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annotate m4/ax_openmp.m4 @ 20830:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents ced2313b8d56
children
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1 # ===========================================================================
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2 # http://www.gnu.org/software/autoconf-archive/ax_openmp.html
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3 # ===========================================================================
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4 #
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5 # SYNOPSIS
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6 #
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7 # AX_OPENMP([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
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8 #
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9 # DESCRIPTION
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10 #
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11 # This macro tries to find out how to compile programs that use OpenMP a
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12 # standard API and set of compiler directives for parallel programming
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13 # (see http://www-unix.mcs/)
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14 #
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15 # On success, it sets the OPENMP_CFLAGS/OPENMP_CXXFLAGS/OPENMP_F77FLAGS
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16 # output variable to the flag (e.g. -omp) used both to compile *and* link
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17 # OpenMP programs in the current language.
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18 #
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19 # NOTE: You are assumed to not only compile your program with these flags,
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20 # but also link it with them as well.
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21 #
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22 # If you want to compile everything with OpenMP, you should set:
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23 #
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24 # CFLAGS="$CFLAGS $OPENMP_CFLAGS"
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25 # #OR# CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS"
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26 # #OR# FFLAGS="$FFLAGS $OPENMP_FFLAGS"
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27 #
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28 # (depending on the selected language).
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29 #
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30 # The user can override the default choice by setting the corresponding
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31 # environment variable (e.g. OPENMP_CFLAGS).
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32 #
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33 # ACTION-IF-FOUND is a list of shell commands to run if an OpenMP flag is
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34 # found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it is
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35 # not found. If ACTION-IF-FOUND is not specified, the default action will
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36 # define HAVE_OPENMP.
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37 #
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38 # LICENSE
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39 #
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40 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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41 # Copyright (c) 2015 John W. Peterson <jwpeterson@gmail.com>
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42 #
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43 # This program is free software: you can redistribute it and/or modify it
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44 # under the terms of the GNU General Public License as published by the
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45 # Free Software Foundation, either version 3 of the License, or (at your
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46 # option) any later version.
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47 #
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48 # This program is distributed in the hope that it will be useful, but
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49 # WITHOUT ANY WARRANTY; without even the implied warranty of
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50 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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51 # Public License for more details.
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52 #
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53 # You should have received a copy of the GNU General Public License along
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54 # with this program. If not, see <http://www.gnu.org/licenses/>.
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55 #
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56 # As a special exception, the respective Autoconf Macro's copyright owner
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57 # gives unlimited permission to copy, distribute and modify the configure
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58 # scripts that are the output of Autoconf when processing the Macro. You
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59 # need not follow the terms of the GNU General Public License when using
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60 # or distributing such scripts, even though portions of the text of the
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61 # Macro appear in them. The GNU General Public License (GPL) does govern
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62 # all other use of the material that constitutes the Autoconf Macro.
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63 #
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64 # This special exception to the GPL applies to versions of the Autoconf
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65 # Macro released by the Autoconf Archive. When you make and distribute a
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66 # modified version of the Autoconf Macro, you may extend this special
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67 # exception to the GPL to apply to your modified version as well.
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68
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69 #serial 11
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70
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71 AC_DEFUN([AX_OPENMP], [
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72 AC_PREREQ([2.59]) dnl for _AC_LANG_PREFIX
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73
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74 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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75 ax_cv_[]_AC_LANG_ABBREV[]_openmp=unknown
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76 # Flags to try: -fopenmp (gcc), -openmp (icc), -mp (SGI & PGI),
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77 # -xopenmp (Sun), -omp (Tru64), -qsmp=omp (AIX), none
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78 ax_openmp_flags="-fopenmp -openmp -mp -xopenmp -omp -qsmp=omp none"
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79 if test "x$OPENMP_[]_AC_LANG_PREFIX[]FLAGS" != x; then
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80 ax_openmp_flags="$OPENMP_[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flags"
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81 fi
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82 for ax_openmp_flag in $ax_openmp_flags; do
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83 case $ax_openmp_flag in
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84 none) []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[] ;;
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85 *) []_AC_LANG_PREFIX[]FLAGS="$save[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flag" ;;
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86 esac
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87 AC_LINK_IFELSE([AC_LANG_SOURCE([[
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88 @%:@include <omp.h>
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89
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90 static void
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91 parallel_fill(int * data, int n)
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92 {
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93 int i;
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94 @%:@pragma omp parallel for
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95 for (i = 0; i < n; ++i)
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96 data[i] = i;
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97 }
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98
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99 int
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100 main()
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101 {
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102 int arr[100000];
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103 omp_set_num_threads(2);
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104 parallel_fill(arr, 100000);
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105 return 0;
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106 }
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107 ]])],[ax_cv_[]_AC_LANG_ABBREV[]_openmp=$ax_openmp_flag; break],[])
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108 done
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109 []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[]FLAGS
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110 ])
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111 if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" = "xunknown"; then
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112 m4_default([$2],:)
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113 else
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114 if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" != "xnone"; then
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115 OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ax_cv_[]_AC_LANG_ABBREV[]_openmp
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116 fi
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117 m4_default([$1], [AC_DEFINE(HAVE_OPENMP,1,[Define if OpenMP is enabled])])
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118 fi
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119 ])dnl AX_OPENMP