[Bug 5218] New: Wine compiled with -Os optimization crashes

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=5218

           Summary: Wine compiled with -Os optimization crashes
           Product: Wine
           Version: CVS
          Platform: PC
               URL: http://appdb.winehq.org/appview.php?appId=1836
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-loader
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: phil at mail.ru


Wine compiled with -Os optimization flag crashes when loading some native dlls. 
Using git bisect I've tracked it down to this recent commit:

Alexandre Julliard: ntdll: Add wrappers for the string functions.
http://source.winehq.org/git/?p=wine.git;a=commitdiff;h=473fbcb781a2d42dd93d
05680dfdef88999349fa

+loaddll,+module,+imports log and backtrace attached.

You can see from the backtrace that the top of the stack is corrupted. I tried 
to single-step to the crash, and it happens on a TRACE_() in fixup_imports(). 
When I step by single instructions, I see that it enters wine_dbg_log at PLT and 
next segfaults - I think that the relocation table or whatever this @PLT thing 
uses gets overwritten with ASCII data at some previous stage.

When I comment out these TRACE_()s or compile without -Os, everything works 
fine.

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