Re: c++/6453: g++ regression in 3.1

[Manfred Hollstein <manfredh@redhat.com>]

The following reply was made to PR c++/6453; it has been noted by GNATS.

From: Manfred Hollstein <manfredh@redhat.com>
To: green@redhat.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c++/6453: g++ regression in 3.1
Date: Thu, 25 Apr 2002 17:31:36 +0200

 green@redhat.com wrote:
 >>Number:         6453
 >>Category:       c++
 >>Synopsis:       g++ regression in 3.1
 >>Confidential:   no
 >>Severity:       non-critical
 >>Priority:       medium
 >>Responsible:    unassigned
 >>State:          open
 >>Class:          ice-on-illegal-code
 >>Submitter-Id:   net
 >>Arrival-Date:   Thu Apr 25 08:16:00 PDT 2002
 >>Closed-Date:
 >>Last-Modified:
 >>Originator:     Anthony Green
 >>Release:        3.1 20020424 (prerelease)
 >>Organization:
 >>Environment:
 > 
 > System: Linux louie 2.4.7-10smp #1 SMP Thu Sep 6 17:09:31 EDT 2001 i686 unknown
 > Architecture: i686
 > 
 > 	
 > host: i686-pc-linux-gnu
 > build: i686-pc-linux-gnu
 > target: i686-pc-linux-gnu
 > configured with: /louie/green/3.1/gcc/configure --prefix=/louie/green/3.1/i --enable-threads --enable-languages=c,c++,java : (reconfigured)  : (reconfigured) 
 
 Hmm, my snapshot from yesterday's branch in CVS (2002/04/24 10:12:11
 +0200) works without generating an ICE. I did a clean build of
 everything, though, ie. I don't have any (reconfigured) notes.
 
 My full Configure with: line reads like this:
 
 Configured with: ../gcc-3.1/configure --host=i686-redhat7-linux-gnu 
 --target=i686-redhat7-linux-gnu --build=i686-redhat7-linux-gnu 
 --srcdir=../gcc-3.1 --prefix=/opt/gnu 
 --exec-prefix=/opt/gnu/H-ia32-linux --with-gnu-as --with-gnu-ld 
 --disable-checking --enable-clocale=gnu --enable-interpreter 
 --enable-shared --enable-threads=posix --with-system-zlib 
 --with-local-prefix=/opt/gnu --enable-languages=c++,java,ada 
 --enable-nls --verbose
 
 Cheers.
 
 l8er
 manfred
 
 > 
 >>Description:
 > 
 > Given the following nonsense code...
 > 
 > void *foo()
 > {
 >   char x[100];
 >   x++;
 >   return (void *) x;
 > }
 > 
 > Red Hat's g++ 2.96 reports:
 > 
 > $ g++ -c c.cc
 > c.cc: In function `void *foo ()':
 > c.cc:4: non-lvalue in increment
 > c.cc:3: warning: address of local variable `x' returned
 > 
 > Unfortunately I don't have an older FSF release handy to test on (like
 > 2.95, or 3.0), so I don't know what they do.  However, the current 3.1
 > branch says:
 > 
 > $ g++ -c c.cc
 > non-lvalue
 > 
 > in
 > 
 > increment
 > 
 > address
 > 
 > of
 > 
 > local
 > 
 > variable
 > 
 > `
 > Internal compiler error: Error reporting routines re-entered.
 > Please submit a full bug report,
 > with preprocessed source if appropriate.
 > See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
 > 
 > 
 > 
 >>How-To-Repeat:
 > 
 > Compile the following with g++:
 > 
 > void *foo()
 > {
 >   char x[100];
 >   x++;
 >   return (void *) x;
 > }
 > 
 > 
 >>Fix:
 > 
 > 	
 > 
 >>Release-Note:
 >>Audit-Trail:
 >>Unformatted:
 > 
 >