m4/ax_check_openmp.m4

   1 # Check if $CC supports openmp.
   2 # While clang (3.5) accepts the -fopenmp flag, it produces bad code
   3 # on some PolyBench benchmarks, so it is blacklisted.
   4 AC_DEFUN([AX_CHECK_OPENMP], [
   5         AC_SUBST(HAVE_OPENMP)
   6         HAVE_OPENMP=no
   7         AC_MSG_CHECKING([for OpenMP support by $CC])
   8         echo | $CC -x c - -fsyntax-only -fopenmp -Werror >/dev/null 2>/dev/null
   9         if test $? -eq 0; then
  10                 HAVE_OPENMP=yes
  11         fi
  12         AC_MSG_RESULT($HAVE_OPENMP)
  13         if test $HAVE_OPENMP = yes; then
  14                 $CC --version | grep clang > /dev/null
  15                 if test $? -eq 0; then
  16                         AC_MSG_NOTICE([clang blacklisted])
  17                         HAVE_OPENMP=no
  18                 fi
  19         fi
  20 ])