> Plainly _AA_ and _$(abspath AA)_ are the same file, but make doesn't think so.
> Make seems just to use string matching (other relative paths to the same file
> are seen as different files (_subdir/../A.. for instance)).
That is correct: make targets are strings. Distinct strings are treated
as distinct targets, even if they name the same file.
> This is playing havoc with auto-generated dependencies, some of which are
> built by make rules.
How are you generating your dependencies ?
It may be necessary to post-process the generated dependency files with
a hairy invocation of sed to canonicalise the paths.
It remains that it is up to the author of the makefiles to canonicalise
names - or, rather, chose a canonical way to refer to each file. It is
not make's job to do that. Thus has it always been.
Eddy.
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