[petsc-dev] OpenMP compiler options

[Jed Brown]

The OpenMP flags do not definitively identify that OpenMP is used. In
particular, IBM XL interprets Cray's option "-h omp" as being equivalent to
"-soname omp", then silently ignores the Open MP pragmas. We can perhaps
"fix" this instance by moving -qsmp up in the list, but we may eventually
need to move it to compilerOptions.py.

  def configureLibrary(self):
    ''' Checks for -fopenmp compiler flag'''
    ''' Needs to check if OpenMP actually exists and works '''
    self.setCompilers.pushLanguage('C')
    #
    for flag in ["-fopenmp", # Gnu
                 "-h omp",   # Cray
                 "-mp",      # Portland Group
                 "-Qopenmp", # Intel windows
                 "-openmp",  # Intel
                 " ",        # Empty, if compiler automatically accepts
openmp
                 "-xopenmp", # Sun
                 "+Oopenmp", # HP
                 "-qsmp",    # IBM XL C/c++
                 "/openmp"   # Microsoft Visual Studio
                 ]:
      if self.setCompilers.checkCompilerFlag(flag):
        ompflag = flag
        break
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