Commit 55a18d2f authored by Eric Biggers's avatar Eric Biggers Committed by Namhyung Kim
Browse files

perf build: enable -fno-strict-aliasing 



perf pulls in code from kernel headers that assumes it is being built
with -fno-strict-aliasing, namely put_unaligned_*() from
<linux/unaligned.h> which write the data using packed structs that lack
the may_alias attribute.  Enable -fno-strict-aliasing to prevent
miscompilations in sha1.c which would otherwise occur due to this issue.

Signed-off-by: default avatarEric Biggers <ebiggers@kernel.org>
Reviewed-by: default avatarIan Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250625202311.23244-2-ebiggers@kernel.org


Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
parent c72bf82f

tools/perf/Makefile.config

+4 −0
Original line number Diff line number Diff line
@@ -19,6 +19,10 @@ detected_var = $(shell echo "$(1)=$($(1))" >> $(OUTPUT).config-detected) 
CFLAGS := $(EXTRA_CFLAGS) $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))

HOSTCFLAGS := $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))



# This is required because the kernel is built with this and some of the code

# borrowed from kernel headers depends on it, e.g. put_unaligned_*().

CFLAGS += -fno-strict-aliasing



# Enabled Wthread-safety analysis for clang builds.

ifeq ($(CC_NO_CLANG), 0)

  CFLAGS += -Wthread-safety