[bug #47880] Allow updates to .INCLUDE_DIRS to change search path

[Steven Simpson]

Follow-up Comment #10, bug #47880 (project make):

> One trouble of this default is, when your dep files are missing, make does a
fs access per default directory for each missing dep file.

Are these always cases where you know you want a local file?  Can you use
this?:


include $(CURDIR)/foo.mk


(Or does the full path cause more accesses?)

In terms of new features, this might be better considered a question of
disabling the search path on a per-include basis, when you know you want a
local file.  The '*include' directives are implemented with a call to
eval_makefile, which has an RM_INCLUDED option to enable the search path, it
seems.  Perhaps a leading '.' on the filename should suppress it (just as '/'
does), or a new directive '*includelocal' would call without RM_INCLUDED.

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