On Fri, Jul 4, 2014 at 3:36 PM, Philip Guenther <[email protected]> wrote:
> This combination of behaviors is caused by the requirement that variables
> set on the make command-line are exported to the environment for commands
> by default.
>
> For a normal recursively expanded variable, the value placed in the
> environment has to be expanded completely before being placed in the
> environment. That expansion happens at the last moment, after the
> commands are expanded but before the shell is invoked. That explains the
> original example.
>
> This can be confirmed by tell make that the RECIPE variable doesn't need
> to be exported. If you add this line to the Makefile:
> unexport RECIPE
>
> then the second '2' output goes away.
And all of a sudden it makes sense (as does the 'make' tag that
warning displayed that I couldn't make sense of).
-Etan
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