152641 2016-01-01 14:53:02 -0800 [GTK][OSX] webkit-gtk 2.11.2 fails to link libllvmForJSC.dylib on OS X due to duplicate (local) abort and raise symbols 2016-01-16 21:26:18 -0800 1 1 1 Unclassified WebKit JavaScriptCore Safari 9 Unspecified Unspecified RESOLVED WONTFIX https://llvm.org/bugs/show_bug.cgi?id=26174 P2 Normal --- 126492 1 jeremyhu webkit-unassigned bugs-noreply mcatanzaro philip.chimento oldest_to_newest 1151863 0 jeremyhu 2016-01-01 14:53:02 -0800 After working around bug #152640, linking libllvmForJSC.dylib fails with: [ 1%] Linking CXX shared library ../../lib/libllvmForJSC.dylib cd /opt/local/var/macports/build/_Volumes_Home_jeremy_src_macports_trunk_dports_www_webkit-gtk-devel/webkit-gtk-devel/work/webkitgtk-2.11.2/Source/JavaScriptCore && /opt/local/bin/cmake -E cmake_link_script CMakeFiles/llvmForJSC.dir/link.txt --verbose=1 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -pipe -O0 -g3 -ftemplate-depth=256 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/opt/local/libexec/llvm-3.7/lib/libLLVMScalarOpts.a /opt/local/libexec/llvm-3.7/lib/libLLVMProfileData.a /opt/local/libexec/llvm-3.7/lib/libLLVMObject.a /opt/local/libexec/llvm-3.7/lib/libLLVMMCParser.a /opt/local/libexec/llvm-3.7/lib/libLLVMBitReader.a /opt/local/libexec/llvm-3.7/lib/libLLVMInstCombine.a /opt/local/libexec/llvm-3.7/lib/libLLVMInstrumentation.a /opt/local/libexec/llvm-3.7/lib/libLLVMTransformUtils.a /opt/local/libexec/llvm-3.7/lib/libLLVMipa.a /opt/local/libexec/llvm-3.7/lib/libLLVMMC.a /opt/local/libexec/llvm-3.7/lib/libLLVMAnalysis.a /opt/local/libexec/llvm-3.7/lib/libLLVMCore.a /opt/local/libexec/llvm-3.7/lib/libLLVMSupport.a -lz -lpthread -lffi -ledit -lcurses -lm -Wl,-rpath,/opt/local/lib duplicate symbol _abort in: CMakeFiles/llvmForJSC.dir/llvm/library/LLVMOverrides.cpp.o /opt/local/libexec/llvm-3.7/lib/libLLVMSupport.a(Signals.o) duplicate symbol _raise in: CMakeFiles/llvmForJSC.dir/llvm/library/LLVMOverrides.cpp.o /opt/local/libexec/llvm-3.7/lib/libLLVMSupport.a(Signals.o) ld: 2 duplicate symbols for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) 1156187 1 jeremyhu 2016-01-16 10:13:47 -0800 Some history here... the llvm-provided definitions are conditional on: #if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES) The llvm ones are there to redefine raise() as: return pthread_kill(pthread_self(), sig); compared to the system definition as: return(kill(getpid(), s)); --- The wording of the comment around this is: // On Darwin, raise sends a signal to the main thread instead of the current // thread. This has the unfortunate effect that assert() and abort() will end up // bypassing our crash recovery attempts. We work around this for anything in // the same linkage unit by just defining our own versions of the assert handler // and abort. While raise() does behave as described, I changed the behavior of abort() in Lion (10.7) to use pthread_kill() instead of raise(). I think it best to handle removal of the llvm overrides, and I'll file a bug at llvm.org for that. Additionally, libllvmForJSC.dylib is linking in the static archive directly instead of libLLVM-3.7.dylib. Again, this isn't a bug in webkit as it is just doing what llvm-config --libs instructs it to. I'll file a bug at llvm.org for that as well. Given the above, do we want to add a workaround in webkit or detect the problem during configure? 1156229 2 mcatanzaro 2016-01-16 15:22:03 -0800 (In reply to comment #1) > Additionally, libllvmForJSC.dylib is linking in the static archive directly > instead of libLLVM-3.7.dylib. Again, this isn't a bug in webkit as it is > just doing what llvm-config --libs instructs it to. I'll file a bug at > llvm.org for that as well. We added a workaround so that we could dynamic link to LLVM right after the 2.11.3 release: http://trac.webkit.org/changeset/195009 Try it out! 1156259 3 jeremyhu 2016-01-16 21:26:18 -0800 Ok, given that, I think we can close this out.