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Re: trouble with order rules in implicit rules
From: |
Paul D. Smith |
Subject: |
Re: trouble with order rules in implicit rules |
Date: |
Fri, 16 Apr 2004 13:41:41 -0400 |
%% Noel Yap <address@hidden> writes:
ny> I had thought that the better-matching rule would be the one used.
I don't know what "better-matching" means, but the way make chooses a
pattern rule is well-defined; from section "Introduction to Pattern
Rules":
> The order in which pattern rules appear in the makefile is important
> since this is the order in which they are considered. Of equally
> applicable rules, only the first one found is used.
I guess that's a little confusing, since "equally applicable" isn't
defined anywhere. But, it refers to the last sentence:
> Note however, that a rule whose prerequisites actually exist or are
> mentioned always takes priority over a rule with prerequisites that must
> be made by chaining other implicit rules.
Anyway, the short answer is that for basic pattern rules (not chained
pattern rules) the first one appearing in the makefile is always used.
--
-------------------------------------------------------------------------------
Paul D. Smith <address@hidden> Find some GNU make tips at:
http://www.gnu.org http://make.paulandlesley.org
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist