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# ================================================================================
# https://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>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 18
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 at least
"-pedantic -Werror % -Wmissing-prototypes" dnl try to warn at least
"-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_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[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_COMPILE_IFELSE([AC_LANG_PROGRAM([[#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
AX_REQUIRE_DEFINED([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++])
])
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