linux-kernel - Re: next-20250909: selftests/arm64/gcs/basic-gcs.c:390:30: error: use of undeclared identifier 'HWCAP

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Message-ID: <a275fc97-24d8-477d-b7aa-79c2d61d93ad@sirena.org.uk>
Date: Thu, 11 Sep 2025 22:01:43 +0100
From: Mark Brown <broonie@...nel.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: open list <linux-kernel@...r.kernel.org>,
	Linux ARM <linux-arm-kernel@...ts.infradead.org>,
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>,
	lkft-triage@...ts.linaro.org,
	Linux Regressions <regressions@...ts.linux.dev>,
	Catalin Marinas <catalin.marinas@....com>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Anders Roxell <anders.roxell@...aro.org>,
	Ben Copeland <benjamin.copeland@...aro.org>,
	Shuah Khan <shuah@...nel.org>
Subject: Re: next-20250909: selftests/arm64/gcs/basic-gcs.c:390:30: error:
 use of undeclared identifier 'HWCAP_GCS'

On Fri, Sep 12, 2025 at 12:48:47AM +0530, Naresh Kamboju wrote:
> The following build warnings / errors noticed on arm64 defconfig
> with clang-20 and gcc-13 toolchains on the Linux next-20250909
> till next-20250911 tag while building selftests/arm64.
> 
> Regression Analysis:
> - New regression? Yes
> - Reproducibility? yes
> 
> First seen on  next-20250909
>  Good: next-20250908
>  Bad: next-20250909 till next-20250911
> 
> Test regression: next-20250909:
> selftests/arm64/gcs/basic-gcs.c:390:30: error: use of undeclared
> identifier 'HWCAP_GCS'

This will be due to Thomas Weißschuh's nolibc changes which went in
during that time period and did change the program to use nolibc's
getauxval, presumably that's broken with this clang version or
something?

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