?RCS: $Id$
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
?RCS:
?RCS: You may redistribute only under the terms of the Artistic License,
?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 License; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?RCS: Copyright (c) 2000, Jarkko Hietaniemi
?RCS:
?MAKE:gccversion gccosandvers: cat cpp rm +cc \
	Myread Guess Options Oldconfig Loc osname osvers grep ccname
?MAKE:	-pick add $@ %<
?S:gccversion:
?S:	If GNU cc (gcc) is used, this variable holds '1' or '3' (for instance)
?S:	to indicate whether the compiler is version 1 or 3.  This is used in
?S:	setting some of the default cflags.  It is set to '' if not gcc.
?S:	Note that it only contains the major version number, and, when using
?S:	case statements to do different things depending on the major, do not
?S:	use statements like "1*)" because it will match version 1, 10, 11, etc.
?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:	or if nothing useful can be parsed as the os version.
?S:.
?T:gccshortvers incdir d
?F:!try.c !try
?LINT:extern locincpth ccflags ldflags
?LINT:change locincpth ccname cpp
: Check whether they have gcc in any guise.  
echo " "
echo "Checking for GNU cc in disguise and/or its version number..." >&4
$cat >try.c <<EOM
int main(void) {
#ifdef __GNUC__
gcc_version_major __GNUC__
#ifdef __GNUC_MINOR__
gcc_version_minor __GNUC__
#endif
#ifdef __GNUC_PATCHLEVEL__
gcc_version_patchlevel __GNUC_PATCHLEVEL__
#endif
#endif
}
EOM
if $cc -E try.c > try 2>&1
then
	gccversion=`$grep gcc_version_major try |
		sed 's/^.*gcc_version_major[\t ]*//'`
	case "$gccversion" in
	'') echo "You are not using GNU cc." ;;
	*)  echo "You are using GNU cc $gccversion."
	    ccname=gcc	
	    ;;
	esac
else
	gccversion=''
fi
$rm -f try try.*
case "$gccversion" in
1) cpp=`./loc gcc-cpp $cpp $pth` ;;
esac
case "$gccversion" in
'') gccosandvers='' ;;
*) gccshortvers=`echo "$gccversion"|sed 's/ .*//'`
   gccosandvers=`$cc -v 2>&1 | \
	$grep '/specs$'|sed "s!.*/[^-/]*-[^-/]*-\([^-/]*\)/$gccshortvers/specs!\1!"`
   gccshortvers=''
   case "$gccosandvers" in
   $osname) gccosandvers='' ;; # linux gccs seem to have no linux osvers, grr
   $osname$osvers) ;; # looking good
   $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 (headerfile conflicts being the most common
    manifestation), I suggest reinstalling the gcc to match
    your operating system release.

EOM
      ;;
   *) gccosandvers='' ;; # failed to parse, better be silent
   esac
   ;;
esac
case "$ccname" in
'') ccname="$cc" ;;
esac

: gcc 3.1 complains about adding -Idirectories that it already knows about,
: so we will take those off from locincpth.
case "$gccversion" in
3)
    echo "main(){}">try.c
    for incdir in `$cc -v -c try.c 2>&1 | \
       sed '1,/^#include <\.\.\.>/d;/^End of search list/,$d;s/^ //'` ; do
       locincpth=`echo $locincpth | sed s!$incdir!!`
    done
    $rm -f try try.*
esac