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Backticks in makefiles

General and Gameplay Programming Programming

Started by spraff November 23, 2008 04:51 PM

1 comment, last by ToohrVyk 15 years, 5 months ago

spraff

100

Author

November 23, 2008 04:51 PM

Hi there. This makefile


FOO = a b
BAR = `for i in $(FOO); do echo $$i.x; done`
demo:
        echo $(BAR)

outputs this:


echo `for i in a b; do echo $i.x; done`
a.x b.x

I was expecting it to output


echo a.x b.x
a.x b.x

I need the backticks to be evaluated BEFORE the variable BAR is assigned, not after. How do I do this? The reason is that I'm going to use BAR thusly:


demo: $(BAR)
        ...

So if there's a better way to get the transformed FOO into the dependency list of "demo:" then that'll do. Thanks

Zahlman

1,682

November 24, 2008 10:08 AM

Do you really need something this complicated?

Have you considered moving the shell commands to a batch file and just calling the batch file from the makefile?

Have you considered using a script to generate the makefile (if the goal here is to avoid repeating 'for' commands of a common form)?

ToohrVyk

1,596

November 24, 2008 10:18 AM

Depending on your make variety, BAR=$(FOO,>.x) or BAR=$(FOO:%=%.x) (or something else).

Macro modifiers, Text functions.

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Backticks in makefiles

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