Messages in this thread | | | Date | Thu, 17 Jan 2002 22:11:10 +0000 | From | Christopher Turcksin <> | Subject | Re: [PATCH] Re: 2.5.3-pre1 compile error |
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Linus Torvalds wrote:
> > Well, I actually disagree on this. For large include files (fs.h is the > > worst), and complicated arrangement, this technique eliminates spurious > > includes and saves a lot on compile time (really!). > > Numbers please.
The GNU C preprocessor remembers if an include file was completely inside an #ifndef/#endif conditional (modulo whitespace and comments) and will skip the #include for the same file if the macro in #ifndef is already defined. I suspect putting guards around the include will not save any more time.
bfn, Christopher Turcksin <turcksin@uk.ibm.com>
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