|
Chris@82
|
1 dnl @synopsis AX_OPENMP([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
|
|
Chris@82
|
2 dnl @summary determine how to compile programs using OpenMP
|
|
Chris@82
|
3 dnl @category InstalledPackages
|
|
Chris@82
|
4 dnl
|
|
Chris@82
|
5 dnl This macro tries to find out how to compile programs that
|
|
Chris@82
|
6 dnl use OpenMP, a standard API and set of compiler directives for
|
|
Chris@82
|
7 dnl parallel programming (see http://www.openmp.org/).
|
|
Chris@82
|
8 dnl
|
|
Chris@82
|
9 dnl On success, it sets the OPENMP_CFLAGS/OPENMP_CXXFLAGS/OPENMP_FFLAGS
|
|
Chris@82
|
10 dnl output variable to the flag (e.g. -omp) used both to compile *and* link
|
|
Chris@82
|
11 dnl OpenMP programs in the current language.
|
|
Chris@82
|
12 dnl
|
|
Chris@82
|
13 dnl NOTE: You are assumed to not only compile your program with these
|
|
Chris@82
|
14 dnl flags, but also link it with them as well.
|
|
Chris@82
|
15 dnl
|
|
Chris@82
|
16 dnl If you want to compile everything with OpenMP, you should set:
|
|
Chris@82
|
17 dnl
|
|
Chris@82
|
18 dnl CFLAGS="$CFLAGS $OPENMP_CFLAGS"
|
|
Chris@82
|
19 dnl #OR# CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS"
|
|
Chris@82
|
20 dnl #OR# FFLAGS="$FFLAGS $OPENMP_FFLAGS"
|
|
Chris@82
|
21 dnl
|
|
Chris@82
|
22 dnl (depending on the selected language).
|
|
Chris@82
|
23 dnl
|
|
Chris@82
|
24 dnl The user can override the default choice by setting the corresponding
|
|
Chris@82
|
25 dnl environment variable (e.g. OPENMP_CFLAGS).
|
|
Chris@82
|
26 dnl
|
|
Chris@82
|
27 dnl ACTION-IF-FOUND is a list of shell commands to run if an OpenMP
|
|
Chris@82
|
28 dnl flag is found, and ACTION-IF-NOT-FOUND is a list of commands
|
|
Chris@82
|
29 dnl to run it if it is not found. If ACTION-IF-FOUND is not specified,
|
|
Chris@82
|
30 dnl the default action will define HAVE_OPENMP.
|
|
Chris@82
|
31 dnl
|
|
Chris@82
|
32 dnl @version 2006-11-20
|
|
Chris@82
|
33 dnl @license GPLWithACException
|
|
Chris@82
|
34 dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
|
|
Chris@82
|
35
|
|
Chris@82
|
36 AC_DEFUN([AX_OPENMP], [
|
|
Chris@82
|
37 AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
|
|
Chris@82
|
38
|
|
Chris@82
|
39 AC_CACHE_CHECK([for OpenMP flag of _AC_LANG compiler], ax_cv_[]_AC_LANG_ABBREV[]_openmp, [save[]_AC_LANG_PREFIX[]FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
|
|
Chris@82
|
40 ax_cv_[]_AC_LANG_ABBREV[]_openmp=unknown
|
|
Chris@82
|
41 # Flags to try: -fopenmp (gcc), -openmp (icc), -mp (SGI & PGI),
|
|
Chris@82
|
42 # -xopenmp (Sun), -omp (Tru64), -qsmp=omp (AIX), none
|
|
Chris@82
|
43 ax_openmp_flags="-fopenmp -openmp -mp -xopenmp -omp -qsmp=omp none"
|
|
Chris@82
|
44 if test "x$OPENMP_[]_AC_LANG_PREFIX[]FLAGS" != x; then
|
|
Chris@82
|
45 ax_openmp_flags="$OPENMP_[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flags"
|
|
Chris@82
|
46 fi
|
|
Chris@82
|
47 for ax_openmp_flag in $ax_openmp_flags; do
|
|
Chris@82
|
48 case $ax_openmp_flag in
|
|
Chris@82
|
49 none) []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[] ;;
|
|
Chris@82
|
50 *) []_AC_LANG_PREFIX[]FLAGS="$save[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flag" ;;
|
|
Chris@82
|
51 esac
|
|
Chris@82
|
52 AC_TRY_LINK_FUNC(omp_set_num_threads,
|
|
Chris@82
|
53 [ax_cv_[]_AC_LANG_ABBREV[]_openmp=$ax_openmp_flag; break])
|
|
Chris@82
|
54 done
|
|
Chris@82
|
55 []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[]FLAGS
|
|
Chris@82
|
56 ])
|
|
Chris@82
|
57 if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" = "xunknown"; then
|
|
Chris@82
|
58 m4_default([$2],:)
|
|
Chris@82
|
59 else
|
|
Chris@82
|
60 if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" != "xnone"; then
|
|
Chris@82
|
61 OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ax_cv_[]_AC_LANG_ABBREV[]_openmp
|
|
Chris@82
|
62 fi
|
|
Chris@82
|
63 m4_default([$1], [AC_DEFINE(HAVE_OPENMP,1,[Define if OpenMP is enabled])])
|
|
Chris@82
|
64 fi
|
|
Chris@82
|
65 AC_SUBST(OPENMP_[]_AC_LANG_PREFIX[]FLAGS)
|
|
Chris@82
|
66 ])dnl AX_OPENMP
|
