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Bug 1494216 - Use the -Bsymbolic-functions linker flag to build clang. r=froydnj

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With libLLVM being a shared library exporting many symbols, all internal
calls using those symbols default to go through the PLT, which is
unnecessary (and costly) overhead. Using -Bsymbolic-functions makes
internal calls go directly to the right place without going through the
PLT.

Differential Revision: https://phabricator.services.mozilla.com/D7029
This commit is contained in:
Mike Hommey
2018-09-27 08:19:41 +09:00
parent 9cd7f77b0a
commit d3d77c7563
1 changed files with 2 additions and 1 deletions
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3
build/build-clang/build-clang.py
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@@ -616,7 +616,8 @@ if __name__ == "__main__":
# Silence clang's warnings about arguments not being used in compilation. # Silence clang's warnings about arguments not being used in compilation.
extra_cxxflags2 = ["-fPIC", '-Qunused-arguments'] extra_cxxflags2 = ["-fPIC", '-Qunused-arguments']
extra_asmflags = [] extra_asmflags = []
extra_ldflags = [] # Avoid libLLVM internal function calls going through the PLT.
extra_ldflags = ['-Wl,-Bsymbolic-functions']
if 'LD_LIBRARY_PATH' in os.environ: if 'LD_LIBRARY_PATH' in os.environ:
os.environ['LD_LIBRARY_PATH'] = ('%s/lib64/:%s' % os.environ['LD_LIBRARY_PATH'] = ('%s/lib64/:%s' %