[ccache] how to use ccache

Francois Marier francois at debian.org
Sat Dec 8 09:01:35 GMT 2007

On 2007-12-07 at 23:24:19, Mahmood NT wrote:
> >If your library makes it so that you can't reuse any of the already compiled
> >objects, then ccache is unlikely to make things faster for you.
> Excuse me but I did not understand. What is the mechanism of ccache?

Simply put, when you compile a .c file, it produces a .o file.  ccache keeps
track of the checksum on the .c file and then stores the corresponding .o.

The next time you compile that .c file, if it hasn't changed, it will have
the same checksum and ccache will already have the .o file for it so it
won't have to compile it again.

Now, in your case, it sounds like there will be very few .c files that do
not change, so ccache will not be able to speed up the compilation by
using already cached .o files.


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