LTO crash "Alias must point to a definition"

[BrettRD]

I can't tell if this is a duplicate

I Built LLVM from source at main (737d6ca)
and used clang to build https://github.com/Open-Cascade-SAS/OCCT at main (f7dea47c33b579b344c548d39549dca09f98bc3a)

Link-time optimisation fails building TKMath.so:

cmake .. \
-D BUILD_LIBRARY_TYPE="Shared" \
-D CMAKE_BUILD_TYPE="RelWithDebInfo" \
-D CMAKE_C_COMPILER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/clang" \
-D CMAKE_CXX_COMPILER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/clang" \
-D CMAKE_LINKER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld" \
-D CMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld -flto" \
-D CMAKE_SHARED_LINKER_FLAGS="-fuse-ld=lld -flto" \
-D CMAKE_C_FLAGS="-flto" \
-D CMAKE_CXX_FLAGS="-flto"

crashes with:

[  3%] Linking CXX shared library ../../lin64/clang/libi/libTKMath.so
Alias must point to a definition
ptr @_ZN17BVH_LinearBuilderIdLi3EED1Ev
LLVM ERROR: Broken module found, compilation aborted!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld --hash-style=gnu --eh-frame-hdr -m elf_x86_64 -shared -o ../../lin64/clang/libi/libTKMath.so.7.8.2 /lib/x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/12/crtbeginS.o -L/usr/lib/gcc/x86_64-linux-gnu/12 -L/usr/lib/gcc/x86_64-linux-gnu/12/../../../../lib64 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib64 -L/lib -L/usr/lib -plugin-opt=mcpu=x86-64 -plugin-opt=O2 -lm -Bsymbolic -soname libTKMath.so.7.8 CMakeFiles/TKMath.dir/__/math/math.cxx.o CMakeFiles/TKMath.dir/__/math/math_BFGS.cxx.o CMakeFiles/TKMath.dir/__/math/math_BissecNewton.cxx.o CMakeFiles/TKMath.dir/__/math/math_BracketedRoot.cxx.o CMakeFiles/TKMath.dir/__/math/math_BracketMinimum.cxx.o CMakeFiles/TKMath.dir/__/math/math_BrentMinimum.cxx.o CMakeFiles/TKMath.dir/__/math/math_ComputeGaussPointsAndWeights.cxx.o CMakeFiles/TKMath.dir/__/math/math_ComputeKronrodPointsAndWeights.cxx.o CMakeFiles/TKMath.dir/__/math/math_Crout.cxx.o CMakeFiles/TKMath.dir/__/math/math_DirectPolynomialRoots.cxx.o CMakeFiles/TKMath.dir/__/math/math_DoubleTab.cxx.o CMakeFiles/TKMath.dir/__/math/math_EigenValuesSearcher.cxx.o CMakeFiles/TKMath.dir/__/math/math_FRPR.cxx.o CMakeFiles/TKMath.dir/__/math/math_Function.cxx.o CMakeFiles/TKMath.dir/__/math/math_FunctionAllRoots.cxx.o CMakeFiles/TKMath.dir/__/math/math_FunctionRoot.cxx.o CMakeFiles/TKMath.dir/__/math/math_FunctionRoots.cxx.o CMakeFiles/TKMath.dir/__/math/math_FunctionSample.cxx.o CMakeFiles/TKMath.dir/__/math/math_FunctionSet.cxx.o CMakeFiles/TKMath.dir/__/math/math_FunctionSetRoot.cxx.o CMakeFiles/TKMath.dir/__/math/math_FunctionWithDerivative.cxx.o CMakeFiles/TKMath.dir/__/math/math_Gauss.cxx.o CMakeFiles/TKMath.dir/__/math/math_GaussLeastSquare.cxx.o CMakeFiles/TKMath.dir/__/math/math_GaussMultipleIntegration.cxx.o CMakeFiles/TKMath.dir/__/math/math_GaussSetIntegration.cxx.o 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/home/brettrd/Documents/projects/adv_optim/enzyme_targets/OCCT/build/lin64/clang/libi: ../../lin64/clang/libi/libTKernel.so.7.8.2 -lpthread -lrt -lstdc++ -ldl -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-linux-gnu/12/crtendS.o /lib/x86_64-linux-gnu/crtn.o
1.	Running pass "verify" on module "ld-temp.o"
 #0 0x000055567e8f5edb llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x722edb)
 #1 0x000055567e8f332b llvm::sys::RunSignalHandlers() (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x72032b)
 #2 0x000055567e8f3455 SignalHandler(int) Signals.cpp:0:0
 #3 0x00007fb782b7c050 (/lib/x86_64-linux-gnu/libc.so.6+0x3c050)
 #4 0x00007fb782bcaebc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x00007fb782b7bfb2 raise ./signal/../sysdeps/posix/raise.c:27:6
 #6 0x00007fb782b66472 abort ./stdlib/abort.c:81:7
 #7 0x000055567e7a0203 (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x5cd203)
 #8 0x000055567e8926ea (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x6bf6ea)
 #9 0x0000555681a20d58 (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x384dd58)
#10 0x000055567f82a72d llvm::detail::PassModel<llvm::Module, llvm::VerifierPass, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x165772d)
#11 0x00005556819df7bc llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x380c7bc)
#12 0x000055567f8325c9 runNewPMPasses(llvm::lto::Config const&, llvm::Module&, llvm::TargetMachine*, unsigned int, bool, llvm::ModuleSummaryIndex*, llvm::ModuleSummaryIndex const*) LTOBackend.cpp:0:0
#13 0x000055567f833ee4 llvm::lto::opt(llvm::lto::Config const&, llvm::TargetMachine*, unsigned int, llvm::Module&, bool, llvm::ModuleSummaryIndex*, llvm::ModuleSummaryIndex const*, std::vector<unsigned char, std::allocator<unsigned char>> const&) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x1660ee4)
#14 0x000055567f836424 llvm::lto::backend(llvm::lto::Config const&, std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int, llvm::Twine const&)>, unsigned int, llvm::Module&, llvm::ModuleSummaryIndex&) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x1663424)
#15 0x000055567f825c80 llvm::lto::LTO::runRegularLTO(std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int, llvm::Twine const&)>) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x1652c80)
#16 0x000055567f829db4 llvm::lto::LTO::run(std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int, llvm::Twine const&)>, llvm::FileCache) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x1656db4)
#17 0x000055567eae5d22 lld::elf::BitcodeCompiler::compile() (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x912d22)
#18 0x000055567ea37337 void lld::elf::LinkerDriver::compileBitcodeFiles<llvm::object::ELFType<(llvm::endianness)1, true>>(bool) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x864337)
#19 0x000055567ea5ccc7 void lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::endianness)1, true>>(llvm::opt::InputArgList&) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x889cc7)
#20 0x000055567ea63d25 lld::elf::LinkerDriver::linkerMain(llvm::ArrayRef<char const*>) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x890d25)
#21 0x000055567ea644bc lld::elf::link(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, bool, bool) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x8914bc)
#22 0x000055567e92e59a lld::unsafeLldMain(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, llvm::ArrayRef<lld::DriverDef>, bool) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x75b59a)
#23 0x000055567e86edcb lld_main(int, char**, llvm::ToolContext const&) (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x69bdcb)
#24 0x000055567e7a70c3 main (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x5d40c3)
#25 0x00007fb782b6724a __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#26 0x00007fb782b67305 call_init ./csu/../csu/libc-start.c:128:20
#27 0x00007fb782b67305 __libc_start_main ./csu/../csu/libc-start.c:347:5
#28 0x000055567e86e671 _start (/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld+0x69b671)
clang: error: unable to execute command: Aborted
clang: error: linker command failed due to signal (use -v to see invocation)
make[2]: *** [src/TKMath/CMakeFiles/TKMath.dir/build.make:3459: lin64/clang/libi/libTKMath.so.7.8.2] Error 1
make[1]: *** [CMakeFiles/Makefile2:1348: src/TKMath/CMakeFiles/TKMath.dir/all] Error 2
make: *** [Makefile:136: all] Error 2

OCCT compiles fine with similar config:

works without lto:

cmake .. \
-D BUILD_LIBRARY_TYPE="Shared" \
-D CMAKE_BUILD_TYPE="RelWithDebInfo" \
-D CMAKE_C_COMPILER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/clang" \
-D CMAKE_CXX_COMPILER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/clang" \
-D CMAKE_LINKER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld" \
-D CMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld" \
-D CMAKE_SHARED_LINKER_FLAGS="-fuse-ld=lld"

works with lto set but no optimisation:

cmake .. \
-D BUILD_LIBRARY_TYPE="Shared" \
-D CMAKE_BUILD_TYPE="Debug" \
-D CMAKE_C_COMPILER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/clang" \
-D CMAKE_CXX_COMPILER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/clang" \
-D CMAKE_LINKER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld" \
-D CMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld -flto" \
-D CMAKE_SHARED_LINKER_FLAGS="-fuse-ld=lld -flto" \
-D CMAKE_C_FLAGS="-flto" \
-D CMAKE_CXX_FLAGS="-flto"

works with lto and static linkage:

cmake .. \
-D BUILD_LIBRARY_TYPE="Static" \
-D CMAKE_BUILD_TYPE="RelWithDebInfo" \
-D CMAKE_C_COMPILER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/clang" \
-D CMAKE_CXX_COMPILER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/clang" \
-D CMAKE_LINKER="/home/brettrd/Documents/projects/adv_optim/enzyme_targets/llvm-project/build/bin/ld.lld" \
-D CMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld -flto -lm" \
-D CMAKE_C_FLAGS="-flto" \
-D CMAKE_CXX_FLAGS="-flto"

Thanks for the great tools!