tools/perf/build: Split out feature check: 'gtk2'

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-gfwzurn7wywiviLp7Swyyqsy@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

tools/perf/config/Makefile

@@ -116,6 +116,7 @@ FEATURE_TESTS =				\
 	libunwind			\
 	libaudit			\
 	libslang			\
+	gtk2				\
 	libnuma
 
 $(foreach test,$(FEATURE_TESTS),$(call feature_check,$(test),$(test)))
@@ -294,7 +295,7 @@ endif
 
 ifndef NO_GTK2
   FLAGS_GTK2=$(CFLAGS) $(LDFLAGS) $(EXTLIBS) $(shell pkg-config --libs --cflags gtk+-2.0 2>/dev/null)
-  ifneq ($(call try-cc,$(SOURCE_GTK2),$(FLAGS_GTK2),gtk2),y)
+  ifneq ($(feature-gtk2), 1)
     msg := $(warning GTK2 not found, disables GTK2 support. Please install gtk2-devel or libgtk2.0-dev);
     NO_GTK2 := 1
   else

tools/perf/config/feature-checks/Makefile

@@ -14,6 +14,7 @@ FILES=					\
 	test-libunwind			\
 	test-libaudit			\
 	test-libslang			\
+	test-gtk2			\
 	test-libnuma
 
 CC := $(CC) -MD
@@ -69,6 +70,9 @@ test-libaudit:
 test-libslang:
 	$(BUILD) -I/usr/include/slang -lslang
 
+test-gtk2:
+	$(BUILD) $(shell pkg-config --libs --cflags gtk+-2.0 2>/dev/null)
+
 -include *.d */*.d
 
 ###############################

tools/perf/config/feature-checks/test-gtk2.c

@@ -0,0 +1,10 @@
+#pragma GCC diagnostic ignored "-Wstrict-prototypes"
+#include <gtk/gtk.h>
+#pragma GCC diagnostic error "-Wstrict-prototypes"
+
+int main(int argc, char *argv[])
+{
+        gtk_init(&argc, &argv);
+
+        return 0;
+}