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generated...
2007-08-05

(C) 2007 guidod
Download the M4 Source.

ac_prog_cc_strict_prototypes

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Synopsis
AC_PROG_CC_STRICT_PROTOTYPES(substvar [,hard])
, 
Version

2005-01-25

Author

Guido U. Draheim <guidod@gmx.de>

License

GPLWithACException
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. 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

Category

guidod's Obsoleted (obsoleted)

Documentation

  • obsoleted Use 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.

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 &gt; conftest.c &lt;&lt;EOF
#include &lt;sys/signal.h&gt;
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&gt;&amp;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
])