[CMake] How to set environment variable for custom command

[Nicolas Desprès]

Thank you all for your suggestion. I will go with the script shell wrapper
trick even if I am not a big fan of it. I don't like the burden of
generating a wrapper just to set environment variable. Luckily CMake will
provides such a feature in the future.

Cheers,
Nico

On Fri, Jul 19, 2013 at 5:39 PM, Dan Kegel <dank at kegel.com> wrote:

> On Fri, Jul 19, 2013 at 8:21 AM, Andreas Pakulat <apaku at gmx.de> wrote:
> >> In Unix shell we can do that:
> >> $ VAR=foo cmd in out
> >> I would like to be able to do the same for a custom command in CMake.
>
> See http://public.kitware.com/Bug/view.php?id=5145
> for previous discussion.
>
> >> add_custom_command(
> >>   OUTPUT out
> >>   COMMAND cmd in out
> >>   DEPENDS in
> >>   ENVIRONMENT VAR foo
> >>   )
> >
> > I can see two options to achieve this: ...
> > b) let cmake generate a shell script (using configure_file) and set the
> > envvar in there, it would also contain the command executable and pass on
> > any arguments using $@. Then use the script as custom command instead of
> the
> > real command.
>
> c) On Mac and Linux, you can do it inline something like this:
>
>  add_custom_command(
>    OUTPUT out
>    COMMAND "FOO=${bar}" my_cmd.sh"
>    DEPENDS in
>    )
>
> On Windows, you might be able to do it inline like this:
>
>  add_custom_command(
>    OUTPUT out
>    COMMAND "set FOO=${bar}" & my_cmd.bat"
>    DEPENDS in
>    )
>
> (although I haven't tried it, so in both cases you might need to
> coax cmake into using a shell by prefixing the command with sh -c
> or cmd /c or something.)
>



-- 
Nicolas Desprès
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