[aklug] Re: bash die

On Wed, 15 Sep 2010, Christopher Howard wrote:

> I was of the understand that make doesn't preserve variable assignments
> across commands, which means you couldn't do something like this:
>
> VAR=`ls`
> echo $VAR
>
> If I'm wrong, write me a Makefile that proves it.

There's more than one way to skin that cat. Here, for instance, is a
pseudo-recursive ls written in make:

   DIR ?= '.'
   TARGETS := $(shell ls $(DIR))

   default:
     @echo
     @echo "Listing files in $(DIR):"
     @echo
     @echo $(TARGETS)
     for tgt in $(TARGETS) ; do \
       ( test -d $(DIR)/$$tgt && $(MAKE) DIR=$(DIR)/$$tgt ) \
       ; done

This relies on calling itself recursively and overwriting variable defs on
the command line.

> And how do you write functions in a Makefile?

Those are just rules, basically, but you can also use 'define' to create
macros as well.

         --Arthur Corliss
           Live Free or Die
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Received on Wed Sep 15 16:24:27 2010