[Bug bootstrap/56927] New: 4.7.2 build ICEs when built with 4.8.0 and --disable-bootstrap

[Bug bootstrap/56927] New: 4.7.2 build ICEs when built with 4.8.0 and --disable-bootstrap

[segher at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56927

             Bug #: 56927
           Summary: 4.7.2 build ICEs when built with 4.8.0 and
                    --disable-bootstrap
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: segher@gcc.gnu.org
              Host: x86_64-linux
            Target: x86_64-linux
             Build: x86_64-linux


When using a 4.8.0 host compiler and configuring with --disable-bootstrap,
a build of 4.7.2 fails with

/home/segher/src/gcc-4.7.2/libgcc/libgcc2.c: In function '__absvdi2':
/home/segher/src/gcc-4.7.2/libgcc/libgcc2.c:273:1: internal compiler error:
Segmentation fault

There is no such error if the host compiler is 4.4 or 4.7, or without
--disable-bootstrap; it does have the error if doing a cross to i386-elf.
I haven't tested with tip-of-tree of either 4.7 or 4.8 or on different
architectures.

[Bug bootstrap/56927] 4.7.2 build ICEs when built with 4.8.0 and --disable-bootstrap

[segher at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56927

--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> 2013-04-11 19:25:05 UTC ---
Forgot to mention...  I debugged this a little; it happens during
the build of the 32-bit libgcc, and gdb says

Program received signal SIGSEGV, Segmentation fault.
build_conflict_bit_table ()
    at /home/segher/src/gcc-4.7.2/gcc/ira-conflicts.c:178
178                   ira_allocno_t live_a = OBJECT_ALLOCNO (live_obj);
(gdb) bt
#0  build_conflict_bit_table ()
    at /home/segher/src/gcc-4.7.2/gcc/ira-conflicts.c:178
#1  ira_build_conflicts ()
    at /home/segher/src/gcc-4.7.2/gcc/ira-conflicts.c:856
#2  0x000000000067eccf in ira_build ()
    at /home/segher/src/gcc-4.7.2/gcc/ira-build.c:3101
#3  0x0000000000679177 in ira (f=<optimized out>)
    at /home/segher/src/gcc-4.7.2/gcc/ira.c:3626
#4  rest_of_handle_ira () at /home/segher/src/gcc-4.7.2/gcc/ira.c:3798
[...]

(gdb) p live_obj
$1 = (ira_object_t) 0x0

[Bug bootstrap/56927] 4.7.2 build ICEs when built with 4.8.0 and --disable-bootstrap

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56927

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jakub at gcc dot gnu.org
         Resolution|                            |FIXED

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-11 20:02:43 UTC ---
You should use 4.7.3 instead, or at least make sure to have
http://gcc.gnu.org/r191605 applied.

[Bug bootstrap/56927] 4.7.2 build ICEs when built with 4.8.0 and --disable-bootstrap

[segher at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56927

--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> 2013-04-12 00:15:26 UTC ---
Hey, 4.7.3 didn't exist yet :-)

Confirmed fixed.

[Bug bootstrap/56927] 4.7.2 build ICEs when built with 4.8.0 and --disable-bootstrap

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56927

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.7.3

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2013-04-12 00:31:08 UTC ---
(In reply to comment #3)
> Hey, 4.7.3 didn't exist yet :-)

It was released today.