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| author | Eric Biggers <ebiggers@kernel.org> | 2025-06-25 13:23:08 -0700 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2025-06-26 10:51:40 -0700 |
| commit | 55a18d2f3ff79c9082225f44e0abbaea6286bf99 (patch) | |
| tree | c58eec952c37037e17ccdff54361a864358247f8 /tools/perf | |
| parent | perf top: populate PMU capabilities data in perf_env (diff) | |
| download | linux-55a18d2f3ff79c9082225f44e0abbaea6286bf99.tar.gz linux-55a18d2f3ff79c9082225f44e0abbaea6286bf99.zip | |
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: 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>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/Makefile.config | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 24736b0bbb30..70a3e771c7c0 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -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 |