?RCS: $Id: cc.U,v 3.0.1.4 1995/05/12 12:06:47 ram Exp $
?RCS:
?RCS: Copyright (c) 1991-1993, Raphael Manfredi
?RCS: 
?RCS: You may redistribute only under the terms of the Artistic Licence,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 3.0.
?RCS:
?RCS: $Log: cc.U,v $
?RCS: Revision 3.0.1.4  1995/05/12  12:06:47  ram
?RCS: patch54: may now abort Configure when cc does not work
?RCS:
?RCS: Revision 3.0.1.3  1995/01/11  15:20:11  ram
?RCS: patch45: changed gcc checking message to a more explicit one (WED)
?RCS:
?RCS: Revision 3.0.1.2  1994/10/29  16:04:29  ram
?RCS: patch36: detect gcc even when not called as 'gcc' (ADO)
?RCS: patch36: simplified gcc version checking (ADO)
?RCS: patch36: added ?F: line for metalint file checking
?RCS:
?RCS: Revision 3.0.1.1  1994/05/06  14:26:06  ram
?RCS: patch23: added support for gcc version (ADO)
?RCS:
?RCS: Revision 3.0  1993/08/18  12:05:30  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:cc gccversion: cat contains sysman +large cpp rm \
	Mcc Myread Guess Options Oldconfig Loc
?MAKE:	-pick add $@ %<
?S:cc:
?S:	This variable holds the name of a command to execute a C compiler which
?S:	can resolve multiple global references that happen to have the same
?S:	name.  Usual values are "cc", "Mcc", "cc -M", and "gcc".
?S:.
?S:gccversion:
?S:	If GNU cc (gcc) is used, this variable holds '1' or '2' to 
?S:	indicate whether the compiler is version 1 or 2.  This is used in
?S:	setting some of the default cflags.  It is set to '' if not gcc.
?S:.
?F:!gccvers
?D:cc='cc'
?D:gccversion=''
?LINT:change cpp
: see if we need a special compiler
echo " "
if ./usg; then
	case "$cc" in
	'') case "$Mcc" in
		/*) dflt='Mcc';;
		*) case "$large" in
			-M*) dflt='cc';;
			*)	if $contains '\-M' $sysman/cc.1 >/dev/null 2>&1 ; then
					if $contains '\-M' $sysman/cpp.1 >/dev/null 2>&1; then
						dflt='cc'
					else
						dflt='cc -M'
					fi
				else
					dflt='cc'
				fi;;
			esac;;
		esac;;
	*)  dflt="$cc";;
	esac
	$cat <<'EOM'
On some systems the default C compiler will not resolve multiple global
references that happen to have the same name.  On some such systems the "Mcc"
command may be used to force these to be resolved.  On other systems a "cc -M"
command is required.  (Note that the -M flag on other systems indicates a
memory model to use!) If you have the Gnu C compiler, you might wish to use
that instead.

EOM
	rp="What command will force resolution on this system?"
	. ./myread
	cc="$ans"
else
	case "$cc" in
	'') dflt=cc;;
	*) dflt="$cc";;
	esac
	rp="Use which C compiler?"
	. ./myread
	cc="$ans"
fi
?X: Check if they have gcc in any guise.  This is really only needed
?X: if the user has version 1.x.x and needs -fpcc-struct-return.  Alas
?X: BSD/386 ships a version of gcc 1.4.2 and calls it cc.  Hence the
?X: paranoid test -- ADO.
echo " "
echo "Checking for GNU cc in disguise and/or its version number..." >&4
$cat >gccvers.c <<EOM
#include <stdio.h>
int main() {
#ifdef __GNUC__
#ifdef __VERSION__
	printf("%s\n", __VERSION__);
#else
	printf("%s\n", "1");
#endif
#endif
	exit(0);
}
EOM
if $cc -o gccvers gccvers.c >/dev/null 2>&1; then
	gccversion=`./gccvers`
	case "$gccversion" in
	'') echo "You are not using GNU cc." ;;
	*)  echo "You are using GNU cc $gccversion." ;;
	esac
else
	echo " "
	echo "*** WHOA THERE!!! ***" >&4
	echo "    Your C compiler \"$cc\" doesn't seem to be working!" >&4
?X: using -K will prevent aborting--maybe they're cross compiling?
	case "$knowitall" in
	'')
	echo "    You'd better start hunting for one and let me know about it." >&4
		exit 1
		;;
	esac
fi
$rm -f gccvers*
case "$gccversion" in
1*) cpp=`./loc gcc-cpp $cpp $pth` ;;
esac