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Bug#714840: marked as done ([gcc-4.7] gcc generates wrong code for global register variables)

Your message dated Tue, 23 Jun 2015 07:24:48 +0000
with message-id <E1Z7IZc-0001tY-Ii@franck.debian.org>
and subject line Bug#789156: Removed package(s) from unstable
has caused the Debian Bug report #714840,
regarding [gcc-4.7] gcc generates wrong code for global register variables
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
714840: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=714840
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: gcc-4.7
Version: 4.7.2-5
Severity: normal

--- Please enter the report below this line. ---

When I compile and run the small program below using
    gcc -O2 -o test test.c
    ./test
I get the (correct) output
    1

When I compile and run the small program below using
    gcc -DFAIL -O2 -o test test.c
    ./test
I get the (wrong) output
    2

The define "-DFAIL" only adds an empty asm statement which shouldn't make any 
difference (see below).

***************************************************************
#include <stdio.h>

unsigned long reg;

register unsigned long *env asm ("rbp");
register unsigned long T0 asm ("rbx");
register unsigned long T1 asm ("r12");

void
cmpxchgl(void)
{
        unsigned long dst;

        dst = *env - T0;
        if ((unsigned) dst == 0) {
                T0 = (T0 & ~0xffffffff) | (T1 & 0xffffffff);
        } else {
                *env = (*env & ~0xffffffff) | (T0 & 0xffffffff);
        }
#ifdef FAIL
        asm volatile ("");
#endif
}

int
main(void)
{
        env = &reg;

        *env = 0;
        T0 = 1;
        T1 = 2;
        cmpxchgl();
        printf("%lx\n", T0);

        return 0;
}
***************************************************************

--- System information. ---
Architecture: amd64
Kernel:       Linux 3.2.0-4-amd64

Debian Release: 7.1
  500 stable-updates  ftp.de.debian.org 
  500 stable          security.debian.org 
  500 stable          ftp.de.debian.org 

--- Package information. ---
Depends               (Version) | Installed
===============================-+-===============
gcc-4.7-base        (= 4.7.2-5) | 4.7.2-5
cpp-4.7             (= 4.7.2-5) | 4.7.2-5
binutils            (>= 2.21.1) | 2.22-8
libgcc1          (>= 1:4.7.2-5) | 1:4.7.2-5
libgomp1           (>= 4.7.2-5) | 4.7.2-5
libitm1            (>= 4.7.2-5) | 4.7.2-5
libquadmath0       (>= 4.7.2-5) | 4.7.2-5
libc6                 (>= 2.11) | 2.13-38
libgmp10                        | 2:5.0.5+dfsg-2
libmpc2                         | 0.9-4
libmpfr4             (>= 3.1.0) | 3.1.0-5
zlib1g             (>= 1:1.1.4) | 1:1.2.7.dfsg-13


Recommends       (Version) | Installed
==========================-+-============
libc6-dev      (>= 2.13-5) | 2.13-38


Suggests                     (Version) | Installed
======================================-+-===============
gcc-4.7-multilib                       | 4.7.2-5
libmudflap0-4.7-dev       (>= 4.7.2-5) | 
gcc-4.7-doc                 (>= 4.7.2) | 4.7.2-2
gcc-4.7-locales             (>= 4.7.2) | 
libgcc1-dbg                            | 
libgomp1-dbg                           | 
libitm1-dbg                            | 
libquadmath0-dbg                       | 
libmudflap0-dbg                        | 
libcloog-ppl0           (>= 0.15.9-2~) | 
libppl-c2                              | 
libppl7                                | 
binutils-gold              (>= 2.21.1) |

--- End Message ---
--- Begin Message --- 
Version: 4.7.4-3+rm

Dear submitter,

as the package gcc-4.7 has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/789156

The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Luca Falavigna (the ftpmaster behind the curtain)

--- End Message ---
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