[PATCH v2] [RFC] selftests: alsa - add PCM test

[Mark Brown]

On Tue, Nov 08, 2022 at 12:59:14PM +0100, Jaroslav Kysela wrote:

> --- a/tools/testing/selftests/alsa/Makefile
> +++ b/tools/testing/selftests/alsa/Makefile
> @@ -7,6 +7,8 @@ ifeq ($(LDLIBS),)
>  LDLIBS += -lasound
>  endif
>  
> -TEST_GEN_PROGS := mixer-test
> +TEST_GEN_PROGS := mixer-test pcm-test
> +
> +pcm-test: pcm-test.c conf.c
>  
>  include ../lib.mk

This breaks out of tree kselftest builds - if you specify an output
directory with O= (as all the main automated test systems do) then any
target specific rules need to prepend $(OUTPUT)/ to specify the right
location for the output (this also works fine with in tree builds, a
default OUTPUT is generated).  Unfortunately looking at this just now
simply fixing that is causing only pcm-test to be built and not the
existing mixer-test, and explicitly specifying commands for mixer-test
causes that to be built and not pcm-test even explicitly asking to build
"all" as the target for reasons I'm not yet clear on.

You can see an example failure in:

   https://storage.kernelci.org/next/master/next-20221128/arm64/defconfig/gcc-10/logs/kselftest.log

The whole kselftest build setup is rather fragile and frustrating to
work with unfortunately, especially with tests built from multiple
objects.  The only fix I've come up with thus far is to inline conf.c
into pcm-test.c (a #include will do the trick) which isn't great.
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