Steps to reproduce the issue

spack install findutils %gcc @11.2.0

This version of GCC was installed via Spack.

findutils uses the macro __nonnull internally to expand to __attribute__((__nonnull__(...))), which declarers that certain pointer arguments to functions cannot be null. This fails on my system where this attribute is not supported.

findutils checks whether this attribute is supported on the build system, but this check is not working correctly. This bug was reported upstream in January 2021 as https://savannah.gnu.org/bugs/?func=detailitem&item_id=59972.

Information on your system

$ spack debug report

• Spack: 0.17.1-778-2ab871dd17
• Python: 3.8.5
• Platform: darwin-bigsur-skylake
• Concretizer: clingo

Additional information

spack-build-out.txt
spack-build-env.txt
config.log

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have run spack maintainers <name-of-the-package> and @mentioned any maintainers
• I have uploaded the build log and environment files
• I have searched the issues of this repo and believe this is not a duplicate