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1 dnl @synopsis AX_OPENMP([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
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2 dnl @summary determine how to compile programs using OpenMP
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3 dnl @category InstalledPackages
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4 dnl
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5 dnl This macro tries to find out how to compile programs that
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6 dnl use OpenMP, a standard API and set of compiler directives for
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7 dnl parallel programming (see http://www.openmp.org/).
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8 dnl
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9 dnl On success, it sets the OPENMP_CFLAGS/OPENMP_CXXFLAGS/OPENMP_FFLAGS
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10 dnl output variable to the flag (e.g. -omp) used both to compile *and* link
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11 dnl OpenMP programs in the current language.
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12 dnl
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13 dnl NOTE: You are assumed to not only compile your program with these
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14 dnl flags, but also link it with them as well.
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15 dnl
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16 dnl If you want to compile everything with OpenMP, you should set:
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17 dnl
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18 dnl CFLAGS="$CFLAGS $OPENMP_CFLAGS"
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19 dnl #OR# CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS"
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20 dnl #OR# FFLAGS="$FFLAGS $OPENMP_FFLAGS"
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21 dnl
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22 dnl (depending on the selected language).
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23 dnl
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24 dnl The user can override the default choice by setting the corresponding
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25 dnl environment variable (e.g. OPENMP_CFLAGS).
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26 dnl
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27 dnl ACTION-IF-FOUND is a list of shell commands to run if an OpenMP
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28 dnl flag is found, and ACTION-IF-NOT-FOUND is a list of commands
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29 dnl to run it if it is not found. If ACTION-IF-FOUND is not specified,
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30 dnl the default action will define HAVE_OPENMP.
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31 dnl
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32 dnl @version 2006-11-20
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33 dnl @license GPLWithACException
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34 dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
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35
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36 AC_DEFUN([AX_OPENMP], [
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37 AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
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38
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39 AC_CACHE_CHECK([for OpenMP flag of _AC_LANG compiler], ax_cv_[]_AC_LANG_ABBREV[]_openmp, [save[]_AC_LANG_PREFIX[]FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
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40 ax_cv_[]_AC_LANG_ABBREV[]_openmp=unknown
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41 # Flags to try: -fopenmp (gcc), -openmp (icc), -mp (SGI & PGI),
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42 # -xopenmp (Sun), -omp (Tru64), -qsmp=omp (AIX), none
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43 ax_openmp_flags="-fopenmp -openmp -mp -xopenmp -omp -qsmp=omp none"
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44 if test "x$OPENMP_[]_AC_LANG_PREFIX[]FLAGS" != x; then
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45 ax_openmp_flags="$OPENMP_[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flags"
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46 fi
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47 for ax_openmp_flag in $ax_openmp_flags; do
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48 case $ax_openmp_flag in
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49 none) []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[] ;;
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50 *) []_AC_LANG_PREFIX[]FLAGS="$save[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flag" ;;
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51 esac
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52 AC_TRY_LINK_FUNC(omp_set_num_threads,
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53 [ax_cv_[]_AC_LANG_ABBREV[]_openmp=$ax_openmp_flag; break])
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54 done
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55 []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[]FLAGS
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56 ])
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57 if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" = "xunknown"; then
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58 m4_default([$2],:)
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59 else
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60 if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" != "xnone"; then
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61 OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ax_cv_[]_AC_LANG_ABBREV[]_openmp
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62 fi
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63 m4_default([$1], [AC_DEFINE(HAVE_OPENMP,1,[Define if OpenMP is enabled])])
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64 fi
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65 AC_SUBST(OPENMP_[]_AC_LANG_PREFIX[]FLAGS)
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66 ])dnl AX_OPENMP
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