[compiler-rt] lots of "warning: unknown warning option '-Werror=builtin-declaration-mismatch'" messages

[ms178]

Compiling llvm-git with 0a0e06f leads to the following new warnings in compiler-rt:

[747/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/floatundisf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[748/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/muldi3.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[749/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/ashrdi3.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[750/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/floatdidf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[751/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/floatdisf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[752/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/floatundidf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[753/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/lshrdi3.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[754/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/moddi3.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[755/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/udivdi3.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[757/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/ashldi3.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[766/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/divdi3.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[768/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/umoddi3.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[770/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/floatdixf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[790/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-i386.dir/i386/floatundixf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[929/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-x86_64.dir/x86_64/floatundidf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[930/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-x86_64.dir/x86_64/floatundisf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]
1 warning generated.
[942/6672] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-x86_64.dir/x86_64/floatundixf.S.o
warning: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Wunknown-warning-option]

CachyOS also ships with a brand new gcc-version 13.2.1 20231110.

[thesamesam]

-Wbuiltin-declaration-mismatch is not referenced anywhere within the LLVM repository. It's likely your toolchain setting it or your build script.

[ms178]

That's what I don't understand, neither my llvm-git PKGBUILD nor the /etc/makepkg.conf do set that explicitly.

[ms178]

For reference, I am attaching the build config which is inside the PKGBUILD: PKGBUILD.txt

And these flags are set in /etc/makepkg.conf:

export CC=clang
export CXX=clang++
export CC_LD=lld
export CXX_LD=lld
export AR=llvm-ar
export NM=llvm-nm
export STRIP=llvm-strip
export OBJCOPY=llvm-objcopy
export OBJDUMP=llvm-objdump
export READELF=llvm-readelf
export RANLIB=llvm-ranlib
export HOSTCC=clang
export HOSTCXX=clang++
export HOSTAR=llvm-ar
export CPPFLAGS="-D_FORTIFY_SOURCE=0"
export CFLAGS="-O3 -march=native -mtune=native -maes -mbmi2 -mpclmul -mllvm -inline-threshold=500 -mllvm -extra-vectorizer-passes -mllvm -enable-cond-stores-vec -mllvm -slp-vectorize-hor-store -mllvm -enable-loopinterchange -mllvm -enable-loop-distribute -mllvm -enable-unroll-and-jam -mllvm -enable-loop-flatten -mllvm -interleave-small-loop-scalar-reduction -mllvm -unroll-runtime-multi-exit -mllvm -aggressive-ext-opt -fno-math-errno -fno-trapping-math -falign-functions=32 -funroll-loops -fno-semantic-interposition -fcf-protection=none -mharden-sls=none -fomit-frame-pointer -mprefer-vector-width=256 -flto=thin -fwhole-program-vtables -fsplit-lto-unit -mllvm -adce-remove-loops -mllvm -enable-ext-tsp-block-placement=1 -mllvm -enable-gvn-hoist -mllvm -enable-dfa-jump-thread -Wno-error -fgnuc-version=13.2.1 -fprofile-use=/home/marcus/Downloads/llvm17.profdata -ffp-contract=fast -fdata-sections -ffunction-sections -fno-unique-section-names -fsplit-machine-functions -freroll-loops -w"
export CXXFLAGS="${CFLAGS} -Wp,-U_GLIBCXX_ASSERTIONS"
export LDFLAGS="-Wl,--lto-CGO3 -Wl,--gc-sections -Wl,--icf=all -Wl,--lto-O3,-O3,-Bsymbolic-functions,--as-needed -fcf-protection=none -mharden-sls=none -Wl,-mllvm -Wl,-extra-vectorizer-passes -Wl,-mllvm -Wl,-enable-cond-stores-vec -Wl,-mllvm -Wl,-slp-vectorize-hor-store -Wl,-mllvm -Wl,-enable-loopinterchange -Wl,-mllvm -Wl,-enable-loop-distribute -Wl,-mllvm -Wl,-enable-unroll-and-jam -Wl,-mllvm -Wl,-enable-loop-flatten -Wl,-mllvm -Wl,-interleave-small-loop-scalar-reduction -Wl,-mllvm -Wl,-unroll-runtime-multi-exit -Wl,-mllvm -Wl,-aggressive-ext-opt -Wl,-mllvm -Wl,-enable-interleaved-mem-accesses -Wl,-mllvm -Wl,-enable-masked-interleaved-mem-accesses -march=native -maes -mbmi2 -mpclmul -flto=thin -fwhole-program-vtables -fuse-ld=lld -Wl,-zmax-page-size=0x200000 -fprofile-use=/home/marcus/Downloads/llvm17.profdata -freroll-loops -Wl,-mllvm -Wl,-adce-remove-loops -Wl,-mllvm -Wl,-enable-ext-tsp-block-placement=1 -Wl,-mllvm -Wl,-enable-gvn-hoist -Wl,-mllvm -Wl,-enable-dfa-jump-thread -Wl,--push-state -Wl,-whole-archive -ljemalloc_pic -Wl,--pop-state -lpthread -lstdc++ -lm -ldl -Wl,--undefined-version"
CCLDFLAGS="$LDFLAGS"
CXXLDFLAGS="$LDFLAGS"
export ASFLAGS="-D__AVX__=1 -D__AVX2__=1 -msse2avx -D__FMA__=1"

[mati865]

@thesamesam it is, since dc298fe

[ms178]

@arichardson @thesamesam Ping. Could you please take a look, this issue still reproduces on latest main.

[ms178]

Steps to reproduce:

1. Get two build scripts from:
   https://github.com/ms178/archpkgbuilds/tree/main/toolchain-experimental/llvm-bolt-scripts-master

• https://github.com/ms178/archpkgbuilds/blob/main/toolchain-experimental/llvm-bolt-scripts-master/setup_llvm_repo.bash
• https://github.com/ms178/archpkgbuilds/blob/main/toolchain-experimental/llvm-bolt-scripts-master/build_stage1.bash

2. Make them executable and run them in the given order.

[ms178]

You might need to adjust the build_stage1.bash script manually, as I use a local PGO-profile with it.

[arichardson]

Well that flag is only passed if the CMake configure command detects it as supported, so I have no idea why this is failing unless you are somehow overriding the compiler manually?

[ms178]

I set the compiler flags via cmake within the scripts. And before the mentioned change, there were no such warnings.

[arichardson]

I don't understand why this would be going wrong since cmake tests if the flag is supported before using it. The cmake log should be helpful for figuring this out.

Could be an issue with using DLLVM_ENABLE_PROJECTS=compiler-rt. This is no longer supported on main and should be using runtimes instead.

[ms178]

Here are the logs from the ENABLE_PROJECTS build.

cmake_log.txt

CMakeCache.txt

With a ENABLE_RUNTIMES build, I don't get these warnings.