tree 49e086dfe29fc6b88e11e992364fe2508bab769f
parent ec06fa2b148836f3f50082eb502b8f0aadb8970a
author Arnd Bergmann <arnd@arndb.de> 1588868731 +0200
committer Paul E. McKenney <paulmck@kernel.org> 1589400046 -0700

ubsan, kcsan: Don't combine sanitizer with kcov on clang

Clang does not allow -fsanitize-coverage=trace-{pc,cmp} together
with -fsanitize=bounds or with ubsan:

clang: error: argument unused during compilation: '-fsanitize-coverage=trace-pc' [-Werror,-Wunused-command-line-argument]
clang: error: argument unused during compilation: '-fsanitize-coverage=trace-cmp' [-Werror,-Wunused-command-line-argument]

To avoid the warning, check whether clang can handle this correctly
or disallow ubsan and kcsan when kcov is enabled.

Link: https://bugs.llvm.org/show_bug.cgi?id=45831
Link: https://lore.kernel.org/lkml/20200505142341.1096942-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>