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125 lines
4.6 KiB
Plaintext
125 lines
4.6 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_openmp.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_OPENMP([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
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#
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# DESCRIPTION
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#
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# This macro tries to find out how to compile programs that use OpenMP a
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# standard API and set of compiler directives for parallel programming
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# (see http://www-unix.mcs/)
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#
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# On success, it sets the OPENMP_CFLAGS/OPENMP_CXXFLAGS/OPENMP_F77FLAGS
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# output variable to the flag (e.g. -omp) used both to compile *and* link
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# OpenMP programs in the current language.
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#
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# NOTE: You are assumed to not only compile your program with these flags,
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# but also link it with them as well.
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#
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# If you want to compile everything with OpenMP, you should set:
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#
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# CFLAGS="$CFLAGS $OPENMP_CFLAGS"
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# #OR# CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS"
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# #OR# FFLAGS="$FFLAGS $OPENMP_FFLAGS"
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#
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# (depending on the selected language).
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#
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# The user can override the default choice by setting the corresponding
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# environment variable (e.g. OPENMP_CFLAGS).
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#
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# ACTION-IF-FOUND is a list of shell commands to run if an OpenMP flag is
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# found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it is
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# not found. If ACTION-IF-FOUND is not specified, the default action will
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# define HAVE_OPENMP.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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# Copyright (c) 2015 John W. Peterson <jwpeterson@gmail.com>
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# Copyright (c) 2016 Nick R. Papior <nickpapior@gmail.com>
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 14
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AC_DEFUN([AX_OPENMP], [
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AC_PREREQ([2.69]) dnl for _AC_LANG_PREFIX
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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
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ax_cv_[]_AC_LANG_ABBREV[]_openmp=unknown
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# Flags to try: -fopenmp (gcc), -mp (SGI & PGI),
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# -qopenmp (icc>=15), -openmp (icc),
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# -xopenmp (Sun), -omp (Tru64),
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# -qsmp=omp (AIX),
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# none
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ax_openmp_flags="-fopenmp -openmp -qopenmp -mp -xopenmp -omp -qsmp=omp none"
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if test "x$OPENMP_[]_AC_LANG_PREFIX[]FLAGS" != x; then
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ax_openmp_flags="$OPENMP_[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flags"
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fi
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for ax_openmp_flag in $ax_openmp_flags; do
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case $ax_openmp_flag in
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none) []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[] ;;
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*) []_AC_LANG_PREFIX[]FLAGS="$save[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flag" ;;
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esac
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AC_LINK_IFELSE([AC_LANG_SOURCE([[
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@%:@include <omp.h>
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static void
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parallel_fill(int * data, int n)
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{
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int i;
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@%:@pragma omp parallel for
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for (i = 0; i < n; ++i)
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data[i] = i;
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}
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int
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main(void)
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{
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int arr[100000];
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omp_set_num_threads(2);
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parallel_fill(arr, 100000);
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return 0;
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}
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]])],[ax_cv_[]_AC_LANG_ABBREV[]_openmp=$ax_openmp_flag; break],[])
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done
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[]_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[]FLAGS
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])
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if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" = "xunknown"; then
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m4_default([$2],:)
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else
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if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" != "xnone"; then
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OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ax_cv_[]_AC_LANG_ABBREV[]_openmp
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fi
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m4_default([$1], [AC_DEFINE(HAVE_OPENMP,1,[Define if OpenMP is enabled])])
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fi
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])dnl AX_OPENMP
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