[CMake] How to set environment variable for custom command

[Nicolas Desprès]

Hi,

In Unix shell we can do that:
$ VAR=foo cmd in out

This way the environment variable is only set in the environment of the
process of the command and not the in current shell like when using the
"export" built-in.

I would like to be able to do the same for a custom command in CMake.
Ideally I was looking for something like that:

add_custom_command(
  OUTPUT out
  COMMAND cmd in out
  DEPENDS in
  ENVIRONMENT VAR foo
  )

Any idea?

Cheers,

-- 
Nicolas Desprès
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