perf build: Add feature detection for libelf's elf_getshdrstrndx()

That appeared after 0.140, and will be used in the SDT code, so, to
avoid bisection break on older systems, add a feature detection and
provide a stub with a pr_debug() to keep it building.

Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-80y0eldgweorqnwha9rvfxjr@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 18 insertions, 0 deletions

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 57c8f98874e8..3dd529bb0604 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -40,6 +40,7 @@ FEATURE_TESTS_BASIC :=			\
         libbfd                          \
         libelf                          \
         libelf-getphdrnum               \
+        libelf-getshdrstrndx            \
         libelf-mmap                     \
         libnuma                         \
         numa_num_possible_cpus          \
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 3d88f09e188b..674711629ef0 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -17,6 +17,7 @@ FILES=					\
         test-cplus-demangle.bin         \
         test-libelf.bin                 \
         test-libelf-getphdrnum.bin      \
+        test-libelf-getshdrstrndx.bin   \
         test-libelf-mmap.bin            \
         test-libnuma.bin                \
         test-numa_num_possible_cpus.bin \
@@ -98,6 +99,9 @@ $(OUTPUT)test-libelf-mmap.bin:
 $(OUTPUT)test-libelf-getphdrnum.bin:
         $(BUILD) -lelf
 
+$(OUTPUT)test-libelf-getshdrstrndx.bin:
+        $(BUILD) -lelf
+
 $(OUTPUT)test-libnuma.bin:
         $(BUILD) -lnuma
 
diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index a282e8cb84f3..7433cca33306 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -49,6 +49,10 @@
 # include "test-libelf-getphdrnum.c"
 #undef main
 
+#define main main_test_libelf_getshdrstrndx
+# include "test-libelf-getshdrstrndx.c"
+#undef main
+
 #define main main_test_libunwind
 # include "test-libunwind.c"
 #undef main
@@ -149,6 +153,7 @@ int main(int argc, char *argv[])
         main_test_dwarf();
         main_test_dwarf_getlocations();
         main_test_libelf_getphdrnum();
+        main_test_libelf_getshdrstrndx();
         main_test_libunwind();
         main_test_libaudit();
         main_test_libslang();
diff --git a/tools/build/feature/test-libelf-getshdrstrndx.c b/tools/build/feature/test-libelf-getshdrstrndx.c
new file mode 100644
index 000000000000..f0c3b47cce28
--- /dev/null
+++ b/tools/build/feature/test-libelf-getshdrstrndx.c
@@ -0,0 +1,8 @@
+#include <libelf.h>
+
+int main(void)
+{
+        size_t dst;
+
+        return elf_getshdrstrndx(0, &dst);
+}