Re: .SECONDEXPANSION and patsubst

[Oleksandr Gavenko]

On 15.09.2010 17:10, Martin d'Anjou wrote:
> Hi,
>
> I do not understand this .SECONDEXPANSION problem with patsubst. It
> seems patsubst has no effect. Here is the code:
> .SECONDEXPANSION:
> test_foo_core := core_bar
> core_%:
> @echo CORE $@
> test_%: core_$$(patsubst core_%,%,$$(test_$$*_core))
> @echo TEST $@
>
> And how it executes:
> $ make test_foo
> CORE core_core_bar <<<<<< actual result core_core_bar
> TEST test_foo
>
> Expected result:
> CORE core_bar <<<<<<< expected result, core_bar
> TEST test_foo
>
> I expect $(patsubst) to chop off the leading "core_" and to see
> "core_bar", and not "core_core_bar".
>
> I am sure it is something very simple, but after many hours of working
> on this, another pair of eyes would be much appreciated!
This worked as not desired:

variable := prefix_value
.SECONDEXPANSION:
test_%: $$(info $$(patsubst prefix_%,%_suffix,$$(variable)))
        @echo TEST $@

  $ make test_foo
prefix_value
TEST test_foo

When change example to

PERCENT = %
variable := prefix_value
.SECONDEXPANSION:
test_%: $$(info $$(patsubst 
prefix_$$(PERCENT),$$(PERCENT)_suffix,$$(variable)))
        @echo TEST $@

work successful:

  $ make test_foo
value_suffix
TEST test_foo

So  '%' in patsubst conflict with '%' mining in static rules!

--
Happy hacking!
С уважением, Александр Гавенко.