[MacPorts] CompilerSelection modified

[MacPorts Wiki]

Page "CompilerSelection" was changed by chrstphrchvz
Diff URL: <https://trac.macports.org/wiki/CompilerSelection?action=diff&version=17>
Revision 17
Comment: Add note about -fopenmp-version
Changes:
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Index: CompilerSelection
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--- CompilerSelection (version: 16)
+++ CompilerSelection (version: 17)
@@ -74,6 +74,8 @@
 ||=      3.1       =||   [https://openmp.llvm.org 3.8]   ||    Future?    || Future? ||   [https://gcc.gnu.org/wiki/openmp  4.7]   ||
 ||=      4.0       =|| [https://openmp.llvm.org Partial] ||    Future?    || Future? ||   [https://gcc.gnu.org/wiki/openmp  4.9]   ||
 ||=      4.5       =|| [https://openmp.llvm.org Partial] ||    Future?    || Future? ||   ???   ||
+
+For LLVM Clang 3.9 through 9.0, only OpenMP 3.1 support is enabled by default; enabling OpenMP 4.0 or 4.5 support requires specifying the corresponding `-fopenmp-version=40` or `-fopenmp-version=45` flag.
 
 None of the compilers provided by Xcode implement [https://en.wikipedia.org/wiki/Message_Passing_Interface MPI].
 To implement it, [https://en.wikipedia.org/wiki/MPICH MPICH] and [https://en.wikipedia.org/wiki/Open_MPI Open MPI] provide wrappers for Clang, GCC, and Xcode.
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