[cfe-dev] Built Mavericks libclang.dylib Won't Link Out clang::FileManager

[support@goldencivet]

Hey there.

So after an apparently successful vanilla trunk build on Mavericks [--enable-libcpp --enable-keep-symbols] a trivial main instantiating FileManager fails to link out against libclang.dylib.

The xcodebuild link:

XCODE_DEV/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot XCODE_DEV/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -LTRIVIAL/Build/Products/Debug -LLLVM_PROJECT/llvm/projects/libcxx/lib -LLLVM_PROJECT/build/Debug+Asserts/lib -FTRIVIAL/Build/Products/Debug -filelist TRIVIAL/Build/Intermediates/Objects-normal/x86_64/TRIVIAL.LinkFileList -mmacosx-version-min=10.9 -nostdlib -stdlib=libc++ -fobjc-link-runtime -lc++.1 -lSystem -framework Foundation -framework AppKit -Xlinker -dependency_info -Xlinker TRIVIAL/Build/Intermediates/Objects-normal/x86_64/TRIVIAL_dependency_info.dat -o TRIVIAL/Build/Products/Debug/TRIVIAL

Fails to find FileManager's constructor:

Undefined symbols for architecture x86_64:
  "clang::FileManager::FileManager(clang::FileSystemOptions const&)", referenced from: _main in main.o
ld: symbol(s) not found for architecture x86_64

Which mangled is:

$ nm main.o | egrep clang11FileManagerC                  
                 U __ZN5clang11FileManagerC1ERKNS_17FileSystemOptionsE

Where things get vexing is that the dylib apparently defines it as expected:

$ nm libclang.dylib | egrep __ZN5clang11FileManagerC1ERKNS_17FileSystemOptionsE
0000000000e3bf00 t __ZN5clang11FileManagerC1ERKNS_17FileSystemOptionsE

Presumably in its role as "umbrella" over libclangBasic.a:

nm libclangBasic.a | egrep __ZN5clang11FileManagerC1ERKNS_17FileSystemOptionsE
0000000000000060 T __ZN5clang11FileManagerC1ERKNS_17FileSystemOptionsE
0000000000068a58 S __ZN5clang11FileManagerC1ERKNS_17FileSystemOptionsE.eh

So why ain't it found?

ld's link (as opposed to runtime) decision-making is pretty opaque. There didn't seem to be any way to get more verbose detail on how the dylib might be "failing."

Any suggestions?

Thanks!