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# Local additions to Autoconf macros.
# Copyright (C) 1992, 1994 Free Software Foundation, Inc.
# Francois Pinard <pinard@iro.umontreal.ca>, 1992.
# @defmac fp_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 defines @code{__STDC__} to 1 and
# 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{fp_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
define(fp_PROG_CC_STDC,
[AC_CACHE_CHECK(for ${CC-cc} option to accept ANSI C,
fp_cv_prog_cc_stdc,
[fp_cv_prog_cc_stdc=no
ac_save_CFLAGS="$CFLAGS"
# 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 -Ae or -Aa -D_HPUX_SOURCE
# SVR4 -Xc
# For HP-UX, we try -Ae first; this turns on ANSI but also extensions,
# as well as defining _HPUX_SOURCE, and we can then use long long.
# We keep the old version for backward compatibility.
for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-Aa -D_HPUX_SOURCE" -Xc
do
CFLAGS="$ac_save_CFLAGS $ac_arg"
AC_TRY_COMPILE(
[#ifndef __STDC__
choke me
#endif
], [int test (int i, double x);
struct s1 {int (*f) (int a);};
struct s2 {int (*f) (double a);};],
[fp_cv_prog_cc_stdc="$ac_arg"; break])
done
CFLAGS="$ac_save_CFLAGS"
])
case "x$fp_cv_prog_cc_stdc" in
x|xno) ;;
*) CC="$CC $fp_cv_prog_cc_stdc" ;;
esac
])
builtin(include, aczsh.m4)
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