?RCS: $Id$
?RCS:
?RCS: Copyright (c) 2000, Jarkko Hietaniemi
?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 3.0.
?RCS:
?MAKE:gccversion gccosandvers gccansipedantic: cat cpp rm +cc \
	Myread Guess Options Oldconfig Loc osname osvers run
?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 holds the operating system
?S:	and version used to compile gcc.  It is set to '' if not gcc,
?S:	or if nothing useful can be parsed as the os version.
?S:.
?S:gccansipedantic:
?S:	If GNU cc (gcc) is used, this variable will enable (if set) the
?S:	-ansi and -pedantic ccflags for building core files (through
?S:	cflags script). (See Porting/pumpkin.pod for full description).
?S:.
?D:gccversion=''
?D:gccansipedantic=''
?T:gccshortvers
?T:incdir
?T:warn
?F:!try
?LINT:change cpp
?LINT:extern ccflags
?LINT:extern ldflags
?LINT:extern locincpth
?LINT:extern ccname
?LINT:change ccname
?LINT:change locincpth
?LINT:change ccflags
?LINT:set gccansipedantic
?X: Check if they have gcc in any guise.
: Check if we are using GNU gcc and what its version is
echo " "
echo "Checking for GNU cc in disguise and/or its version number..." >&4
$cat >try.c <<EOM
#include <stdio.h>
int main() {
#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
#ifdef __VERSION__
	printf("%s\n", __VERSION__);
#else
	printf("%s\n", "1");
#endif
#endif
	return(0);
}
EOM
if $cc -o try $ccflags $ldflags try.c; then
	gccversion=`$run ./try`
	case "$gccversion" in
	'') echo "You are not using GNU cc." ;;
	*)  echo "You are using GNU cc $gccversion."
	    ccname=gcc
	    ;;
	esac
else
	echo " "
	echo "*** WHOA THERE!!! ***" >&4
	echo "    Your C compiler \"$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
$rm -f try try.*
case "$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.* complain about adding -Idirectories that they already know about,
# so we will take those off from locincpth.
case "$gccversion" in
3*)
    echo "main(){}">try.c
    for incdir in $locincpth; do
       warn=`$cc $ccflags -I$incdir -c try.c 2>&1 | \
	     grep '^c[cp]p*[01]: warning: changing search order '`
       if test "X$warn" != X; then
	   locincpth=`echo " $locincpth " | sed "s! $incdir ! !"`
       fi
    done
    $rm -f try try.*
esac

# gcc 4.9 by default does some optimizations that break perl.
# see ticket 121505.
#
# The -fwrapv disables those optimizations (and probably others,) so
# for gcc 4.9 (and later, since the optimizations probably won't go
# away), add -fwrapv unless the user requests -fno-wrapv, which
# disables -fwrapv, or if the user requests -fsanitize=undefined,
# which turns the overflows -fwrapv ignores into runtime errors.
case "$gccversion" in
4.[3-9].*|4.[1-9][0-9]*|[5-9].*|[1-9][0-9]*)
    case "$ccflags" in
    *-fno-wrapv*|*-fsanitize=undefined*|*-fwrapv*) ;;
    *) ccflags="$ccflags -fwrapv" ;;
    esac
esac