selftests: harness: Mark test fixture objects __maybe_unused

Mark _##fixture_name##_##test_name##_object __maybe_unused since it may
not ever be read. This pointer is only read in XFAIL_ADD(), which tests
are not required to use.

clang made a change to -Wunused-but-set-variable (split out into its own
subwarning, -Wunused-but-set-global) that causes this warning to be
emitted for various selftests and can be upgraded to an error in
selftest that set -Werror.

VFIO selftests have been broken since commit ff556bd98348 ("vfio:
selftests: Add -Wall and -Werror to the Makefile"), and the net
selftests builds have been noisy due to -Wall.

Fixes: 24cf65a62266 ("selftests/harness: Share _metadata between forked processes")
Reported-by: Kuniyuki Iwashima <kuniyu@google.com>
Reported-by: Aaron Lewis <aaronlewis@google.com>
Reviewed-by: Alex Williamson <alex@shazbot.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20260706183154.2660394-1-dmatlack@google.com
Signed-off-by: Alex Williamson <alex@shazbot.org>

0 files changed, 0 insertions, 0 deletions