tools build: Add a feature test for rust compiler

Add a feature test to identify if the rust compiler is available, so
that perf could build rust based worloads based on that.

Signed-off-by: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Author: erthalion

tools/build/Makefile.feature

@@ -100,7 +100,8 @@ FEATURE_TESTS_BASIC :=                  \
         disassembler-four-args		\
         disassembler-init-styled	\
         file-handle			\
-        libopenssl
+        libopenssl			\
+        rust
 
 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
 # of all feature tests
@@ -149,7 +150,8 @@ FEATURE_DISPLAY ?=              \
          bpf			\
          libaio			\
          libzstd		\
-         libopenssl
+         libopenssl		\
+         rust
 
 #
 # Declare group members of a feature to display the logical OR of the detection

tools/build/feature/Makefile

@@ -112,6 +112,9 @@ __BUILD = $(CC) $(CFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.c,$(@F)) $(
 __BUILDXX = $(CXX) $(CXXFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$(@F)) $(LDFLAGS)
   BUILDXX = $(__BUILDXX) > $(@:.bin=.make.output) 2>&1
 
+__BUILDRS = $(RUSTC) $(RUSTC_FLAGS) -o $@ $(patsubst %.bin,%.rs,$(@F))
+  BUILDRS = $(__BUILDRS) > $(@:.bin=.make.output) 2>&1
+
 ###############################
 
 $(OUTPUT)test-all.bin:
@@ -388,6 +391,10 @@ $(OUTPUT)test-libopenssl.bin:
 $(OUTPUT)test-bpftool-skeletons.bin:
 	$(SYSTEM_BPFTOOL) version | grep '^features:.*skeletons' \
 		> $(@:.bin=.make.output) 2>&1
+
+$(OUTPUT)test-rust.bin:
+	$(BUILDRS) > $(@:.bin=.make.output) 2>&1
+
 ###############################
 
 clean:

tools/build/feature/test-rust.rs

@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+fn main() {
+    println!("hi")
+}

tools/perf/Makefile.config

@@ -1153,6 +1153,17 @@ ifneq ($(NO_LIBTRACEEVENT),1)
   endif
 endif
 
+ifndef NO_RUST
+  ifneq ($(feature-rust), 1)
+    $(warning Rust is not found. Test workloads with rust are disabled.)
+    NO_RUST := 1
+  else
+    NO_RUST := 0
+    CFLAGS += -DHAVE_RUST_SUPPORT
+    $(call detected,CONFIG_RUST_SUPPORT)
+  endif
+endif
+
 # Among the variables below, these:
 #   perfexecdir
 #   libbpf_include_dir

tools/perf/builtin-check.c

@@ -60,6 +60,7 @@ struct feature_status supported_features[] = {
 	FEATURE_STATUS("numa_num_possible_cpus", HAVE_LIBNUMA_SUPPORT),
 	FEATURE_STATUS("zlib", HAVE_ZLIB_SUPPORT),
 	FEATURE_STATUS("zstd", HAVE_ZSTD_SUPPORT),
+	FEATURE_STATUS("rust", HAVE_RUST_SUPPORT),
 
 	/* this should remain at end, to know the array end */
 	FEATURE_STATUS(NULL, _)