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?