[Bug target/47178] New: QtWebKit miscompiled for x86_64-*-mingw*

[Bug target/47178] New: QtWebKit miscompiled for x86_64-*-mingw*

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47178

           Summary: QtWebKit miscompiled for x86_64-*-mingw*
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: vanboxem.ruben@gmail.com


The 64-bit runtime provided by the mingw-w64 project together with the GCC
toolchain can compile Qt completely (with no known issues as far as I know)
with GCC 4.4 (earlier versions don't have the necessary support for x64
Windows).

Only with GCC 4.5 and 4.6, issues arise in the form of runtime errors when
QtWebKit is compiled for x86_64-w64-mingw32.

I have created a WebKit bug report here:
https://bugs.webkit.org/show_bug.cgi?id=44052

The report has a stack backtrace of a Qt application (Assistant) showing the
crash. All binaries are compiled with "-g3" (highest debug level). Optimization
level (none or -O2) does not change the fact that the app crashes.

Looking at the backtrace, the problem is in WebKit somewhere, but as no other
platforms show this problem, the issue must be toolchain-side somewhere.

A correct binary is produced using patched (for Win64) 4.4 GCC toolchains.

[Bug target/47178] QtWebKit miscompiled for x86_64-*-mingw*

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47178

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2011.01.11 12:15:04
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-01-11 12:15:04 UTC ---
We need a testcase.

[Bug target/47178] QtWebKit miscompiled for x86_64-*-mingw*

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47178

--- Comment #2 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-01-11 12:35:37 UTC ---
I'm sorry,

I cannot make a testcase for this because I don't know the exact cause of the
problem. Webkit is huge, and highly optimised and above my understanding... 

I have provided all the information that I can, and tested several different
(Webkit) build configurations.

Sorry.

[Bug target/47178] QtWebKit miscompiled for x86_64-*-mingw*

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47178

Kai Tietz <ktietz at gcc dot gnu.org> changed:

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

--- Comment #3 from Kai Tietz <ktietz at gcc dot gnu.org> 2011-04-12 19:50:38 UTC ---
Well, as we don't get a testcase for this. I'll close the bug as WONTFIX