gdb: use AC_PROG_CC_STDC instead of AM_PROG_CC_STDC

`autoconf -Wall` notes that AM_PROG_CC_STDC is obsolete:
Fixes this autoconf warning:

    configure.ac:40: warning: 'AM_PROG_CC_STDC': this macro is obsolete.
    configure.ac:40: You should simply use the 'AC_PROG_CC' macro instead.
    configure.ac:40: Also, your code should no longer depend upon 'am_cv_prog_cc_stdc',
    configure.ac:40: but upon 'ac_cv_prog_cc_stdc'.
    aclocal.m4:770: AM_PROG_CC_STDC is expanded from...
    configure.ac:40: the top level

Since we build with a C++ compiler now, I don't think this is relevant.
If you look at the messages removed from gdbsupport/aclocal.m4, it says
that this functionality is now integrated in AC_PROG_CC, which we
already call.  So it might not even make a difference.

We had a local version of AM_PROG_CC_STDC, in gdb/acinclude.m4 (only
used by gdb/configure.ac), remove it.

gdb/ChangeLog:

	* acinclude.m4 (AM_PROG_CC_STDC): Remove.
	* configure: Re-generate.
	* configure.ac: Remove AM_PROG_CC_STDC.

gdbsupport/ChangeLog:

	* aclocal.m4: Re-generate.
	* configure: Re-generate.
	* configure.ac: Remove AM_PROG_CC_STDC.

Change-Id: Ic824393598805d4f78cda9d119f8af46096e9c73

1 files changed, 0 insertions, 108 deletions

diff --git a/gdb/acinclude.m4 b/gdb/acinclude.m4
index 9aa32e6..a557d6b 100644
--- a/gdb/acinclude.m4
+++ b/gdb/acinclude.m4
@@ -78,114 +78,6 @@ m4_include(ax_cxx_compile_stdcxx.m4)
 
 m4_include([../config/ax_pthread.m4])
 
-## ----------------------------------------- ##
-## ANSIfy the C compiler whenever possible.  ##
-## From Franc,ois Pinard                     ##
-## ----------------------------------------- ##
-
-# Copyright (C) 1996-2020 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, see <http://www.gnu.org/licenses/>.
-
-# 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 defmac
-
-AC_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, require
-dnl a magic option to avoid problems with ANSI preprocessor commands
-dnl like #elif.
-dnl FIXME: can't do this because then AC_AIX won't work due to a
-dnl circular dependency.
-dnl AC_BEFORE([$0], [AC_PROG_CPP])
-AC_MSG_CHECKING([for ${CC-cc} option to accept ANSI C])
-AC_CACHE_VAL(am_cv_prog_cc_stdc,
-[am_cv_prog_cc_stdc=no
-ac_save_CC="$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])
-done
-CC="$ac_save_CC"
-])
-if test -z "$am_cv_prog_cc_stdc"; then
-  AC_MSG_RESULT([none needed])
-else
-  AC_MSG_RESULT([$am_cv_prog_cc_stdc])
-fi
-case "x$am_cv_prog_cc_stdc" in
-  x|xno) ;;
-  *) CC="$CC $am_cv_prog_cc_stdc" ;;
-esac
-])
-
 dnl written by Guido Draheim <guidod@gmx.de>, original by Alexandre Oliva 
 dnl Version 1.3 (2001/03/02)
 dnl source http://www.gnu.org/software/ac-archive/Miscellaneous/ac_define_dir.html