Subject: Re: Communicating Variables to a Sub-make
To: None <netbsd-users@netbsd.org>
From: Petar Bogdanovic <list+2007@smokva.net>
List: netbsd-users
Date: 11/06/2007 21:57:03
On Sun, Nov 04, 2007 at 11:01:57PM +0100, Petar Bogdanovic wrote:
> Hi,
>
> the GNU-make syntax of exporting make-variables to a submake or a
> subshell looks like:
>
> export variable = value
>
> or
>
> variable = value
> export variable
>
>
> Is something similar possible with NetBSD make?
Somebody just pointed this out (man make):
variable=value
Set the value of the variable variable to value. Normally, all
values passed on the command line are also exported to sub-makes
in the environment. The -X flag disables this behavior. Vari-
able assignments should follow options for POSIX compatibility
but no ordering is enforced.
That doesn't seem to be valid for the environment of subshells, but
one apparently could do something like this:
$ cat makefile
show:
@./s.sh
$ cat s.sh
#!/bin/sh
echo MYVAR: ${MYVAR-unset}
$ make -f makefile
MYVAR: unset
$ make -f makefile MYVAR=test
MYVAR: test
or install -current and use `.export':
http://mail-index.netbsd.org/source-changes/2007/10/05/0034.html
Regards,
Petar