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Diffstat (limited to 'm4/ax_c___attribute__.m4')
| -rw-r--r-- | m4/ax_c___attribute__.m4 | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/m4/ax_c___attribute__.m4 b/m4/ax_c___attribute__.m4 new file mode 100644 index 0000000..a8bcb73 --- /dev/null +++ b/m4/ax_c___attribute__.m4 @@ -0,0 +1,70 @@ +# =========================================================================== +# http://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_C___ATTRIBUTE__(ATTRIBUTE-ID) +# +# DESCRIPTION +# +# Provides a test for the compiler support of the +# __attribute__((ATTRIBUTE-ID)) extension. +# Defines HAVE_ATTRIBUTE_<ATTRIBUTE-ID> if it is found. +# +# LICENSE +# +# Copyright (c) 2008 Stepan Kasal <skasal@redhat.com> +# Copyright (c) 2008 Christian Haggstrom +# Copyright (c) 2008 Ryan McCabe <ryan@numb.org> +# Copyright (c) 2011 Andrea Canciani <ranma42@gmail.com> +# +# 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 2 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. + +#serial 10 + +AC_DEFUN([AX_C_ATTRIBUTE], [ + AC_CACHE_CHECK([for __attribute__(($1))], [ax_cv_attribute_$1], + [AX_NODIFF_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[ +static void foo (void); +static void foo (void) { return; } + ]], [[foo ()]])], + [AC_LANG_PROGRAM( + [[ +static void foo (void) __attribute__ (($1)); +static void foo (void) { return; } + ]], [[foo ()]])], + [ax_cv_attribute_$1=yes], + [ax_cv_attribute_$1=no] + ) + ]) + if test "$ax_cv_attribute_$1" = "yes"; then + AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_ATTRIBUTE_$1]), 1, [Define to 1 if your compiler has __attribute__(($1)).]) + fi +]) |