[LLVMdev] LLVM 3.2 on Xcode

[Alexey Samsonov]

Hi Richard!

On Thu, Dec 20, 2012 at 12:48 AM, Nick Kledzik <kledzik at apple.com> wrote:

> Those look like the linker is being passed the same .o file built twice,
> ex:
>   ../Objects-normal/x86_64/asan_globals_test.o
>  ../lib/asan/tests/asan_globals_test.cc.asan.o
>
> So, the symbols are colliding.  Something is set up wrong in the xcode
> project.
>
> -Nick
>
> On Dec 19, 2012, at 9:48 AM, Relph, Richard wrote:
>
>  Following a blend of instructions on 3 web pages, I have succeeded in
> getting LLVM 3.2 (with clang, extras, and compiler-rt) building - but not
> testing - on Xcode. I used CMake 2.8.10 GUI to create the Xcode project
> file. Below are my notes.
>
>  First, I believe CMake ends up setting things up so that Xcode has 1
> warning after scanning the project having to do with hires images or some
> such… it takes a long time to fix that up in a project as large as this,
> but I'm not sure there's anything we can do about it.
> Second, a build of the ALL_BUILD target in Xcode produces 16 warnings
> about 8 functions declared noreturn, but without a expected
> __builtin_unreachable() before the end of the function. (The first attempt
> to build produced 2 errors, the first an unable to create directory error
> for
> runtime/libprofile/LLVM.build/Debug/profile_rt-static.build/Objects-normal/x86_64;
> the second a libtool failure… both went away upon a rebuild.)
> Third, a build of the check-all target produced 8 warnings about the 8
> functions declared noreturn as for ALL_BUILD, and 6 or 7 "errors", mostly
> from asan_mac_test.mm. After fixing up these "errors" (int vs. size_t
> comparisons and malloc being assigned to volatile pointers), I got 372
> duplicate symbol errors from this:
>
>   Ld
> /Volumes/Shared/NewShared/llvm/3.2/xcode/projects/compiler-rt/lib/asan/tests/Debug/AsanTest
> normal x86_64
>      cd /Volumes/Shared/NewShared/llvm/3.2/source
>      setenv MACOSX_DEPLOYMENT_TARGET 10.8
>
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
> -arch x86_64 -isysroot
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk
> -L/Volumes/Shared/NewShared/llvm/3.2/xcode/projects/compiler-rt/lib/asan/tests/Debug
> -F/Volumes/Shared/NewShared/llvm/3.2/xcode/projects/compiler-rt/lib/asan/tests/Debug
> -filelist
> /Volumes/Shared/NewShared/llvm/3.2/xcode/projects/compiler-rt/lib/asan/tests/LLVM.build/Debug/AsanTest.build/Objects-normal/x86_64/AsanTest.LinkFileList
> -mmacosx-version-min=10.8 -framework Foundation -Wl,-search_paths_first
> -Wl,-headerpad_max_install_names -lpthread
> /Volumes/Shared/NewShared/llvm/3.2/xcode/lib/Debug/libgtest.a
> /Volumes/Shared/NewShared/llvm/3.2/xcode/lib/Debug/libgtest_main.a
> /Volumes/Shared/NewShared/llvm/3.2/xcode/lib/Debug/libLLVMSupport.a
> /Volumes/Shared/NewShared/llvm/3.2/xcode/lib/clang/3.2/lib/darwin/Debug/libclang_rt.asan_osx.a
> /Volumes/Shared/NewShared/llvm/3.2/xcode/lib/Debug/libgtest.a
> /Volumes/Shared/NewShared/llvm/3.2/xcode/lib/Debug/libLLVMSupport.a
> -lpthread -fobjc-link-runtime
> /Volumes/Shared/NewShared/llvm/3.2/source/../xcode/projects/compiler-rt/lib/asan/tests/asan_globals_test.cc.asan.o
> /Volumes/Shared/NewShared/llvm/3.2/source/../xcode/projects/compiler-rt/lib/asan/tests/asan_test.cc.asan.o
> /Volumes/Shared/NewShared/llvm/3.2/source/../xcode/projects/compiler-rt/lib/asan/tests/asan_mac_test.mm.asan.o
> -o
> /Volumes/Shared/NewShared/llvm/3.2/xcode/projects/compiler-rt/lib/asan/tests/Debug/AsanTest
>
>  duplicate symbol __Z11GlobalsTesti in:
>
> /Volumes/Shared/NewShared/llvm/3.2/xcode/projects/compiler-rt/lib/asan/tests/LLVM.build/Debug/AsanTest.build/Objects-normal/x86_64/asan_globals_test.o
>
> /Volumes/Shared/NewShared/llvm/3.2/source/../xcode/projects/compiler-rt/lib/asan/tests/asan_globals_test.cc.asan.o
>  duplicate symbol _kStartupStr in:
>
> /Volumes/Shared/NewShared/llvm/3.2/xcode/projects/compiler-rt/lib/asan/tests/LLVM.build/Debug/AsanTest.build/Objects-normal/x86_64/asan_mac_test.o
>
> /Volumes/Shared/NewShared/llvm/3.2/source/../xcode/projects/compiler-rt/lib/asan/tests/asan_mac_test.mm.asan.o
>  and 370 more…
>
> Recently the way we build ASan unit tests has changed. Could you please
check if your XCode build works for the trunk?

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-- 
Alexey Samsonov, MSK
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