On Tue, Apr 29, 2025 at 04:41:03PM -0600, Uday Shankar wrote: > Compiler warnings can catch bugs at compile time; thus, heeding them is > usually a good idea. Turn warnings into errors by default for the kublk > build so that anyone making changes is forced to heed them. Compiler > warnings can also sometimes produce annoying false positives, so provide > a flag WERROR that the developer can use as follows to have the build > and selftests run go through even if there are warnings: > > make WERROR=0 TARGETS=ublk kselftest I thought WERROR is 0 default, but actually the default value is 1. Just tried gcc 14/15 and clang 18/20, looks everything works fine. For kernel selftests, I guess the usual way is to do it explicitly by passing 'make -C tools/testing/selftests TARGETS=ublk'. Even though the build fails for people who is running the test on purpose, or doling whole kernel selfests, they still can: - report the failure - skip ublk test by adding 'SKIP_TARGETS=ublk' to command line Also this ways has been used by perf, lib/api, lib/subcmd and lib/sysmbol in linux kernel tools/, so I feel the change should be doable, but let Jens decide if it is fine to pass -Werror at default: Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx> Otherwise, it still can be enabled conditionally with default off. Thanks, Ming
