Updates

fftw-3.3.10/m4/ax_openmp.m4

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+dnl @synopsis AX_OPENMP([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+dnl @summary determine how to compile programs using OpenMP
+dnl @category InstalledPackages
+dnl
+dnl This macro tries to find out how to compile programs that
+dnl use OpenMP, a standard API and set of compiler directives for
+dnl parallel programming (see http://www.openmp.org/).
+dnl
+dnl On success, it sets the OPENMP_CFLAGS/OPENMP_CXXFLAGS/OPENMP_FFLAGS
+dnl output variable to the flag (e.g. -omp) used both to compile *and* link
+dnl OpenMP programs in the current language.
+dnl
+dnl NOTE: You are assumed to not only compile your program with these
+dnl flags, but also link it with them as well.
+dnl
+dnl If you want to compile everything with OpenMP, you should set:
+dnl
+dnl     CFLAGS="$CFLAGS $OPENMP_CFLAGS" 
+dnl     #OR#  CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS" 
+dnl     #OR#  FFLAGS="$FFLAGS $OPENMP_FFLAGS" 
+dnl
+dnl (depending on the selected language).
+dnl
+dnl The user can override the default choice by setting the corresponding
+dnl environment variable (e.g. OPENMP_CFLAGS).
+dnl
+dnl ACTION-IF-FOUND is a list of shell commands to run if an OpenMP
+dnl flag is found, and ACTION-IF-NOT-FOUND is a list of commands
+dnl to run it if it is not found.  If ACTION-IF-FOUND is not specified,
+dnl the default action will define HAVE_OPENMP.
+dnl
+dnl @version 2006-11-20
+dnl @license GPLWithACException
+dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
+
+AC_DEFUN([AX_OPENMP], [
+AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
+
+AC_CACHE_CHECK([for OpenMP flag of _AC_LANG compiler], ax_cv_[]_AC_LANG_ABBREV[]_openmp, [save[]_AC_LANG_PREFIX[]FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
+ax_cv_[]_AC_LANG_ABBREV[]_openmp=unknown
+# Flags to try:  -fopenmp (gcc), -openmp (icc), -mp (SGI & PGI),
+#                -xopenmp (Sun), -omp (Tru64), -qsmp=omp (AIX), none
+ax_openmp_flags="-fopenmp -openmp -mp -xopenmp -omp -qsmp=omp none"
+if test "x$OPENMP_[]_AC_LANG_PREFIX[]FLAGS" != x; then
+  ax_openmp_flags="$OPENMP_[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flags"
+fi
+for ax_openmp_flag in $ax_openmp_flags; do
+  case $ax_openmp_flag in
+    none) []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[] ;;
+    *) []_AC_LANG_PREFIX[]FLAGS="$save[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flag" ;;
+  esac
+  AC_TRY_LINK_FUNC(omp_set_num_threads,
+	[ax_cv_[]_AC_LANG_ABBREV[]_openmp=$ax_openmp_flag; break])
+done
+[]_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[]FLAGS
+])
+if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" = "xunknown"; then
+  m4_default([$2],:)
+else
+  if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" != "xnone"; then
+    OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ax_cv_[]_AC_LANG_ABBREV[]_openmp
+  fi
+  m4_default([$1], [AC_DEFINE(HAVE_OPENMP,1,[Define if OpenMP is enabled])])
+fi
+AC_SUBST(OPENMP_[]_AC_LANG_PREFIX[]FLAGS)
+])dnl AX_OPENMP