## ----------------------------------------- #### ANSIfy the C compiler whenever possible.  #### From Franc,ois Pinard                     #### ----------------------------------------- ### Copyright 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc.# 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, 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, write to the Free Software# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA# 02111-1307, USA.# serial 1# @defmac AC_PROG_CC_STDC# @maindex PROG_CC_STDC# @ovindex CC# If the C compiler in not in ANSI C mode by default, try to add an option# to output variable @code{CC} to make it so.  This macro tries various# options that select ANSI C on some system or another.  It considers the# compiler to be in ANSI C mode if it handles function prototypes correctly.## If you use this macro, you should check after calling it whether the C# compiler has been set to accept ANSI C; if not, the shell variable# @code{am_cv_prog_cc_stdc} is set to @samp{no}.  If you wrote your source# code in ANSI C, you can make an un-ANSIfied copy of it by using the# program @code{ansi2knr}, which comes with Ghostscript.# @end defmacAC_DEFUN([AM_PROG_CC_STDC],[AC_REQUIRE([AC_PROG_CC])AC_BEFORE([$0], [AC_C_INLINE])AC_BEFORE([$0], [AC_C_CONST])dnl Force this before AC_PROG_CPP.  Some cpp's, eg on HPUX, requirednl a magic option to avoid problems with ANSI preprocessor commandsdnl like #elif.dnl FIXME: can't do this because then AC_AIX won't work due to adnl circular dependency.dnl AC_BEFORE([$0], [AC_PROG_CPP])AC_MSG_CHECKING([for ${CC-cc} option to accept ANSI C])AC_CACHE_VAL(am_cv_prog_cc_stdc,[am_cv_prog_cc_stdc=noac_save_CC="$CC"# Don't try gcc -ansi; that turns off useful extensions and# breaks some systems' header files.# AIX			-qlanglvl=ansi# Ultrix and OSF/1	-std1# HP-UX 10.20 and later	-Ae# HP-UX older versions	-Aa -D_HPUX_SOURCE# SVR4			-Xc -D__EXTENSIONS__for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"do  CC="$ac_save_CC $ac_arg"  AC_TRY_COMPILE([#include <stdarg.h>#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>/* Most of the following tests are stolen from RCS 5.7's src/conf.sh.  */struct buf { int x; };FILE * (*rcsopen) (struct buf *, struct stat *, int);static char *e (p, i)     char **p;     int i;{  return p[i];}static char *f (char * (*g) (char **, int), char **p, ...){  char *s;  va_list v;  va_start (v,p);  s = g (p, va_arg (v,int));  va_end (v);  return s;}int test (int i, double x);struct s1 {int (*f) (int a);};struct s2 {int (*f) (double a);};int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);int argc;char **argv;], [return f (e, argv, 0) != argv[0]  ||  f (e, argv, 1) != argv[1];],[am_cv_prog_cc_stdc="$ac_arg"; break])doneCC="$ac_save_CC"])if test -z "$am_cv_prog_cc_stdc"; then  AC_MSG_RESULT([none needed])else  AC_MSG_RESULT([$am_cv_prog_cc_stdc])ficase "x$am_cv_prog_cc_stdc" in  x|xno) ;;  *) CC="$CC $am_cv_prog_cc_stdc" ;;esac])