[Buildroot] [PATCH 1/2] support/script/pkg-stats: run the 3 `make` calls in parallel

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello Victor,

On Thu, 11 Jul 2019 11:54:47 +0200
Victor Huesca <victor.huesca@bootlin.com> wrote:

> +def check_multiple_output(cmds, *popenargs, **kwargs):
> +    '''
> +    Run each `cmd` asynchronousely and return their respective output.
> +    The execution time is the max of all subprocess execution time.
> +    '''
> +    processes = [subprocess.Popen(cmd, *popenargs,
> +                                  stdout=subprocess.PIPE,
> +                                  stderr=subprocess.PIPE,
> +                                  **kwargs) for cmd in cmds]
> +    for proc in processes:
> +        out, err = proc.communicate()
> +        yield out
> +
> +
>  def package_init_make_info():
> +    # Fetch all variables at once
> +    licenses, files, versions = check_multiple_output([
> +        ["make", "BR2_HAVE_DOT_CONFIG=y", "-s", "printvars", "VARS=%_LICENSE"],
> +        ["make", "BR2_HAVE_DOT_CONFIG=y", "-s", "printvars", "VARS=%_LICENSE_FILES"],
> +        ["make", "BR2_HAVE_DOT_CONFIG=y", "-s", "printvars", "VARS=%_VERSION"],

Instead of doing this, what about running:

	make printvars VARS="%_LICENSE %_LICENSE_FILES %_VERSION"

and then parse out the result, which will contain all the _LICENSE,
_LICENSE_FILES and _VERSION variables ?

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com