[Webkit-unassigned] [Bug 44052] Crash on mingw-w64 in Qt Browser demo and Assistant

Tue Sep 21 07:11:40 PDT 2010

https://bugs.webkit.org/show_bug.cgi?id=44052

--- Comment #7 from vanboxem.ruben at gmail.com  2010-09-21 07:11:40 PST ---
After many rebuilds of Qt, trying out different options, it seems a release build with -flto enabled produces a crashing browser example. This may make it a GCC optimization bug, but I will still try to get more info for this case. To this effect, I have modified mkspecs/win32-g++/qmake.conf:

QMAKE_CFLAGS_RELEASE = -g -O2
QMAKE_CFLAGS_LTCG = -flto
...
QMAKE_LFLAGS_LTCG = -flto -fwhopr=2

This, together with "configure -ltcg..." enables link time optimization for gcc like it does for MSVC. The stacktrace I get from this is extremely unhelpful:

#0  0x000000000165d02d in QWebInspector::qt_metacast(char const*) () from M:\Development\x64\Qt\bin\QtWebKit4.dll
#1  0x00000000066ddcf0 in ?? ()
#2  0x0000000003f82a18 in ?? ()
#3  0x0000000000000000 in ?? ()

To get more debug info, I am recompiling with debug flag "-ggdb3", and removing the linker command "-Wl,-s" from QMAKE_LFLAGS_RELEASE which apparently still ripped out all debug info.

I will post the more informative backtrace here when I get it. Perhaps someone with a linux install can test and see if lto is also problematic there, then it is not a mingw-dependent problem.

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