unsupported option -fopenmp while compiling persona-example on a mac

[Scott Baden]

The persona-example fails to compile on a mac

Darwin svamp.dhcp.lbl.gov 17.5.0 Darwin Kernel Version 17.5.0: Fri Apr 13 19:32:32 PDT 2018; root:xnu-4570.51.2~1/RELEASE_X86_64 x86_64

/usr/bin/g++ -v Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1 Apple LLVM version 9.1.0 (clang-902.0.39.1)

[Dan Bonachea]

Apple XCode does not support OpenMP.

Running hybrid UPC++/OpenMP programs like this one on Mac requires use of a non-Xcode gcc such as installed by Homebrew or Fink (which we now support in develop, not yet released).