Hi Jeff,
Am Fri, 14 Jan 2011 11:38:29 -0600
schrieb JeffS <[email protected]>:
>
> Hi! I'm using GNU Make 3.80. In my Makefile, I use automatic
> variable $@ to refer to the current target, as shown below.
>
> | @echo current target is ... [$@]
> ifeq ($@,sms)
> @echo yep, they are equal
> else
> @echo no, they are not equal
> endif
> |
>
> It seems that $@ expands to sms , as shown in the output below.
>
> Output is:
>
> |current target is ... [sms]
> no, they are not equal
> |
>
> My question: since $@ (apparently) expands to sms
at rule execution time
> , shouldn't the "true" branch of the ifeq conditional be executed
> (with the consequence that the output should read yep, they are
> equal)?
No, as that get evaluated at rule parsing long before rule execution.
>[I am at a loss as to why the output is no, they are not equal.]
>
> Thank you for any advice you can provide.
try this:
COMMA := ,
sms:
@echo $(if $(filter sms,$@),\
yep$(COMMA) they are equal,\
no$(COMMA) they are not equal)
notsms:
@echo $(if $(filter sms,$@),\
yep$(COMMA) they are equal,\
no$(COMMA) they are not equal)
BR,
Bjoern
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