On Thu, 2009-02-19 at 19:42 -0800, pip9ball wrote:
> I'm looking for a way to export/set an environment variable while I'm inside
> a target.
>
> test1:
> export CURRENT_TARGET = $@
> @printenv | grep CURRENT_TARGET
>
> Is this possible?
Each line of a recipe is invoked inside a different shell. If you want
to set an environment variable inside the recipe, you have to put the
command on the same line. For example:
test1:
CURRENT_TARGET='$@' env | grep CURRENT_TARGET
Note that your syntax above is wrong in two ways: first, shell variable
assignments cannot have whitespace around the "=", and second the
"export VAR=VAL" form is not portable; since make always runs recipes
using /bin/sh you should use only portable shell constructs.
Another alternative for GNU make is to use its export keyword, like
this:
CURRENT_TARGET = $@
export CURRENT_TARGET
test1:
env | grep CURRENT_TARGET
Because you are using "=" and not ":=", the variable won't be expanded
until the recipe is about to be run, by which time "$@" will be set
properly.
--
-------------------------------------------------------------------------------
Paul D. Smith <[email protected]> Find some GNU make tips at:
http://www.gnu.org http://make.mad-scientist.us
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist
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