # reproducibility
- sed -i -e 's,${B},,g' ${D}${libdir}/cmake/llvm/LLVMConfig.cmake
-}
-
-do_install:append:class-native () {
- if ${@bb.utils.contains('PACKAGECONFIG', 'clangd', 'true', 'false', d)}; then
- install -Dm 0755 ${B}${BINPATHPREFIX}/bin/clangd-indexer ${D}${bindir}/clangd-indexer
- fi
-
- for f in `find ${D}${bindir} -executable -type f -not -type l`; do
- test -n "`file -b $f|grep -i ELF`" && ${STRIP} $f
- echo "stripped $f"
- done
- ln -sf llvm-config ${D}${bindir}/llvm-config${PV}
-
- # These are provided by llvm-tblgen-native
- rm ${D}${bindir}/*-tblgen
}
do_install:append:class-nativesdk () {
- if [ -e ${D}${libdir}/cmake/llvm/LLVMConfig.cmake ] ; then
- sed -i -e "s|${B}/./bin/||g" ${D}${libdir}/cmake/llvm/LLVMConfig.cmake
- fi
- if ${@bb.utils.contains('PACKAGECONFIG', 'clangd', 'true', 'false', d)}; then
- install -Dm 0755 ${B}${BINPATHPREFIX}/bin/clangd-indexer ${D}${bindir}/clangd-indexer
- fi
-
- for f in `find ${D}${bindir} -executable -type f -not -type l`; do
- test -n "`file -b $f|grep -i ELF`" && ${STRIP} $f
- done
-
- rm -rf ${D}${datadir}/llvm/cmake
- rm -rf ${D}${datadir}/llvm
-
#reproducibility
if [ -e ${D}${libdir}/cmake/llvm/LLVMConfig.cmake ] ; then
sed -i -e 's,${B},,g' ${D}${libdir}/cmake/llvm/LLVMConfig.cmake
fi
}
-PROVIDES:append:class-native = " llvm-native"
-PROVIDES:append:class-target = " llvm"
-PROVIDES:append:class-nativesdk = " nativesdk-llvm"
-
-PACKAGES =+ "${PN}-libllvm ${PN}-libclang-python ${PN}-libclang-cpp ${PN}-tidy ${PN}-format ${PN}-tools \
- libclang llvm-linker-tools"
+PACKAGES =+ "${PN}-libclang-python ${PN}-libclang-cpp ${PN}-tidy ${PN}-format ${PN}-tools libclang"
BBCLASSEXTEND = "native nativesdk"
RRECOMMENDS:${PN}-tidy += "${PN}-tools"
-FILES:llvm-linker-tools = "${libdir}/LLVMgold* ${libdir}/libLTO.so.* ${libdir}/LLVMPolly*"
-
FILES:${PN}-libclang-cpp = "${libdir}/libclang-cpp.so.*"
FILES:${PN}-libclang-python = "${PYTHON_SITEPACKAGES_DIR}/clang/*"
${nonarch_libdir}/${BPN}/*/include/ \
"
-FILES:${PN}-libllvm =+ "\
- ${libdir}/libLLVM.so.${MAJOR_VER}.${MINOR_VER} \
- ${libdir}/libLLVM-${MAJOR_VER}.so \
- ${libdir}/libRemarks.so.* \
-"
-
FILES:libclang = "\
${libdir}/libclang.so.* \
"
INSANE_SKIP:${PN} += "already-stripped"
#INSANE_SKIP:${PN}-dev += "dev-elf"
-INSANE_SKIP:${PN}-libllvm = "dev-so"
#Avoid SSTATE_SCAN_COMMAND running sed over llvm-config.
SSTATE_SCAN_FILES:remove = "*-config"
SYSROOT_PREPROCESS_FUNCS:append:class-nativesdk = " clang_sysroot_preprocess"
clang_sysroot_preprocess() {
- install -d ${SYSROOT_DESTDIR}${bindir_crossscripts}/
- install -m 0755 ${S}/llvm/tools/llvm-config/llvm-config ${SYSROOT_DESTDIR}${bindir_crossscripts}/
- ln -sf llvm-config ${SYSROOT_DESTDIR}${bindir_crossscripts}/llvm-config${PV}
+ install -d ${SYSROOT_DESTDIR}${bindir}/
+ # clang and clang-tools
binaries="diagtool clang-${MAJOR_VER} clang-format clang-offload-packager
- clang-offload-bundler clang-scan-deps clang-repl
- clang-refactor clang-check clang-extdef-mapping clang-apply-replacements
- clang-reorder-fields clang-tidy clang-change-namespace clang-doc clang-include-fixer
- find-all-symbols clang-move clang-query pp-trace modularize"
+ clang-offload-bundler clang-scan-deps clang-repl
+ clang-refactor clang-check clang-extdef-mapping"
+
+ # clang-extra-tools
+ binaries="${binaries} clang-apply-replacements clang-reorder-fields
+ clang-tidy clang-change-namespace clang-doc clang-include-fixer
+ find-all-symbols clang-move clang-query pp-trace modularize"
if ${@bb.utils.contains('PACKAGECONFIG', 'clangd', 'true', 'false', d)}; then
binaries="${binaries} clangd"
projects / thirdparty / openembedded / openembedded-core-contrib.git / commitdiff
