Re: implicit rule and VPATH

[Paul D. Smith]

%% "Hakenson, Gary C." <address@hidden> writes:

  hgc> I have an issue with make that I am unable to resolve on my own.

  hgc> My makefile contains an implicit rule as follows:

  hgc>  %.d : %.c
  hgc>          (command to create a .d file from the .c file here)

  hgc> I also have the VPATH variable set as follows:

  hgc>  VPATH = /d

  hgc> When I run make, it finds both the target (.d) and the
  hgc> prerequisite (.c) in the /d directory and since the target is
  hgc> newer then the prerequisite nothing is done. This is as expected
  hgc> since the current directory does not contain a .d file.

  hgc> There exists in the current directory a .c file. What I want to
  hgc> happen is for the above implicit rule to be invoked on this .c
  hgc> file to produce a .d file (in the current directory) but this is
  hgc> not happening.

Can you provide a small, but _complete_ makefile that shows this
behavior?  These kinds of things often depend on exactly how the real
target (foo.d / foo.c) is accessed in the rest of the makefile, not just
how the pattern rule is created.

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