gcc - how to use pre-compiled header filess?

[Neil Bird <neil@xxxxxxxxxx>]

  The online docs. for gcc have had talk of pre-compiled header files 
for while, but there's no mention of it in the Shrike gcc 3.2.2 - nor 
can I find it in the release notes of 3.2.3 or 3.3, so I can't state 
that it's been introduced since 3.2.2.

  Does anyone know when this came in, or whether it's something that 
isn't compiled into the RH gcc (don't think so, as the info page for it 
is even 'missing' from gcc I have installed).

  Or is there some way of triggering it that I'm missing?  I'm fairly 
certain, though, that it's not there due to the missing info page.

--
[neil@xxx ~]# rm -f .signature
[neil@xxx ~]# ls -l .signature
ls: .signature: No such file or directory
[neil@xxx ~]# exit