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Why should we not use GCC 4.0 for deployment on systems earlier than Mac OS X 10.3.9?

Hi

I have been reading the documentation of GCC to see the caveats of this compiler and I really wanted to start using GCC 4.0 because it makes smaller code at faster compiling speeds. However, the docs state that we SHOULD NOT use GCC 4.0 if we want to deploy on systems earlier than Mac OS X 10.3.9. It is not said we CANNOT, only that we SHOULDN'T. My question is: why shouldn't we? What's the penalty of that? Will an app break because of that? Or we will find inexplicable runtime errors?

Another question related to the first: is possible to compile my code with GCC 4.0 to make sure that my code is cleaner and then shift back to GCC 3.3 to assure compatibility with earlier Mac OS X versions, or am I asking for trouble?

I would like to hear your thoughts on that.

TIA

João _______________________________________________
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