Package: src:llvm-toolchain-17
Version: 17.0.0~+rc3-1~exp1
Severity: serious
Tags: sid trixie
the wasm builds fail on architectures with -march= and -mfpu flags set for the
host, like armhf, and probably armel. This used to work in LLVM 16.
I assume this is an upstream issue (confusing the host and the target), but here
is one way to work-around it, to remove these flags from the flag settings.
Another possibility could be to disable the wasm builds on these architectures.
patch for the work around is attached.
[...]
FAILED: CMakeFiles/cmTC_31967.dir/testCCompiler.c.obj
"/<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins/bin/clang"
--target=wasm32-unknown-unknown -O2 -DNDEBUG -g1 -fstack-protector-strong
-Wformat -Werror=format-security -Wno-unused-command-line-argument
-march=armv7-a -mfpu=vfpv3-d16 -Wdate-time -D_FORTIFY_SOURCE=2 -MD -MT CMak
eFiles/cmTC_31967.dir/testCCompiler.c.obj -MF
CMakeFiles/cmTC_31967.dir/testCCompiler.c.obj.d -o
CMakeFiles/cmTC_31967.dir/testCCompiler.c.obj
-c
'/<<PKGBUILDDIR>>/build-wasm/compiler-rt-wasm32/CMakeFiles/CMakeScratch/TryCompile-X7CN7p/testCCompiler.c'
clang: error: unsupported option '-march=' for target
'wasm32-unknown-unknown'
clang: error: unsupported option '-mfpu=' for target
'wasm32-unknown-unknown'
ninja: build stopped: subcommand failed.
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:9 (project)
-- Configuring incomplete, errors occurred!
make[1]: *** [debian/rules:815: build-wasm/compiler-rt-wasm32] Error 1 * Don't pass -march= and -mcpu= flags to the wasm builds.
diff -Nru llvm-toolchain-17-17.0.0~+rc2/debian/rules llvm-toolchain-17-17.0.0~+rc2/debian/rules
--- llvm-toolchain-17-17.0.0~+rc2/debian/rules 2023-08-15 21:25:12.000000000 +0200
+++ llvm-toolchain-17-17.0.0~+rc2/debian/rules 2023-08-23 17:26:07.000000000 +0200
@@ -821,8 +821,8 @@
-DCMAKE_ASM_COMPILER_TARGET=$(cpu)-unknown-unknown \
-DCMAKE_C_COMPILER=$(STAGE_2_BIN_DIR)/clang \
-DCMAKE_CXX_COMPILER=$(STAGE_2_BIN_DIR)/clang++ \
- -DCMAKE_C_FLAGS="$(opt_flags) $(STAGE_2_CFLAGS)" \
- -DCMAKE_CXX_FLAGS="$(opt_flags) $(STAGE_2_CXXFLAGS)" \
+ -DCMAKE_C_FLAGS="$(opt_flags) $(filter-out -march=%, $(filter-out -mfpu=%, $(STAGE_2_CFLAGS)))" \
+ -DCMAKE_CXX_FLAGS="$(opt_flags) $(filter-out -march=%, $(filter-out -mfpu=%, $(STAGE_2_CXXFLAGS)))" \
-DCMAKE_SHARED_LINKER_FLAGS="$(STAGE_2_LDFLAGS) -L$(STAGE_2_LIB_DIR)" \
-DCMAKE_MODULE_LINKER_FLAGS="$(STAGE_2_LDFLAGS) -L$(STAGE_2_LIB_DIR)" \
-DCMAKE_EXE_LINKER_FLAGS="$(STAGE_2_LDFLAGS) -L$(STAGE_2_LIB_DIR)" \
@@ -885,8 +885,8 @@
-DCMAKE_CXX_COMPILER=$(STAGE_2_BIN_DIR)/clang++ \
-DCMAKE_AR=$(STAGE_2_BIN_DIR)/llvm-ar \
-DCMAKE_RANLIB=$(STAGE_2_BIN_DIR)/llvm-ranlib \
- -DCMAKE_C_FLAGS="$(opt_flags) $(STAGE_2_CFLAGS) -fno-stack-protector" \
- -DCMAKE_CXX_FLAGS="$(opt_flags) $(STAGE_2_CXXFLAGS) -fno-stack-protector" \
+ -DCMAKE_C_FLAGS="$(opt_flags) $(filter-out -march=%, $(filter-out -mfpu=%, $(STAGE_2_CFLAGS))) -fno-stack-protector" \
+ -DCMAKE_CXX_FLAGS="$(opt_flags) $(filter-out -march=%, $(filter-out -mfpu=%, $(STAGE_2_CXXFLAGS))) -fno-stack-protector" \
-DCMAKE_SHARED_LINKER_FLAGS="$(LDFLAGS) -L$(STAGE_2_LIB_DIR)" \
-DCMAKE_MODULE_LINKER_FLAGS="$(LDFLAGS) -L$(STAGE_2_LIB_DIR)" \
-DCMAKE_EXE_LINKER_FLAGS="$(LDFLAGS) -L$(STAGE_2_LIB_DIR)" \
