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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.
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The default C compiler on macOS, Apple clang (confusingly aliased as /usr/bin/gcc ), does not directly support OpenMP.
Flang supports parsing of all OpenMP 4.5 constructs and a few OpenMP 5.0 constructs/clauses. Semantic checks and code generation of OpenMP 4.5 and 5.0 constructs are in progress. Read More. The Microsoft Visual C/C++ compiler supports the OpenMP 2.0 standard with the -openmp switch.
Both OpenMP and OpenACC are supported with GCC's C, C++ and Fortran compilers.
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.
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"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)
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