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

differs from the current version of the operating system.
Also display the gcc compilation os and version in myconfig.
Inspiration from

Subject: Re: [ID 20000710.003] ERRORS!!         
Message-ID: <20000710155416.A1384@O2.chapin.edu>

p4raw-id: //depot/perl@6460

1 files changed, 33 insertions, 1 deletions

diff --git a/Configure b/Configure
index 5be461dffb..cc4fa3e05d 100755
--- a/Configure
+++ b/Configure
@@ -20,7 +20,7 @@
 
 # $Id: Head.U,v 3.0.1.9 1997/02/28 15:02:09 ram Exp $
 #
-# Generated on Sat Jul 29 00:58:08 EET DST 2000 [metaconfig 3.0 PL70]
+# Generated on Sat Jul 29 02:22:13 EET DST 2000 [metaconfig 3.0 PL70]
 # (with additional metaconfig patches by perlbug@perl.com)
 
 cat >/tmp/c1$$ <<EOF
@@ -597,6 +597,7 @@ fflushNULL=''
 fflushall=''
 fpossize=''
 fpostype=''
+gccosandvers=''
 gccversion=''
 gidformat=''
 gidsign=''
@@ -3180,6 +3181,36 @@ $rm -f gccvers*
 case "$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
+
+
+
 
 : see how we invoke the C preprocessor
 echo " "
@@ -15610,6 +15641,7 @@ freetype='$freetype'
 full_ar='$full_ar'
 full_csh='$full_csh'
 full_sed='$full_sed'
+gccosandvers='$gccosandvers'
 gccversion='$gccversion'
 gidformat='$gidformat'
 gidsign='$gidsign'