Re: Referencing awk field in rules put out by eval function

[Paul Smith]

On Wed, 2008-02-06 at 12:47 -0800, Huan-Chih Tsai wrote:
> define TEST_RULE
> .PHONY: $(1)
> $(1):
>          awk '{if (NF > 1) {print $$1 " " $$2} }' < Makefile
> endef

Sorry, but you have to double-escape the "$" in the rule.

When you invoke "call", it will expand the value (it has to, to replace
the arguments like $(1)!) so that undoes one level of $ escaping.  Thus
when your rule is defined it will be:

        test:
                awk '{if (NF > 1) {print $1 " " $2} }' < Makefile

and when make expands it, the $1 and $2 will drop out.  You can use
"make -p" to see this.

You need:

        define TEST_RULE
        .PHONY: $(1)
        $(1):
                 awk '{if (NF > 1) {print $$$$1 " " $$$$2} }' < Makefile
        endef

-- 
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 Paul D. Smith <address@hidden>                 http://make.mad-scientist.us
 "Please remain calm--I may be mad, but I am a professional."--Mad Scientist