Download M4 Source Macro History Category Index

ac_prog_cc_strict_prototypes

Obsolete Macro

Use AX_CFLAGS_STRICT_PROTOTYPES.

Synopsis

AC_PROG_CC_STRICT_PROTOTYPES(substvar [,hard])

Description

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.

Author

Guido U. Draheim <guidod@gmx.de>

Last Modified

2008-04-12

M4 Source Code

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
])

License

Copyright © 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 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 Macro 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.