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Subject[PATCH 3/4] ubsan: Force -Wno-maybe-uninitialized only for GCC
Date
Clang handles 'maybe-uninitialized' better in the face of using UBSAN,
so do not make this universally disabled for UBSAN builds.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
lib/Kconfig.ubsan | 6 ++++++
scripts/Makefile.ubsan | 6 +++---
2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index aeb2cdea0b94..1fc07f936e06 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -36,6 +36,12 @@ config UBSAN_KCOV_BROKEN
See https://bugs.llvm.org/show_bug.cgi?id=45831 for the status
in newer releases.

+config UBSAN_DISABLE_MAYBE_UNINITIALIZED
+ def_bool CC_IS_GCC
+ help
+ -fsanitize=* options makes GCC less smart than usual and
+ increases the number of 'maybe-uninitialized' false-positives.
+
config CC_HAS_UBSAN_BOUNDS
def_bool $(cc-option,-fsanitize=bounds)

diff --git a/scripts/Makefile.ubsan b/scripts/Makefile.ubsan
index 72862da47baf..c5ef6bac09d4 100644
--- a/scripts/Makefile.ubsan
+++ b/scripts/Makefile.ubsan
@@ -1,8 +1,8 @@
# SPDX-License-Identifier: GPL-2.0

-# -fsanitize=* options makes GCC less smart than usual and
-# increases the number of 'maybe-uninitialized' false-positives.
-ubsan-cflags-$(CONFIG_UBSAN) += $(call cc-disable-warning, maybe-uninitialized)
+# The "maybe-uninitialized" warning can be very noisy.
+ubsan-cflags-$(CONFIG_UBSAN_DISABLE_MAYBE_UNINITIALIZED) += \
+ $(call cc-disable-warning, maybe-uninitialized)

# Enable available and selected UBSAN features.
ubsan-cflags-$(CONFIG_UBSAN_ALIGNMENT) += -fsanitize=alignment
--
2.25.1
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