[Bug c++/67950] New: AIX: Illegal instruction in accept()

[Bug c++/67950] New: AIX: Illegal instruction in accept()

[streibel.2003 at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67950

            Bug ID: 67950
           Summary: AIX: Illegal instruction in accept()
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: streibel.2003 at gmx dot net
  Target Milestone: ---

Created attachment 36494
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36494&action=edit
Output of the GCC build process (make)

I compiled GCC, Version 4.9.3 on an AIX 7.1 machine.
The output of the build process (make) is in the appendix.

A C test program which calls accept() works fine when compiled with gcc.
However it crashes within the accept() function when compiled with g++.
The crash happens as soon as a client connects to the server:

[root@dev71 tmp]# uname -a
AIX dev71 1 7 00F6C0A94C00
[root@dev71 tmp]# /opt/gcc-4.9.3-hans/bin/gcc -o tcpserver tcpserver.c
[root@dev71 tmp]# /opt/gcc-4.9.3-hans/bin/g++ -o tcpserver tcpserver.c
ld: 0711-768 WARNING: Object /tmp//ccy8CL9X.o, section 1, function .accept:
        The branch at address 0x8a8 is not followed by a recognized no-op
        or TOC-reload instruction. The unrecognized instruction is 0x7C691B78.
ld: 0711-768 WARNING: Object /tmp//ccy8CL9X.o, section 1, function .accept:
        The branch at address 0x8a8 is not followed by a recognized no-op
        or TOC-reload instruction. The unrecognized instruction is 0x7C691B78.
[root@dev71 tmp]# ./tcpserver 1234
--> before accept() <--
Illegal instruction (core dumped)
[root@dev71 tmp]#

A self compiled GCC, Version 4.9.1 Shows the same behaviour.
A GCC, Version 4.8.3 which we installed via an RPM package works fine.

[Bug c++/67950] AIX: Illegal instruction in accept()

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67950

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2015-10-13
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The output of building GCC is not very helpful, please see
https://gcc.gnu.org/bugs/

[Bug c++/67950] AIX: Illegal instruction in accept()

[streibel.2003 at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67950

--- Comment #2 from Hans Streibel <streibel.2003 at gmx dot net> ---
Ok, here is the missing Information:

[root@dev71 tmp]# /opt/gcc-4.9.3-hans/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/opt/gcc-4.9.3-hans/bin/gcc
COLLECT_LTO_WRAPPER=/opt/gcc-4.9.3-hans/libexec/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/lto-wrapper
Target: powerpc-ibm-aix7.1.0.0
Configured with: ./configure --with-as=/usr/bin/as --with-ld=/usr/bin/ld
--prefix=/opt/gcc-4.9.3-hans --enable-languages=c,c++
--enable-version-specific-runtime-libs --disable-nls --enable-decimal-float=dpd
--host=powerpc-ibm-aix7.1.0.0
Thread model: aix
gcc version 4.9.3 (GCC)

Compiler warnings:
Beside the warnings that where already in the original post, there are no
warnings, even None with -W and -Wall

Preprocessed files:
- tcpserver.i (produced by gcc)
- tcpserver.ii (produced by g++)

[Bug c++/67950] AIX: Illegal instruction in accept()

[streibel.2003 at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67950

--- Comment #3 from Hans Streibel <streibel.2003 at gmx dot net> ---
Created attachment 36496
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36496&action=edit
gcc preprocessed result

[Bug c++/67950] AIX: Illegal instruction in accept()

[streibel.2003 at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67950

--- Comment #4 from Hans Streibel <streibel.2003 at gmx dot net> ---
Created attachment 36497
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36497&action=edit
g++ preprocessed result

[Bug c++/67950] AIX: Illegal instruction in accept()

[streibel.2003 at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67950

--- Comment #5 from Hans Streibel <streibel.2003 at gmx dot net> ---
Just noticed:
Adding an optimization flag -O1 or -O2 to g++ removes this bug (-O0 does not
help):

[root@dev71 tmp]# /opt/gcc-4.9.3-hans/bin/g++ -o tcpserver.4.9.3++ -O1 -Wall
tcpserver.c
[root@dev71 tmp]# ./tcpserver.4.9.3++ 1234
--> before accept() <--
--> accept() returned: 4 <--
fd after accept(): 4
abc
read 0 bytes from the socket. Socket is closed
--> before accept() <--

[Bug c++/67950] AIX: Illegal instruction in accept()

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67950

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Just marked as a dup of bug 63435 as mentioned and it looks like it is only an
issue in GCC 4.9 and before.

*** This bug has been marked as a duplicate of bug 63435 ***