Warn if the version of the operating system used to compile gcc

[metaconfig.git] / U / perl / gccvers.U

?RCS: $Id$
?RCS:
?RCS: Copyright (c) 2000, Jarkko Hietaniemi
?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:
?MAKE:gccversion gccosandvers: cat cpp rm +cc \
	Mcc Myread Guess Options Oldconfig Loc osname osvers
?MAKE:	-pick add $@ %<
?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:.
?S:gccosandvers:
?S:	If GNU cc (gcc) is used, this variable the operating system and
?S:	version used to compile the gcc.  It is set to '' if not gcc.
?S:.
?F:!gccvers
?D:gccversion=''
?LINT:change cpp
?LINT:extern ldflags
?X: Check if they have gcc in any guise.  
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 $ldflags -o gccvers gccvers.c; then
	gccversion=`./gccvers`
	case "$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 $pth` ;;
esac
case "$gccversion" in
'') gccosandvers='' ;;
*) gccosandvers=`gcc -v 2>&1|grep '/specs$'|sed 's!.*/[^-]*-[^-]*-\([^/]*\)/'$gccversion'/specs$!\1!'`
   case "$gccosandvers" in
   $osname$osvers) ;;
   $osname*) cat <<EOM >&4

*** WHOA THERE!!! ***

    Your gcc has not been compiled for the exact release of
    your operating system ($gccosandvers versus $osname$osvers).

    In general it is a good idea to keep gcc synchronized with
    the operating system because otherwise serious problems
    may ensue when trying to compile software, like Perl.

    I'm trying to be optimistic here, though, and will continue.
    If later during the configuration and build icky compilation
    problems appear, I suggest reinstalling the gcc to match
    your operating system release.

EOM
      ;;
   *) ;; # failed to parse, better be silent
   esac
   ;;
esac