Can't compile on latest master, "ld: library not found for -lc++"

[hb...@webrtc.org]

Hi,

I did a gclient sync on the latest master yesterday on my macbook, and since then I can't compile, getting the following error for whatever target it is trying to link:

[2/2185] LINK ./genstring

FAILED: genstring 

export DEVELOPER_DIR=/Users/hbos/workspace/webrtc_ios/src/build/mac_files/Xcode.app;  TOOL_VERSION=1478813669 ../../build/toolchain/mac/linker_driver.py /Users/hbos/goma/gomacc ../../third_party/llvm-build/Release+Asserts/bin/clang++  -stdlib=libc++ -arch x86_64 -isysroot /Users/hbos/workspace/webrtc_ios/src/chromium/src/build/mac_files/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -mmacosx-version-min=10.9 -Wl,-ObjC -Wl,-rpath,@loader_path/. -Wl,-rpath,@loader_path/../../.. -Wl,-pie -o "./genstring" -Wl,-filelist,"./genstring.rsp"  

ld: library not found for -lc++

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Traceback (most recent call last):

  File "../../build/toolchain/mac/linker_driver.py", line 229, in <module>

    Main(sys.argv)

  File "../../build/toolchain/mac/linker_driver.py", line 79, in Main

    subprocess.check_call(compiler_driver_args)

  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 540, in check_call

    raise CalledProcessError(retcode, cmd)

subprocess.CalledProcessError: Command '['/Users/hbos/goma/gomacc', '../../third_party/llvm-build/Release+Asserts/bin/clang++', '-stdlib=libc++', '-arch', 'x86_64', '-isysroot', '/Users/hbos/workspace/webrtc_ios/src/chromium/src/build/mac_files/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk', '-mmacosx-version-min=10.9', '-Wl,-ObjC', '-Wl,-rpath,@loader_path/.', '-Wl,-rpath,@loader_path/../../..', '-Wl,-pie', '-o', './genstring', '-Wl,-filelist,./genstring.rsp']' returned non-zero exit status 1

I've tried updating Xcode (in app store, maybe that's not what this uses?), clearing the out directory and fetching a fresh copy of webrtc, compiling with or without goma, same problem every time.

I don't have this problem on the latest branch on a chromium checkout.

If I checkout a branch that's a few days old and do gclient sync I can compile again. For now I can gclient sync on an old branch and continue working on the latest, but that's not going to work for very long.

Does anyone else have this problem? Know how to fix? I'm not sure what to do.

Henrik

[kthel...@webrtc.org]

What version of macOS and XCode are you using? 

[hb...@webrtc.org]

macOS Sierra 10.12.1 and Xcode 8.1

Note that I updated these things when compiling started failing (same problem before and after), so it's not specific to these versions per-se but it might still be specific to recent versions.

[kthel...@webrtc.org]

Ah, this is due to the hermetic toolchain thing that recently landed in chromium. Add "use_system_xcode = true" to your gn args.

On Friday, November 11, 2016 at 10:29:05 AM UTC+1, hb...@webrtc.org wrote:

[Henrik Kjellander]

I've filed https://bugs.chromium.org/p/webrtc/issues/detail?id=6700 to track this. Notice that it only affects Googlers.

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[hb...@webrtc.org]

Thanks! Glad that the problem is being worked on and "use_system_xcode = true" works in the meantime :)

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[Henrik Kjellander]

I think this was fixed in https://codereview.webrtc.org/2496113002 (now use_system_xcode=true becomes the default for standalone WebRTC builds).

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