WebRTC build error on Mac

[henry xing]

Hi,
     I am newbie using webrtc. When I build the Webrtc, I got a linking problem.
     The build command is below:
     ninja -C out/Default
     The build error context:

     ninja: Entering directory `out/Default'
[263/2512] LINK ./genmacro
FAILED: genmacro
TOOL_VERSION=1494398103 ../../build/toolchain/mac/linker_driver.py ../../third_party/llvm-build/Release+Asserts/bin/clang++  -stdlib=libc++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.9 -Wl,-ObjC -Wl,-pie -Werror -o "./genmacro" -Wl,-filelist,"./genmacro.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 '['../../third_party/llvm-build/Release+Asserts/bin/clang++', '-stdlib=libc++', '-arch', 'x86_64', '-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk', '-mmacosx-version-min=10.9', '-Wl,-ObjC', '-Wl,-pie', '-Werror', '-o', './genmacro', '-Wl,-filelist,./genmacro.rsp']' returned non-zero exit status 1
    
     The c++ lib is installed in my system. What's the problem?
     Thanks for you help.
Henry.

[Henrik Kjellander]

Please share the details about what OS version and Xcode version you have together with the command line you used to run GN to produce the ninja files in out/Default.

And which WebRTC version you're building, is this an up-to-date master branch?

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[Henrik Kjellander]

[henry xing]

Xcode 8.3.1
Build version 8E1000a

OSX Version: 10.12 macOS Sierra

Command line to generate ninja file: gn gen out/Default

在 2017年5月17日星期三 UTC+8上午4:35:40，Henrik Kjellander写道：

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[Henrik Kjellander]

I suspect you may have another version of ld or another toolchain related executable in your PATH.

Please share your PATH and let us know if you have anything installed with MacPorts or Homebrew. 

See https://groups.google.com/d/msg/discuss-webrtc/LsR8BTkXmK4/AVnYYD1CAgAJ for a similar case.

[henry xing]

Yes，That's the problem.
I reset the PATH variable, then the ld tool path change to /usr/bin/ld, which the path is /opt/local/bin/ld before.
Now I'm glad that I can build webrtc sucessfully.
Thank you Henrik. Thanks.

在 2017年6月15日星期四 UTC+8下午7:18:08，Henrik Kjellander写道：