der Mouse wrote:

>>I'd be much more interested in a tool which can figure out if we use
>>nothing out of an include file. ;-)
> 
> 
> Yes, me too.  I've occasionally considered trying to make gcc do that,
> but so far I anticipate it being intimidating enough that I haven't
> actually tried.

Consider pre-compiling all system headers.  Do them all all at once at
the start of the build.  Heck, once header precompilation is main stream,
the the default mode version probably ought to get distributed to boot!
Cheers - Bruce