What is dump_file in gcc ?

[Peryt, Sebastian]

> Subject: What is dump_file in gcc ?
> 
> I have ever seen "fprintf(dump_file,"something writes into dump_file") many
> times.
> I want to know what dump_file is and how can I check its content ?

I'm not 100% sure, but my best guess is that this is related to GCC dumps, e.g. related to passes.
You can do -fdump-<type>-<pass> where type can be e.g. rtl and pass the pass for which 
you want to gather information. I suppose there is more to those dumps, but this should get you started.

Sebastian
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