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#define bug in gcc for delta builds?
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#define bug in gcc for delta builds?


  • Subject: #define bug in gcc for delta builds?
  • From: Stephen Northcott <email@hidden>
  • Date: Wed, 4 Feb 2009 15:42:01 +0700

I have been using #define _FOO_ to conditionally alter the compilation of parts of a class.

In the .h file I had something like this..

#ifdef _FOO_

int A = 2;

#else

int A = 2;
int B = -1;

#endif // _FOO_

In the related .cpp file I would use the same value _FOO_ to control how code behaved with regards accessing A, or A and B.

If we assume that _FOO_ is not defined then...

When stepping through in XCode I noticed that when the class instance is created it will be created according to _FOO_ being defined, when it is actually not defined as I stated just above.

However, stepping into a member function the code would act correctly addressing data as if _FOO_ was not defined.

Obviously this causes a lot of problems. Data is offset, and it makes no sense to me, and threads / the main program crash!

A clean all will resolve this and things will behave again.

This is happening several times a day with incremental builds, and had been intermittently troubling me for some time now, without me actually knowing what was going on.

It certainly seems like a bug to me. But I am also concerned that perhaps some corruption has crept into my project..

Any advice / comments greatly appreciated.

Kind regards,
Stephen.



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