linux-kernel - Re: [PATCH] kselftest/alsa: add silent flag to reduce noise

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Message-ID: <vzrosmbs5x5mmnxwubwljjqxo4m4eih35z26cudshpbr3uue7j@k3v65fkr24rz>
Date: Fri, 20 Sep 2024 03:19:08 +0530
From: Abdul Rahim <abdul.rahim@...ahoo.com>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: perex@...ex.cz, tiwai@...e.com, broonie@...nel.org, shuah@...nel.org, 
	linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kselftest/alsa: add silent flag to reduce noise

On Thu, Sep 19, 2024 at 09:40:34AM GMT, Shuah Khan wrote:
> On 9/15/24 17:41, Abdul Rahim wrote:
> > When ALSA is not installed on the users system, the error:
> > 
> > "Package alsa was not found in the pkg-config search path.
> > Perhaps you should add the directory containing `alsa.pc'
> > to the PKG_CONFIG_PATH environment variable
> > Package 'alsa', required by 'virtual:world', not found"
> > 
> 
> extra line?
> 
> > is printed 3 times, which generates unnecessary noise.
> > Hence, Remove unnecessary noise using `--silence-errors` on LDLIBS
> > assignment, so the message is printed only once.
> 
> I would say this message is alerting the user that the package is missing.
> Why would you want to delete it?
> 
> > 
> > Signed-off-by: Abdul Rahim <abdul.rahim@...ahoo.com>
> > ---
> >   tools/testing/selftests/alsa/Makefile | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/testing/selftests/alsa/Makefile b/tools/testing/selftests/alsa/Makefile
> > index 25be68025290..cd022fc869fb 100644
> > --- a/tools/testing/selftests/alsa/Makefile
> > +++ b/tools/testing/selftests/alsa/Makefile
> > @@ -2,7 +2,7 @@
> >   #
> >   CFLAGS += $(shell pkg-config --cflags alsa) $(KHDR_INCLUDES)
> > -LDLIBS += $(shell pkg-config --libs alsa)
> > +LDLIBS += $(shell pkg-config --silence-errors --libs alsa)
> >   ifeq ($(LDLIBS),)
> >   LDLIBS += -lasound
> >   endif
> 
> 
> thanks,
> -- Shuah
> 

This can also be handled like this:
---
CHECK := $(shell pkg-config --exists alsa; echo $?)
ifneq ($(CHECK),0)
$(error Package alsa not found! Add directory containing alsa.pc in PKG_CONFIG_PATH)
endif
---

Benefits:
	- save computation, by not attempting compilation that is sure to fail
	- reduce clutter in output;

Regards,
Abdul