[Bug 17971] New: GCC optimisations cause workaround for Slingplayer bug 13371 to fail

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=17971

           Summary: GCC optimisations cause workaround for Slingplayer bug
                    13371 to fail
           Product: Wine
           Version: 1.1.17
          Platform: PC
               URL: http://download.slingmedia.com/player/pc/SlingPlayer-
                    Setup-EU-1.5.1.343.exe
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ole32
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: kennybobs at o2.co.uk


The workaround for Bug 13371 is to use native qcap.dll and quartz.dll.
Up to Wine 1.1.16, the workarounds work fine.  With 1.1.17 (and 1.1.18) the
workarounds fail (resulting in the same DLL Function Crash error).

While attempting a git bisect I found that the workaround still worked when
using "gcc -O0" to compile, but "gcc -O1" causes the workaround to fail.

Result of bisect with gcc -O1:

7b6dd2c9f8339a0bc14aa7f466f5c5a0bb03da06 is first bad commit
commit 7b6dd2c9f8339a0bc14aa7f466f5c5a0bb03da06
Author: Alexandre Julliard <julliard at winehq.org>
Date:   Wed Mar 11 17:28:21 2009 +0100

    ole32: Get rid of WINE_StringFromCLSID and A->W conversions.

:040000 040000 ccd95ffc3e797d4978e121994715610434851ca5
dac4595337bddbc841d737265254e1bc52ccea03 M      dlls

Reverting to previous commit allows the workaround to work with optimisations
on.

This is kind of a blocker to Bug 13371 as the pre-compiled .debs from the
WineHQ repository uses -O2 optimisation.

To complete the bisect, I had to move from GCC 4.3.2-1ubuntu12 to GCC 4.3.3 I
compiled myself, as the results were random (GCC bug).

Tested in latest gitwine wine-1.1.18-199-ga9c0c24 and an unhandled exception
occurs with -O1, workaround works with -O0.


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