[PATCH] Teach zorg to support cmake and modules for Clang builders

[Richard Smith]

Hi chapuni,

Adds `modules=` and `cmake=` keyword arguments to `getClangBuildFactory`. Right now, the modules build requires a two-stage cmake-based bootstrap. To use this you'll need a modularized libc and libc++ in a place where the build will find them.

My modules buildbot is configured using this builder:

         {'name' : "clang-x86_64-linux-selfhost-rel",
          'slavenames' : ["localhost"],
          'builddir' : "clang-x86_64-linux-selfhost-rel",
          'factory' : ClangBuilder.getClangBuildFactory(triple='x86_64-pc-linux-gnu',
                                               useTwoStage=True,
                                               modules=True,
                                               clean=False,
                                               stage1_config='Release+Asserts',
                                               stage2_config='Release+Asserts',
                                               extra_configure_args=[
                                                   '-DCMAKE_C_COMPILER=/var/lib/buildbot/bin/clang',
                                                   '-DCMAKE_CXX_COMPILER=/var/lib/buildbot/bin/clang++',
                                                   '-DCMAKE_CXX_FLAGS=-stdlib=libc++',
                                               ],
                                               cmake='/var/lib/buildbot/bin/cmake')},

... and seems to work.

http://reviews.llvm.org/D4936

Files:
  zorg/buildbot/builders/ClangBuilder.py
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