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Re: Using ccache to improve compilation speed

On Tue, 7 May 2002, Jakub Jelinek wrote:

> On Tue, May 07, 2002 at 07:47:23AM -0400, Daniel Berlin wrote:
> > Right.
> > The reason ccache improves compilation speed is because of false 
> > dependencies in makefiles and whatnot.
> Not always.
> For developing an application out of CVS it is usually really a matter of broken
> makefile dependencies if files are recompiled needlessly, but
> e.g. when building from src.rpm (resp. .deb and whatever other package
> format), the sequence is unpack the source somewhere, apply patches,
> build, install, package.
> If you are building foo-1.1 package and later on foo-1.2
> then lots of compilation usually can be saved and it is
> definitely not because of broken makefile dependencies.

Sure. I was including that in the "whatnot", but i probably should have 
been more clear that one of the other major case is when you happen to 
have compiled it some other time, and it hasn't changed.

But I still don't think it's something for gcc to be doing on it's own.
> 	Jakub

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