[llvm-dev] Building LLVM 3.7.1 on OS X

[Jack Howarth via llvm-dev]

Antoine,
      The llvm 3.7.1 build requires Apple Clang 5.0 or later which can
be gotten from Xcode 5.1 on 10.8. In general, it is best to keep your
OS X upgraded to the latest release supported on the hardware for
building llvm. For example, llvm 3.8 currently requires Xcode 7
(available on OS X 10.10 or 10.11) in order to build the new tsan
support in compiler-rt or using
-DLLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL=ON to use the just built
compiler.
               Jack

On Mon, Jan 25, 2016 at 11:22 AM, Antoine Pitrou via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Hello,
>
> I haven't found any relevant info in the docs about this. I'm trying to
> build LLVM 3.7.1 on OS X but it fails in the configuration phase. Here
> are the relevant parts of the output:
>
> $ cmake -DCMAKE_INSTALL_PREFIX=/Volumes/HD2/jenkins/workspace/LLVMDev/label/osxbuild/miniconda/envs/_build -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=host -DLLVM_INCLUDE_TESTS=OFF -DLLVM_INCLUDE_UTILS=OFF -DLLVM_INCLUDE_DOCS=OFF -DLLVM_INCLUDE_EXAMPLES=OFF ..
> -- The C compiler identification is AppleClang 4.1.0.4211166
> -- The CXX compiler identification is AppleClang 4.1.0.4211166
> [...]
> -- Looking for __atomic_fetch_add_4 in atomic
> -- Looking for __atomic_fetch_add_4 in atomic - not found
> CMake Error at cmake/modules/CheckAtomic.cmake:36 (message):
>   Host compiler appears to require libatomic, but cannot find it.
> Call Stack (most recent call first):
>   cmake/config-ix.cmake:291 (include)
>   CMakeLists.txt:360 (include)
>
>
> How is libatomic supposed to be installed on OS X?
> (perhaps it's somewhat of a newbie question - I'm not a OS X user...)
>
> Thank you,
>
> Antoine.
>
>
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