问题
I have a proprietary library (>150,000 lines) of quantum mechanics C++ code that relies on OpenMP for parallisation. This code used to compile fine with Xcode 4.6 and its' real GCC compiler, but the LLVM compiler that ships with Xcode 5 doesn't seem to support OpenMP. My code is developed on a Mac but needs to be portable to non-Apple hardware such as massively parallel supercomputers, so re-writing the code is not an option. Does anyone know of a suitable compiler that can be used? Many thanks for any help.
回答1:
I come back from my comment as I tested hpc.sourceforge.net and it is working like a charm for me.
Simply untar the archive as explained:
sudo tar -xvf gcc-4.8-bin.tar -C /
Update your .profile to use by default the hpc compiled version of gcc if you want.
Compile your program with option -fopenmp then link it with option -lgomp.
回答2:
"Does anyone know of a suitable compiler that can be used?"
The Intel compilers on MacOS support OpenMP, as they do on other platforms. http://software.intel.com/en-us/intel-software-development-products-for-mac-os-x
Of course, they cost money, but they may be worth it.
(Full disclosure: I work for Intel on the OpenMP runtime used by the compiler)
回答3:
See Clang + OpenMP Setup in Xcode. The steps are basically:
- Install Homebrew.
- Install llvm with
brew install llvm. - “Build Settings” and then “Editor” » “Add Build Setting” » “Add User-Defined Setting” with key of
CCand value of/usr/local/opt/llvm/bin/clang. - Search for “Enable Modules” and turn that off.
- Add
/usr/local/opt/llvm/libto “Library Search Paths”. - Add
/usr/local/opt/llvm/lib/clang/7.0.1/includeto “Header Search Paths”. (The version number may vary based upon your installation.) - Add
-fopenmpcompilation flag to “Other C Flags”. - Turn off “Enable Index-While-Building Functionality”.
- Add
/usr/local/opt/llvm/lib/libiomp5.dylibto “Build Phases” » “Link Binary with Libraries”.
来源：https://stackoverflow.com/questions/19208281/openmp-support-in-xcode-5-and-later