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perf build: enable -fno-strict-aliasing

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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: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250625202311.23244-2-ebiggers@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Eric Biggers 2025-06-25 13:23:08 -07:00 • committed by Namhyung Kim
parent c72bf82f96
commit 55a18d2f3f
1 changed files with 4 additions and 0 deletions
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4
tools/perf/Makefile.config
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@ -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