Mercurial > hg > octave-lojdl > gnulib-hg
changeset 8874:d0bb3e532814
New module 'openmp'.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 27 May 2007 21:00:32 +0000 |
| parents | 25ee90a28a16 |
| children | 736b37ab3c5b |
| files | ChangeLog m4/openmp.m4 modules/openmp |
| diffstat | 3 files changed, 122 insertions(+), 0 deletions(-) [+] |
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--- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2007-05-27 Bruno Haible <bruno@clisp.org> + + * modules/openmp: New file. + * m4/openmp.m4: New file, taken from autoconf's CVS with changes by + Noah Misch. + 2007-05-26 Bruno Haible <bruno@clisp.org> * modules/chdir-long (Depends-on): Add fchdir.
new file mode 100644 --- /dev/null +++ b/m4/openmp.m4 @@ -0,0 +1,92 @@ +# openmp.m4 serial 4 +dnl Copyright (C) 2006-2007 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +dnl This file can be removed once we assume autoconf >= 2.62. + +# _AC_LANG_OPENMP +# --------------- +# Expands to some language dependent source code for testing the presence of +# OpenMP. +AC_DEFUN([_AC_LANG_OPENMP], +[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + +# _AC_LANG_OPENMP(C) +# ------------------ +m4_define([_AC_LANG_OPENMP(C)], +[ +#ifndef _OPENMP + choke me +#endif +#include <omp.h> +int main () { return omp_get_num_threads (); } +]) + +# _AC_LANG_OPENMP(C++) +# -------------------- +m4_copy([_AC_LANG_OPENMP(C)], [_AC_LANG_OPENMP(C++)]) + +# _AC_LANG_OPENMP(Fortran 77) +# --------------------------- +m4_define([_AC_LANG_OPENMP(Fortran 77)], +[AC_LANG_FUNC_LINK_TRY([omp_get_num_threads])]) + +# _AC_LANG_OPENMP(Fortran) +# --------------------------- +m4_copy([_AC_LANG_OPENMP(Fortran 77)], [_AC_LANG_OPENMP(Fortran)]) + +# AC_OPENMP +# --------- +# Check which options need to be passed to the C compiler to support OpenMP. +# Set the OPENMP_CFLAGS / OPENMP_CXXFLAGS / OPENMP_FFLAGS variable to these +# options. +# The options are necessary at compile time (so the #pragmas are understood) +# and at link time (so the appropriate library is linked with). +# This macro takes care to not produce redundant options if $CC $CFLAGS already +# supports OpenMP. It also is careful to not pass options to compilers that +# misinterpret them; for example, most compilers accept "-openmp" and create +# an output file called 'penmp' rather than activating OpenMP support. +AC_DEFUN([AC_OPENMP], +[ + OPENMP_[]_AC_LANG_PREFIX[]FLAGS= + AC_ARG_ENABLE([openmp], + [AS_HELP_STRING([--disable-openmp], [do not use OpenMP])]) + if test "$enable_openmp" != no; then + AC_CACHE_CHECK([for $CC option to support OpenMP], + [ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp], + [AC_LINK_IFELSE([_AC_LANG_OPENMP], + [ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp='none needed'], + [ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp='unsupported' + dnl Try these flags: + dnl GCC >= 4.2 -fopenmp + dnl SunPRO C -xopenmp + dnl Intel C -openmp + dnl SGI C, PGI C -mp + dnl Tru64 Compaq C -omp + dnl IBM C (AIX, Linux) -qsmp=omp + dnl If in this loop a compiler is passed an option that it doesn't + dnl understand or that it misinterprets, the AC_LINK_IFELSE test + dnl will fail (since we know that it failed without the option), + dnl therefore the loop will continue searching for an option, and + dnl no output file called 'penmp' or 'mp' is created. + for ac_option in -fopenmp -xopenmp -openmp -mp -omp -qsmp=omp; do + ac_save_[]_AC_LANG_PREFIX[]FLAGS=$[]_AC_LANG_PREFIX[]FLAGS + _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $ac_option" + AC_LINK_IFELSE([_AC_LANG_OPENMP], + [ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp=$ac_option]) + _AC_LANG_PREFIX[]FLAGS=$ac_save_[]_AC_LANG_PREFIX[]FLAGS + if test "$ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp" != unsupported; then + break + fi + done])]) + case $ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp in #( + "none needed" | unsupported) + ;; #( + *) + OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp ;; + esac + fi + AC_SUBST([OPENMP_]_AC_LANG_PREFIX[FLAGS]) +])