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