Re: Setting an environment variable while inside a target

[pip9ball]

Hi Paul,

Thank you very much for your quick reply!  I will try out both of these
methods first thing tomorrow at work.

-Phil


Paul Smith-20 wrote:
> 
> 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 <address@hidden>          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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> 

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