[MinGW-notify] [ mingw-Bugs-3426555 ] Compiler bug in GCC 4.6.2

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Bugs item #3426555, was opened at 2011-10-20 22:06
Message generated for change (Comment added) made by zhnmju123
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Category: MinGW
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: ZenJu (zhnmju123)
Assigned to: Nobody/Anonymous (nobody)
Summary: Compiler bug in GCC 4.6.2

Initial Comment:
Hi,

this one has cost me a good part of my sanity. After hours of painful trial and error I was able to create a minmal sample:

Symptoms: The compiled application crashes due to an allegedly uncaught exception. However the exception should be catched, as can be seen in the sourcecode.

Reproduce:
1. get MinGW latest repository catalogues (GCC 4.62) via automatic installer
2. Create a new CodeBlocks console project
3. Set optimization to O3 - this is important!
4. integrate file "main.cpp" from the attachment
Alternative: load test.cbp directly from attachment. However note that this is nothing more than steps 1 -4.

5. Compile, start and let it crash.

Further remarks:
This example is *really* minimal. If I make any change, the bug is not reproducible anymore, for example:
- Set optimization to O2 instead of O3 -> no crash
- Set size of char array "errorMessage" to 2000 instead of 20000 -> no crash
- use an older compiler from automatic installer: pre-packaged repository catalogues 20110802 -> no crash
- remove any of the other seemingly unused or superfluous pieced of code -> no crash
- This is not some theoretical problem, actually my users currently suffer from application crashes that can be attributed to this bug.

My Setup: 
- Windows7 x64, 
- latest repository catalogues (GCC 4.62) complete new install as of today, for the purpose of verification
- IDE: Codeblocks nighly

Regards, ZenJu

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>Comment By: ZenJu (zhnmju123)
Date: 2011-10-21 10:28

Message:
> I assume you mean gcc 4.6.1
Yes, it's 4.6.1-2

> Or are you running mingw-w64's
No, I'm using the ordinary 32-bit MinGW compiler.

> try adding '-fno-omit-frame-pointer'
Great, this works!!! Now I'm crossing fingers, this really worked around
the problem and it doesn't pop up elsewhere...

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Comment By: Chris Sutcliffe (ir0nh34d)
Date: 2011-10-21 01:01

Message:
I assume you mean gcc 4.6.1?  Or are you running mingw-w64's gcc 4.6.2? 
Regardless, try adding '-fno-omit-frame-pointer' to your compile options. 
I ran in to a similar issue with the O2 optimization when compiling the
latest GDB.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=3426555&group_id=2435