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AlexDenisov opened this issue Mar 29, 2025 · 3 comments · May be fixed by #140381
Open

LLVM 20 packages ship bitcode instead of object files #133580

AlexDenisov opened this issue Mar 29, 2025 · 3 comments · May be fixed by #140381
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packaging
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LLVM 20.X Release

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@AlexDenisov
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It seems that the packages for (at least) LLVM 20.1.0 and 20.1.1 ship bitcode files instead of object files on both Linux and macOS.

Packages I checked:

This yields packages unusable at least on macOS with Xcode's clang, linking emits a lot of errors like this:

 could not parse bitcode object file /opt/LLVM/20.1.0/lib/libLLVMSupport.a[32](CodeGenCoverage.cpp.o): 'Unknown attribute kind (91) (Producer: 'LLVM20.1.0' Reader: 'LLVM APPLE_1_1600.0.26.6_0')', using libLTO version 'LLVM version 16.0.0' in '/opt/LLVM/20.1.0/lib/libLLVMSupport.a[32](CodeGenCoverage.cpp.o)'

Workaround

As a workaround, one can use compilers from the same package, but also have to use lld (-fuse-ld=lld), otherwise it fails with default Xcode linker (albeit for an unrelated reason):

> echo "int main() { return 0; }" > main.c
> /opt/LLVM/20.1.0/bin/clang main.c
dyld[10373]: Symbol not found: ___cxa_demangle
  Referenced from: <565CE761-C1EB-37F5-9738-E1BCF6F2EC75> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld
  Expected in:     <4C4C44F0-5555-3144-A1B9-74F6D413BAC4> /opt/LLVM/20.1.0/lib/libc++.1.0.dylib
clang: error: unable to execute command: Abort trap: 6
clang: error: linker command failed due to signal (use -v to see invocation)

This works though:

/opt/LLVM/20.1.0/bin/clang main.c -fuse-ld=lld
@AlexDenisov AlexDenisov added bug Indicates an unexpected problem or unintended behavior infrastructure Bugs about LLVM infrastructure labels Mar 29, 2025
@llvmbot
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llvmbot commented Mar 29, 2025

@llvm/issue-subscribers-infrastructure

Author: Alex Denisov (AlexDenisov)

It seems that the packages for (at least) LLVM 20.1.0 and 20.1.1 ship bitcode files instead of object files on both Linux and macOS.

Packages I checked:

This yields packages unusable at least on macOS with Xcode's clang, linking emits a lot of errors like this:

 could not parse bitcode object file /opt/LLVM/20.1.0/lib/libLLVMSupport.a[32](CodeGenCoverage.cpp.o): 'Unknown attribute kind (91) (Producer: 'LLVM20.1.0' Reader: 'LLVM APPLE_1_1600.0.26.6_0')', using libLTO version 'LLVM version 16.0.0' in '/opt/LLVM/20.1.0/lib/libLLVMSupport.a[32](CodeGenCoverage.cpp.o)'

Workaround

As a workaround, one can use compilers from the same package, but also have to use lld (-fuse-ld=lld), otherwise it fails with default Xcode linker (albeit for an unrelated reason):

&gt; echo "int main() { return 0; }" &gt; main.c
&gt; /opt/LLVM/20.1.0/bin/clang main.c
dyld[10373]: Symbol not found: ___cxa_demangle
  Referenced from: &lt;565CE761-C1EB-37F5-9738-E1BCF6F2EC75&gt; /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld
  Expected in:     &lt;4C4C44F0-5555-3144-A1B9-74F6D413BAC4&gt; /opt/LLVM/20.1.0/lib/libc++.1.0.dylib
clang: error: unable to execute command: Abort trap: 6
clang: error: linker command failed due to signal (use -v to see invocation)

This works though:

/opt/LLVM/20.1.0/bin/clang main.c -fuse-ld=lld

@llvmbot
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llvmbot commented Mar 29, 2025

@llvm/issue-subscribers-bug

Author: Alex Denisov (AlexDenisov)

It seems that the packages for (at least) LLVM 20.1.0 and 20.1.1 ship bitcode files instead of object files on both Linux and macOS.

Packages I checked:

This yields packages unusable at least on macOS with Xcode's clang, linking emits a lot of errors like this:

 could not parse bitcode object file /opt/LLVM/20.1.0/lib/libLLVMSupport.a[32](CodeGenCoverage.cpp.o): 'Unknown attribute kind (91) (Producer: 'LLVM20.1.0' Reader: 'LLVM APPLE_1_1600.0.26.6_0')', using libLTO version 'LLVM version 16.0.0' in '/opt/LLVM/20.1.0/lib/libLLVMSupport.a[32](CodeGenCoverage.cpp.o)'

Workaround

As a workaround, one can use compilers from the same package, but also have to use lld (-fuse-ld=lld), otherwise it fails with default Xcode linker (albeit for an unrelated reason):

&gt; echo "int main() { return 0; }" &gt; main.c
&gt; /opt/LLVM/20.1.0/bin/clang main.c
dyld[10373]: Symbol not found: ___cxa_demangle
  Referenced from: &lt;565CE761-C1EB-37F5-9738-E1BCF6F2EC75&gt; /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld
  Expected in:     &lt;4C4C44F0-5555-3144-A1B9-74F6D413BAC4&gt; /opt/LLVM/20.1.0/lib/libc++.1.0.dylib
clang: error: unable to execute command: Abort trap: 6
clang: error: linker command failed due to signal (use -v to see invocation)

This works though:

/opt/LLVM/20.1.0/bin/clang main.c -fuse-ld=lld

@EugeneZelenko EugeneZelenko added packaging platform:macos and removed bug Indicates an unexpected problem or unintended behavior infrastructure Bugs about LLVM infrastructure labels Mar 29, 2025
@nikic
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nikic commented Apr 4, 2025

cc @tstellar

@nikic nikic added this to the LLVM 20.X Release milestone Apr 4, 2025
@github-project-automation github-project-automation bot moved this to Needs Triage in LLVM Release Status Apr 4, 2025
@tstellar tstellar moved this from Needs Triage to Needs Fix in LLVM Release Status Apr 11, 2025
@tstellar tstellar linked a pull request May 17, 2025 that will close this issue
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[CMake][Release] Build with -ffat-lto-objects tstellar/llvm-project
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