diff options
Diffstat (limited to 'm4/ax_cflags_strict_prototypes.m4')
| -rw-r--r-- | m4/ax_cflags_strict_prototypes.m4 | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/m4/ax_cflags_strict_prototypes.m4 b/m4/ax_cflags_strict_prototypes.m4 new file mode 100644 index 0000000..2ac34be --- /dev/null +++ b/m4/ax_cflags_strict_prototypes.m4 @@ -0,0 +1,118 @@ +# =============================================================================== +# http://www.gnu.org/software/autoconf-archive/ax_cflags_strict_prototypes.html +# =============================================================================== +# +# SYNOPSIS +# +# AX_CFLAGS_STRICT_PROTOTYPES [(shellvar [,default, [A/NA]] +# +# DESCRIPTION +# +# Try to find a compiler option that requires strict prototypes. +# +# The sanity check is done by looking at sys/signal.h which has a set of +# macro-definitions SIG_DFL and SIG_IGN that are cast to the local +# signal-handler type. If that signal-handler type is not fully qualified +# then the system headers are not seen as strictly prototype clean. +# +# For the GNU CC compiler it will be -fstrict-prototypes +# -Wstrict-prototypes The result is added to the shellvar being CFLAGS by +# default. +# +# DEFAULTS: +# +# - $1 shell-variable-to-add-to : CFLAGS +# - $2 add-value-if-not-found : nothing +# - $3 action-if-found : add value to shellvariable +# - $4 action-if-not-found : nothing +# +# NOTE: These macros depend on AX_APPEND_FLAG. +# +# LICENSE +# +# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> +# +# 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. + +#serial 12 + +AC_DEFUN([AX_FLAGS_STRICT_PROTOTYPES],[dnl +AS_VAR_PUSHDEF([FLAGS],[_AC_LANG_PREFIX[]FLAGS])dnl +AS_VAR_PUSHDEF([VAR],[ac_cv_[]_AC_LANG_ABBREV[]flags_strict_prototypes])dnl +AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for strict prototypes], +VAR,[VAR="no, unknown" +ac_save_[]FLAGS="$[]FLAGS" +for ac_arg dnl +in "-pedantic -Werror % -fstrict-prototypes -Wstrict-prototypes" dnl GCC + "-pedantic -Werror % -Wstrict-prototypes" dnl try to warn atleast + "-pedantic -Werror % -Wmissing-prototypes" dnl try to warn atleast + "-pedantic -Werror % -Werror-implicit-function-declaration" dnl + "-pedantic -Werror % -Wimplicit-function-declaration" dnl + "-pedantic % -Wstrict-prototypes %% no, unsupported" dnl oops + # +do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` + AC_TRY_COMPILE([],[return 0;], + [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break]) +done +case ".$VAR" in + .|.no|.no,*) ;; + *) # sanity check with signal() from sys/signal.h + cp config.log config.tmp + AC_TRY_COMPILE([#include <signal.h>],[ + if (signal (SIGINT, SIG_IGN) == SIG_DFL) return 1; + if (signal (SIGINT, SIG_IGN) != SIG_DFL) return 2;], + dnl the original did use test -n `$CC testprogram.c` + [if test `diff config.log config.tmp | grep -i warning | wc -l` != 0 +then if test `diff config.log config.tmp | grep -i warning | wc -l` != 1 +then VAR="no, suppressed, signal.h," ; fi ; fi], + [VAR="no, suppressed, signal.h"]) + rm config.tmp + ;; +esac +FLAGS="$ac_save_[]FLAGS" +]) +AS_VAR_POPDEF([FLAGS])dnl +AC_REQUIRE([AX_APPEND_FLAG]) +case ".$VAR" in + .ok|.ok,*) m4_ifvaln($3,$3) ;; + .|.no|.no,*) m4_default($4,[m4_ifval($2,[AX_APPEND_FLAG([$2], [$1])])]) ;; + *) m4_default($3,[AX_APPEND_FLAG([$VAR], [$1])]) ;; +esac +AS_VAR_POPDEF([VAR])dnl +])dnl AX_FLAGS_STRICT_PROTOTYPES + +AC_DEFUN([AX_CFLAGS_STRICT_PROTOTYPES],[dnl +AC_LANG_PUSH([C]) +AX_FLAGS_STRICT_PROTOTYPES([$1], [$2], [$3], [$4]) +AC_LANG_POP([C]) +]) + +AC_DEFUN([AX_CXXFLAGS_STRICT_PROTOTYPES],[dnl +AC_LANG_PUSH([C++]) +AX_FLAGS_STRICT_PROTOTYPES([$1], [$2], [$3], [$4]) +AC_LANG_POP([C++]) +]) |