[PATCH v1] perf build: Pretend scandirat is missing with msan

From: Ian Rogers
Date: Wed Mar 20 2024 - 12:33:05 EST


Memory sanitizer lacks an interceptor for scandirat, reporting all
memory it allocates as uninitialized. Memory sanitizer has a scandir
interceptor so use the fallback function in this case. This allows
perf test to run under memory sanitizer.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
tools/perf/Makefile.config | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 1fe8df97fe88..74e0b17050b5 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -486,7 +486,10 @@ ifdef NO_DWARF
endif

ifeq ($(feature-scandirat), 1)
- CFLAGS += -DHAVE_SCANDIRAT_SUPPORT
+ # Ignore having scandirat with memory sanitizer that lacks an interceptor.
+ ifeq ($(filter s% -fsanitize=memory%,$(EXTRA_CFLAGS),),)
+ CFLAGS += -DHAVE_SCANDIRAT_SUPPORT
+ endif
endif

ifeq ($(feature-sched_getcpu), 1)
--
2.44.0.291.gc1ea87d7ee-goog