URL:
<http://savannah.gnu.org/bugs/?35455>
Summary: “Empty Recipes” documentation update
Project: make
Submitted by: sjw
Submitted on: Sun 05 Feb 2012 05:11:29 PM GMT
Severity: 3 - Normal
Item Group: Documentation
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 3.80
Operating System: POSIX-Based
Fixed Release: None
Triage Status: None
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Details:
I found it necessary to use the “empty recipe” rule in circumstances which
don’t seem to match those in the documentation (edition 0.71 as at
www.gnu.org).
I’ve attached a Makefile with comments to indicate what works for me and
what goes wrong.
In summary, I process a .uml file to extract the .norm files implied by its
contents, and then process the .norm files to create .gen files. Most of this
can be standardised, but there’s no way for standard processing to determine
beforehand which .norm files are “contained” in a .uml file.
I created a .norm-stamp file whenever I’ve processed a .uml file, and then
added a rule to say that many.uml “contains” a.norm and b.norm:
a.norm b.norm: many.norm-stamp
The first time I say “make a.gen”, all is well. If I then touch many.uml
and say “make a.gen” again, make only gets as far as creating
many.norm-stamp (and a.norm, b.norm); you have to run make again to regenerate
a.gen.
I found that I can get the behaviour I need by adding an empty recipe:
a.norm b.norm: many.norm-stamp ;
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Sun 05 Feb 2012 05:11:29 PM GMT Name: Makefile Size: 909B By: sjw
<http://savannah.gnu.org/bugs/download.php?file_id=24990>
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