[15 regression] "module flag identifiers must be unique (or of 'require' type)

[berolinux]

Trying to build Qt 6.4.0-beta4 with clang/lld 15-rc3 and LTO enabled results in

module flag identifiers must be unique (or of 'require' type)
!"CG Profile"
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: /usr/bin/ld.lld --build-id=sha1 --eh-frame-hdr -m elf_x86_64 -shared -o lib/libQt6Core.so.6.4.0 /usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/12.2.0/../../../../lib64/crti.o /usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/12.2.0/crtbeginS.o -L/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/12.2.0 -L/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/12.2.0/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/lib -L/usr/lib -plugin-opt=mcpu=znver1 -plugin-opt=O3 -O2 --no-undefined --version-script /home/bero/temp/abf/qt6-qtbase/BUILD/qtbase-everywhere-src-6.4.0-beta4/build/src/corelib/Core.version --no-undefined -e qt_core_boilerplate --gc-sections --enable-new-dtags -soname libQt6Core.so.6 src/corelib/CMakeFiles/Core.dir/Core_autogen/mocs_compilation.cpp.o src/corelib/CMakeFiles/Core.dir/global/qsimd.cpp.o src/corelib/CMakeFiles/Core.dir/tools/qhash.cpp.o src/corelib/CMakeFiles/Core.dir/compat/removed_api.cpp.o 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src/corelib/CMakeFiles/Core.dir/kernel/qsharedmemory_unix.cpp.o src/corelib/CMakeFiles/Core.dir/kernel/qsystemsemaphore_posix.cpp.o src/corelib/CMakeFiles/Core.dir/kernel/qsystemsemaphore_systemv.cpp.o src/corelib/CMakeFiles/Core.dir/kernel/qsystemsemaphore_unix.cpp.o src/corelib/CMakeFiles/Core.dir/serialization/qcborstreamreader.cpp.o src/corelib/CMakeFiles/Core.dir/serialization/qcborstreamwriter.cpp.o src/corelib/CMakeFiles/Core.dir/mimetypes/qmimedatabase.cpp.o src/corelib/CMakeFiles/Core.dir/mimetypes/qmimeglobpattern.cpp.o src/corelib/CMakeFiles/Core.dir/mimetypes/qmimemagicrule.cpp.o src/corelib/CMakeFiles/Core.dir/mimetypes/qmimemagicrulematcher.cpp.o src/corelib/CMakeFiles/Core.dir/mimetypes/qmimeprovider.cpp.o src/corelib/CMakeFiles/Core.dir/mimetypes/qmimetype.cpp.o src/corelib/CMakeFiles/Core.dir/mimetypes/qmimetypeparser.cpp.o -lm /usr/lib64/libicui18n.so /usr/lib64/libicuuc.so /usr/lib64/libicudata.so -ldl /usr/lib64/libglib-2.0.so /usr/lib64/libz.so /usr/lib64/libsystemd.so /usr/lib64/libdouble-conversion.so.3.2.0 /usr/lib64/libpcre2-16.so /usr/lib64/libzstd.a /usr/lib64/libgthread-2.0.so -lrt -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/12.2.0/crtendS.o /usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/12.2.0/../../../../lib64/crtn.o
 #0 0x00007ff827e23a01 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/lib64/libLLVM-15.so+0x41d0a01)
 #1 0x00007ff827e23d9b (/lib64/libLLVM-15.so+0x41d0d9b)
 #2 0x00007ff827e2264a llvm::sys::RunSignalHandlers() (/lib64/libLLVM-15.so+0x41cf64a)
 #3 0x00007ff827e232f6 (/lib64/libLLVM-15.so+0x41d02f6)
 #4 0x00007ff8238672a0 (/lib64/libc.so.6+0x382a0)
 #5 0x00007ff8238b6ffc (/lib64/libc.so.6+0x87ffc)
 #6 0x00007ff8238671f2 raise (/lib64/libc.so.6+0x381f2)
 #7 0x00007ff823851472 abort (/lib64/libc.so.6+0x22472)
 #8 0x00007ff827d1e9cc llvm::report_fatal_error(llvm::Twine const&, bool) (/lib64/libLLVM-15.so+0x40cb9cc)
 #9 0x00007ff827d1e856 (/lib64/libLLVM-15.so+0x40cb856)
#10 0x00007ff82813307e llvm::VerifierPass::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/lib64/libLLVM-15.so+0x44e007e)
#11 0x00007ff829e2213f (/lib64/libLLVM-15.so+0x61cf13f)
#12 0x00007ff8280c5e20 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/lib64/libLLVM-15.so+0x4472e20)
#13 0x00007ff829e1ee1d (/lib64/libLLVM-15.so+0x61cbe1d)
#14 0x00007ff829e1c9ee 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&) (/lib64/libLLVM-15.so+0x61c99ee)
#15 0x00007ff829e22854 llvm::lto::backend(llvm::lto::Config const&, std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int)>, unsigned int, llvm::Module&, llvm::ModuleSummaryIndex&) (/lib64/libLLVM-15.so+0x61cf854)
#16 0x00007ff829e141da llvm::lto::LTO::runRegularLTO(std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int)>) (/lib64/libLLVM-15.so+0x61c11da)
#17 0x00007ff829e13618 llvm::lto::LTO::run(std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int)>, std::function<llvm::Expected<std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int)>> (unsigned int, llvm::StringRef)>) (/lib64/libLLVM-15.so+0x61c0618)
#18 0x0000000000560a02 lld::elf::BitcodeCompiler::compile() (/usr/bin/ld.lld+0x560a02)
#19 0x00000000004bee6c void lld::elf::LinkerDriver::compileBitcodeFiles<llvm::object::ELFType<(llvm::support::endianness)1, true>>(bool) (/usr/bin/ld.lld+0x4bee6c)
#20 0x00000000004b9903 lld::elf::LinkerDriver::link(llvm::opt::InputArgList&) (/usr/bin/ld.lld+0x4b9903)
#21 0x00000000004ad798 lld::elf::LinkerDriver::linkerMain(llvm::ArrayRef<char const*>) (/usr/bin/ld.lld+0x4ad798)
#22 0x00000000004ab16f lld::elf::link(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, bool, bool) (/usr/bin/ld.lld+0x4ab16f)
#23 0x00000000003d482f (/usr/bin/ld.lld+0x3d482f)
#24 0x00000000003d516c main (/usr/bin/ld.lld+0x3d516c)
#25 0x00007ff82385218a (/lib64/libc.so.6+0x2318a)
#26 0x00007ff823852245 __libc_start_main (/lib64/libc.so.6+0x23245)
#27 0x00000000003d24f1 _start (/usr/bin/ld.lld+0x3d24f1)
clang-15: error: unable to execute command: Aborted (core dumped)
clang-15: error: linker command failed due to signal (use -v to see invocation)

clang 14.0.6 works as expected. Sorry, no small test case yet

[berolinux]

The trigger seems to be linking clang 15 LTO code to a static libzstd.a built with clang 14 (the problem goes away when rebuilding libzstd.a with clang 15 or using a shared libzstd.so).
Probably not an important problem, but the error message could certainly be more meaningful.

[aminya]

I can reproduce the issue. It happens when I try to use PGO and LTO together with LLVM 15.0.7.

@berolinux Did you find a generic workaround for the problem? I am not using libzsdtd.a

[kevincox]

I'm also seeing this compiling a Rust project.

module flag identifiers must be unique (or of 'require' type)
!"CG Profile"
LLVM ERROR: Broken module found, compilation aborted!

The project is open source if you want to investigate. https://gitlab.com/kevincox/ricochetrobots

This can be reproduced by removing the -Clto=false and running nix-build -A native. Right now I am using nixpkgs 18324978d632ffc55ef1d928e81630c620f4f447 as a base.

[zamazan4ik]

And I just got the same error during optimization Vector with PGO: Kobzol/cargo-pgo#32 (comment)

[zamazan4ik]

@kevincox try to enable ThinLTO to your project (with lto = "thin" in your Cargo.toml file). It helped me to avoid the bug with LTO ("fat") + PGO in Vector. Will be interesting to see your results with the same workaround.

In Vector right now I use the following options:

[profile.release]
debug = false
codegen-units = 1
lto = "thin"

PGO build is done with cargo-pgo.

[kevincox]

This still occurred for me with thin LTO configured as you described.

[zamazan4ik]

it's a pity :(

[zamazan4ik]

Never mind, ThinLTO does not help me too (I've just made a silly mistake). For now, the only way to avoid the bug is to completely disable LTO (with lto = "off").

[pmor13]

Same here (ld.lld: 18.0.1, clang: 18.0.1, opt: 18.1.8).

[pmor13]

What's the preferred / recommended mitigation for this bug?

When (approximately) this bug will be fixed?