https://llvm.org/bugs/show_bug.cgi?id=31782
Bug ID: 31782
Summary: Linking against macOS prebuilt binaries causes linker
warnings around std::__1::__call_once_proxy
Product: libraries
Version: 4.0
Hardware: Macintosh
URL: https://github.com/zneak/fcd/tree/llvm-4.0
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Core LLVM classes
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Blocks: 31622
Classification: Unclassified
I've upgraded a project (see bug URL) to LLVM 4.0. It seems to work, but I get
over 200 linker warnings of the following format:
> ld: warning: direct access in function
> 'llvm::initializeExternalAAWrapperPassPass(llvm::PassRegistry&)' from file
> '/Users/.../Projets/clang+llvm-4.0.0-rc1-x86_64-apple-darwin/lib/libLLVMAnalysis.a(AliasAnalysis.cpp.o)'
> to global weak symbol 'void
> std::__1::__call_once_proxy<std::__1::tuple<void* (&)(llvm::PassRegistry&),
> std::__1::reference_wrapper<llvm::PassRegistry>&&> >(void*)' from file
> '/Users/.../Library/Developer/Xcode/DerivedData/fcd-aagtzwcwgbftbkcrfnkqbgvqpfbm/Build/Intermediates/.../Objects-normal/x86_64/foo.o'
> means the weak symbol cannot be overridden at runtime. This was likely
> caused by different translation units being compiled with different
> visibility settings.
The constant is __call_once_proxy.
I am building my project using the libc++ version that ships with Xcode 8.2.1.
The project didn't have any of these warnings when linking against the prebuilt
LLVM 3.9.
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