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perf jevents: Suppress circular dependency warnings

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When doing an in source build, $(OUTPUT) is empty so the rule has the
same input and output file. Suppress the warning by only adding the rule
when doing an out of source build. The same condition already exists for
the clean rule for json files.

This fixes the following warnings:

  make[3]: Circular pmu-events/arch/nds32/mapfile.csv <- pmu-events/arch/nds32/mapfile.csv dependency dropped.
  make[3]: Circular pmu-events/arch/powerpc/mapfile.csv <- pmu-events/arch/powerpc/mapfile.csv dependency dropped.
  ...

Signed-off-by: James Clark <james.clark@linaro.org>
Tested-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
James Clark
2025-10-20 17:08:28 +01:00
committed by Namhyung Kim
parent 2ef335ead2
commit 29166bd0a4
1 changed files with 3 additions and 1 deletions
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4
tools/perf/pmu-events/Build
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@@ -29,10 +29,12 @@ $(PMU_EVENTS_C): $(EMPTY_PMU_EVENTS_C)
$(call rule_mkdir)
$(Q)$(call echo-cmd,gen)cp $< $@
else
# Copy checked-in json for generation.
# Copy checked-in json to OUTPUT for generation if it's an out of source build
ifneq ($(OUTPUT),)
$(OUTPUT)pmu-events/arch/%: pmu-events/arch/%
$(call rule_mkdir)
$(Q)$(call echo-cmd,gen)cp $< $@
endif
$(LEGACY_CACHE_JSON): $(LEGACY_CACHE_PY)
$(call rule_mkdir)