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# ===========================================================================

#         http://www.gnu.org/software/autoconf-archive/ax_openmp.html

# ===========================================================================

#

# SYNOPSIS

#

#   AX_OPENMP([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])

#

# DESCRIPTION

#

#   This macro tries to find out how to compile programs that use OpenMP a

#   standard API and set of compiler directives for parallel programming

#   (see http://www-unix.mcs/)

#

#   On success, it sets the OPENMP_CFLAGS/OPENMP_CXXFLAGS/OPENMP_F77FLAGS

#   output variable to the flag (e.g. -omp) used both to compile *and* link

#   OpenMP programs in the current language.

#

#   NOTE: You are assumed to not only compile your program with these flags,

#   but also link it with them as well.

#

#   If you want to compile everything with OpenMP, you should set:

#

#     CFLAGS="$CFLAGS $OPENMP_CFLAGS"

#     #OR#  CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS"

#     #OR#  FFLAGS="$FFLAGS $OPENMP_FFLAGS"

#

#   (depending on the selected language).

#

#   The user can override the default choice by setting the corresponding

#   environment variable (e.g. OPENMP_CFLAGS).

#

#   ACTION-IF-FOUND is a list of shell commands to run if an OpenMP flag is

#   found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it is

#   not found. If ACTION-IF-FOUND is not specified, the default action will

#   define HAVE_OPENMP.

#

# LICENSE

#

#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>

#

#   This program is free software: you can redistribute it and/or modify it

#   under the terms of the GNU General Public License as published by the

#   Free Software Foundation, either version 3 of the License, or (at your

#   option) any later version.

#

#   This program is distributed in the hope that it will be useful, but

#   WITHOUT ANY WARRANTY; without even the implied warranty of

#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

#   Public License for more details.

#

#   You should have received a copy of the GNU General Public License along

#   with this program. If not, see <http://www.gnu.org/licenses/>.

#

#   As a special exception, the respective Autoconf Macro's copyright owner

#   gives unlimited permission to copy, distribute and modify the configure

#   scripts that are the output of Autoconf when processing the Macro. You

#   need not follow the terms of the GNU General Public License when using

#   or distributing such scripts, even though portions of the text of the

#   Macro appear in them. The GNU General Public License (GPL) does govern

#   all other use of the material that constitutes the Autoconf Macro.

#

#   This special exception to the GPL applies to versions of the Autoconf

#   Macro released by the Autoconf Archive. When you make and distribute a

#   modified version of the Autoconf Macro, you may extend this special

#   exception to the GPL to apply to your modified version as well.

#serial 8

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

])dnl AX_OPENMP