Re: Invalid VPATH directories query

[Paul D. Smith]

%% "J. Grant" <address@hidden> writes:

  jg> I have noticed some accidental mistakes with invalid VPATH
  jg> directories.  I wonder if there is any way Make could first check
  jg> the directories are valid and list the ones which are invalid?

Just because they're invalid when make starts doesn't mean they will be
when make searches for them.

Also, VPATH is often used intentionally in situations where one or more
of the directories on VPATH does not exist; that's one of its use cases
("pick the first one where the source exists").

  jg> Would such a feature be supported if not already present? (I could
  jg> not find it)

You can, of course, do it yourself; something like:

  _nonexistent_vpath := $(filter $(VPATH),$(wildcard $(VPATH)))

  ifdef _nonexistent_vpath
    $(error These VPATH directories do not exist: $(_nonexistent_vpath))
  endif


Note, not tested but you get the idea anyway... if you use ":" separated
VPATH or want to allow for that you should do $(subst :, ,$(VPATH))
inside the wildcard function.

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