perf tools: Integrating the CoreSight decoding library

The Open CoreSight Decoding Library (openCSD) is a free and open library
to decode traces collected by the CoreSight hardware infrastructure.

This patch adds the required mechanic to recognise the presence of the
openCSD library on a system and set up miscellaneous flags to be used in
the compilation of the trace decoding feature.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Link: http://lkml.kernel.org/r/1516211539-5166-2-git-send-email-mathieu.poirier@linaro.org
Link: http://lkml.kernel.org/r/1516635644-24819-1-git-send-email-mathieu.poirier@linaro.org
[ Merged missing test-libopencsd.c file, provided later by Mathieu ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 21 insertions, 2 deletions

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index e52fcefee379..c378f003b007 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -66,7 +66,8 @@ FEATURE_TESTS_BASIC :=                  \
         bpf                             \
         sched_getcpu                    \
         sdt                             \
-        setns
+        setns                           \
+        libopencsd
 
 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
 # of all feature tests
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index cff38f342283..59585fe20221 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -52,7 +52,8 @@ FILES=                                          \
          test-cxx.bin                           \
          test-jvmti.bin                         \
          test-sched_getcpu.bin                  \
-         test-setns.bin
+         test-setns.bin                         \
+         test-libopencsd.bin
 
 FILES := $(addprefix $(OUTPUT),$(FILES))
 
@@ -104,6 +105,10 @@ $(OUTPUT)test-sched_getcpu.bin:
 $(OUTPUT)test-setns.bin:
         $(BUILD)
 
+$(OUTPUT)test-libopencsd.bin:
+        $(BUILD) # -lopencsd_c_api -lopencsd provided by
+                 # $(FEATURE_CHECK_LDFLAGS-libopencsd)
+
 DWARFLIBS := -ldw
 ifeq ($(findstring -static,${LDFLAGS}),-static)
 DWARFLIBS += -lelf -lebl -lz -llzma -lbz2
diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index 6fdf83263ab7..8dc20a61341f 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -162,6 +162,10 @@
 # include "test-setns.c"
 #undef main
 
+#define main main_test_libopencsd
+# include "test-libopencsd.c"
+#undef main
+
 int main(int argc, char *argv[])
 {
         main_test_libpython();
@@ -199,6 +203,7 @@ int main(int argc, char *argv[])
         main_test_sched_getcpu();
         main_test_sdt();
         main_test_setns();
+        main_test_libopencsd();
 
         return 0;
 }
diff --git a/tools/build/feature/test-libopencsd.c b/tools/build/feature/test-libopencsd.c
new file mode 100644
index 000000000000..5ff1246e6194
--- /dev/null
+++ b/tools/build/feature/test-libopencsd.c
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <opencsd/c_api/opencsd_c_api.h>
+
+int main(void)
+{
+        (void)ocsd_get_version();
+        return 0;
+}