Follow-up Comment #1, bug #48483 (project make):
Please correct me if I'm wrong, but it sounds to me that "ccache" is exactly
what you need - you can already get what you want without any changes to
"make":
With ccache, you can always do "make clean; make" because although the
compiler will be called on all files of the project, the files that haven't
changed (and the compilation options haven't changed) will NOT be compiled
again - rather the exact same compilation results and/or compiler warning
messages will be recalled from the cache.
On many Linux distributions, merely installing the "ccache" package enables it
(it makes the compiler a symbolic link to the ccache exectable), and you can
enjoy speedy "make clean; make" afterwards.
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