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Bug 528639

Summary: internal compiler error: in loc_cmp, at var-tracking.c:2433
Product: [Fedora] Fedora Reporter: Kedar Sovani <kedars>
Component: gccAssignee: Jakub Jelinek <jakub>
Status: CLOSED UPSTREAM QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: high    
Version: rawhideCC: jakub
Target Milestone: ---Keywords: Reopened
Target Release: ---   
Hardware: arm9   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2009-11-09 17:37:37 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 245418    
Attachments:
Description Flags
auto-generated pre-compiled sources none

Description Kedar Sovani 2009-10-13 07:33:32 UTC 
Host/Build/Target Triple: armv5tel-redhat-linux-gnueabi

with gcc version: gcc-4.4.1-21

Complete build logs:
http://arm.koji.fedoraproject.org/koji/getfile?taskID=73218&name=build.log

Initially I thought this to be the same as
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41252. But the gcc sources already
had the patch indicated in that bug
(http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=151437)
Comment 1 Kedar Sovani 2009-10-13 07:34:22 UTC 
Created attachment 364554 [details]
auto-generated pre-compiled sources

auto-generated pre-compiled sources
Comment 2 Jakub Jelinek 2009-10-19 10:44:55 UTC 
Can't reproduce this with redhat/gcc-4_4-branch and a cross compiler.  So, please try gcc-4.4.2-4.fc12.
Comment 3 Kedar Sovani 2009-10-21 10:11:12 UTC 
Re-opening this bug. It is still seen with gcc-4.4.2-5.fc12

Failure build log:
http://arm.koji.fedoraproject.org/koji/getfile?taskID=73937&name=build.log&offset=-2000

Would it be rather better to reopen this bug:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41679

Although the bug is in the Fedora branch, some gcc-arm folks might at least *suggest* some fixes/tweaks etc. over there
Comment 4 Jakub Jelinek 2009-11-09 16:35:27 UTC 
Sorry, still can't reproduce, so there is hardly anything I can do about it.

You could try to build just first stage of gcc on arm (configure with --disable-bootstrap in addition to the options gcc.spec passes to configure), see if even the first stage reproduces it.  If not, this might be miscompilation of gcc itself.
Comment 5 Jakub Jelinek 2009-11-09 16:47:25 UTC 
Actually, after hand editting auto-host.h quite a bit to more match the native one and what I guess arm gas provides I've managed to reproduce it.  Looking into it.
Comment 6 Jakub Jelinek 2009-11-09 17:11:29 UTC 
Smaller testcase:

/* { dg-do compile } */
/* { dg-options "-march=armv5te -g -O2" } */

extern int a;
extern char b;
extern int foo (void);

void
test (void)
{
  int c;
  b = foo () ? '~' : '\0';
  while ((c = foo ()))
    if (c == '7')
      a = 0;
}