diff options
Diffstat (limited to 'm4/ax_check_compiler_flags.m4')
| -rw-r--r-- | m4/ax_check_compiler_flags.m4 | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/m4/ax_check_compiler_flags.m4 b/m4/ax_check_compiler_flags.m4 new file mode 100644 index 0000000..7da8324 --- /dev/null +++ b/m4/ax_check_compiler_flags.m4 @@ -0,0 +1,74 @@ +# =========================================================================== +# http://www.nongnu.org/autoconf-archive/ax_check_compiler_flags.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE]) +# +# DESCRIPTION +# +# Check whether the given compiler FLAGS work with the current language's +# compiler, or whether they give an error. (Warnings, however, are +# ignored.) +# +# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on +# success/failure. +# +# LICENSE +# +# Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu> +# Copyright (c) 2009 Matteo Frigo +# +# This program is free software: you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by the +# Free Software Foundation, either version 3 of the License, or (at your +# option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General +# Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program. If not, see <http://www.gnu.org/licenses/>. +# +# As a special exception, the respective Autoconf Macro's copyright owner +# gives unlimited permission to copy, distribute and modify the configure +# scripts that are the output of Autoconf when processing the Macro. You +# need not follow the terms of the GNU General Public License when using +# or distributing such scripts, even though portions of the text of the +# Macro appear in them. The GNU General Public License (GPL) does govern +# all other use of the material that constitutes the Autoconf Macro. +# +# This special exception to the GPL applies to versions of the Autoconf +# Macro released by the Autoconf Archive. When you make and distribute a +# modified version of the Autoconf Macro, you may extend this special +# exception to the GPL to apply to your modified version as well. + +AC_DEFUN([AX_CHECK_COMPILER_FLAGS], +[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX +AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1]) +dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname: +AS_LITERAL_IF([$1], + [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]), [ + ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS + _AC_LANG_PREFIX[]FLAGS="$1" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], + AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes, + AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no) + _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])], + [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS + _AC_LANG_PREFIX[]FLAGS="$1" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], + eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes, + eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no) + _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS]) +eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]) +AC_MSG_RESULT($ax_check_compiler_flags) +if test "x$ax_check_compiler_flags" = xyes; then + m4_default([$2], :) +else + m4_default([$3], :) +fi +])dnl AX_CHECK_COMPILER_FLAGS |