[PATCH v1 08/12] perf build: Record the display-only features in FEATURE-DUMP

[Arnaldo Carvalho de Melo <acme@kernel.org>]

From: Arnaldo Carvalho de Melo <acme@redhat.com>

llvm-perf and rust are in FEATURE_DISPLAY but not in FEATURE_TESTS: they
can't be part of the test-all fast path, which sets every FEATURE_TESTS
entry to 1 when test-all.c builds.  Since FEATURE-DUMP is written from
FEATURE_TESTS only, a FEATURES_DUMP= build, as used by build-test, never
sees them and silently builds without libLLVM and the rust workloads.

Append the display features that aren't in FEATURE_TESTS to the dump
after the regular feature checks have run.

Fixes: 206dcfca1f5cfac3 ("perf build: Autodetect minimum required llvm-dev version")
Fixes: 3f5dfa472ea6771c ("tools build: Fix rust feature detection")
Cc: James Clark <james.clark@linaro.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/Makefile.config | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index b4764f69f47f4d8c..1b5caa246345c9bb 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -1310,3 +1310,7 @@ endif
 # tests.
 $(shell rm -f $(FEATURE_DUMP_FILENAME))
 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
+# Features only in FEATURE_DISPLAY aren't part of the test-all fast path, so
+# they have to be checked explicitly and recorded here too, otherwise a
+# FEATURES_DUMP= build silently disables them (llvm-perf, rust).
+$(foreach feat,$(filter-out $(FEATURE_TESTS),$(FEATURE_DISPLAY)),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
-- 
2.56.0