Re: [Buildroot] Accessing environment variables in Config.in

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

On Wed, 12 Jul 2023 23:00:52 +0000
Afshin Pir <Afshin.Pir@gallagher.com> wrote:

> I wonder if I can access environment variables (or argument passed when running make) in buildroot .in files. For example, I like to have a Config.in file like this:
> 
> ```
> config BR2_PACKAGE_MY_PACKAGE
>         bool "cxos_unit_test"
>         select BR2_PACKAGE_XYZ if $(NEED_XYZ) = "y"
>         select BR2_PACKAGE_GTEST
>         help
>           This is my package.
> ```
> where NEED_XYZ is an environment variable (or make variable). Can I have such configuration file? If no, what do you suggest to achieve similar behaviour?

Yes, you can. See the top-level Config.in:

config BR2_VERSION
        string
        option env="BR2_VERSION_FULL"

config BR2_HOSTARCH
        string
        option env="HOSTARCH"

config BR2_BASE_DIR
        string
        option env="BASE_DIR"

However, be careful with what you're doing, it could very well be that
you're mis-using environment variable, and that there is a much more
Buildroot-ish way of solving your problem.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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