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DropList bug when compiling with SPEED option [message #26786]

Thu, 27 May 2010 22:47

Didier
Messages: 725
Registered: November 2008
Location: France

Contributor

Hi everyone,

I just encountered this strange bug:
When compiling an app with 'GCC Speed' the DropList widget doesn't work wright: he doesn't display his value although the pull down list does Confused

This bug disappears when compiling with 'GCC Optimal'

I first though it was my code who was wrong but it isn't.
The same happens with Uword example app.

I'm compiling with : gcc (GCC) 4.4.3 20100127 (Red Hat 4.4.3-4)
and use an unmodified UPP

[Updated on: Thu, 27 May 2010 22:47]

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Re: DropList bug when compiling with SPEED option [message #26801 is a reply to message #26786]

Fri, 28 May 2010 15:52

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

Didier wrote on Thu, 27 May 2010 16:47

This bug disappears when compiling with 'GCC Optimal'

I first though it was my code who was wrong but it isn't.
The same happens with Uword example app.

I'm compiling with : gcc (GCC) 4.4.3 20100127 (Red Hat 4.4.3-4)
and use an unmodified UPP[/quote]

Strange, but not impossible.

Anyway, I have just Speed GCC with GCC 4.4.1 UWord and have not noticed anything unusual...

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Re: DropList bug when compiling with SPEED option [message #26805 is a reply to message #26801]

Fri, 28 May 2010 23:38

Didier
Messages: 725
Registered: November 2008
Location: France

Contributor

Hi Myrek,

Thanks for the reply. I remember having encountering the same kind of bug about a year ago, but it disappeared without notice.

The strange part about it ,is that for some values, the DropList's value gets displayed and for others it doesn't ???

I tried moving around UPP versions to see if it was an UPP bug, but there's no change.

Anyway this is not blocking, the speed option was a manipulation error: this ??bug?? doesn't bother me.

I'll try to keep an eye on it any way.

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Re: DropList bug when compiling with SPEED option [message #26812 is a reply to message #26805]

Sun, 30 May 2010 21:34

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

Didier wrote on Fri, 28 May 2010 17:38

Still, it could mean that some code in DropList.cpp (or elsewhere) has implementation defined baheviour, something similar to this famous example:

x[i++] = i;

which hits us when optimizer tries another path for speed optimizations....

Mirek

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