On Mon, 2011-04-04 at 12:08 +0430, ali hagigat wrote:
> Please consider the following makefile and it result in 3.81:
> -----------------------------------------
> e12: e13
> @echo 12complete
> %13: e14
> @echo 13complete_1
> %13: e14
> @echo 13complete_2
> %14:
> @echo 14complete
> e15:
> @echo 15complete
>
> 14complete
> 13complete_2
> 12complete
> -----------------------------------------
> Dear Paul, as you wrote in 3.81 the first pattern rule is executed
> according to the manual. But why the second recipe is executed in the
> above example?
>From the manual:
You can override a built-in implicit rule (or one you have
defined yourself) by defining a new pattern rule with the same
target and prerequisites, but different commands. When the new
rule is defined, the built-in one is replaced. The new rule's
position in the sequence of implicit rules is determined by
where you write the new rule.
> My second question is that why the recipe of pattern rules is taken
> differently with regular rules in 3.81? Please consider the following:
> -----------------------------------------
> e12: e13
> @echo 12complete
> e13: e14
> @echo 13complete_1
> e13: e15
> @echo 13complete_2
> e14:
> @echo 14complete
> e15:
> @echo 15complete
>
> 15complete
> 14complete
> 13complete_2
> 12complete
> -----------------------------------------
Did you look at the errors printed by GNU make when you try this
makefile? That gives you the explanation.
> For regular targets, it continues to the last target. But for pattern
> targets it deals with the first target in 3.81!!
I don't know what this means. As you show clearly in the first example,
it uses the second definition for pattern rules, not the first.
--
-------------------------------------------------------------------------------
Paul D. Smith <[email protected]> Find some GNU make tips at:
http://www.gnu.org http://make.mad-scientist.net
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist
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