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AC_PROG_CC_STRICT_PROTOTYPES(substvar [,hard])
1.2 (2003/02/02) 0.5.57 : guidod
Guido Draheim <guidod@gmx.de>
obsoleted by AX_CFLAGS_STRICT_PROTOTYPES
Try to find a compiler option that warns when a function prototype is not fully defined. Enable it only if the the system headers are reasonably clean with respect to compiling with 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.
Currently this macro knows about GCC. hopefully will evolve to use: Solaris C compiler, Digital Unix C compiler, C for AIX Compiler, HP-UX C compiler, and IRIX C compiler.
AC_DEFUN([AC_PROG_CC_STRICT_PROTOTYPES], [
pushdef([CV], ac_cv_prog_cc_strict_prototypes)dnl
hard=$2
if test -z "$hard"; then
msg="C to warn at nonstrict prototypes"
else
msg="C to require strict prototypes"
fi
AC_CACHE_CHECK($msg, CV, [
cat > conftest.c <<EOF
#include <sys/signal.h>
int main (void)
{
if (signal (SIGINT, SIG_IGN) == SIG_DFL) return 0;
return 1;
}
EOF
dnl GCC
if test "$GCC" = "yes"; then
if test -z "$hard"; then
CV="-Wstrict-prototypes"
else
CV="-fstrict-prototypes -Wstrict-prototypes"
fi
if test -n "`${CC-cc} -c $CV conftest.c 2>&1`" ; then
CV="suppressed...sys/stat.h"
fi
dnl Solaris C compiler
dnl HP-UX C compiler
dnl Digital Unix C compiler
dnl C for AIX Compiler
dnl IRIX C compiler
fi
rm -f conftest.*
])
if test -z "[$]$1" ; then
if test -n "$CV" ; then
case "$CV" in
*...*) $1="" ;; # known but suppressed
*) $1="$CV" ;;
esac
fi
fi
AC_SUBST($1)
popdef([CV])dnl
])