dwarf_getlocations support in libdw is more than 10 years old. Make
libdw imply dwarf_getlocations support and simplify build logic.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/build/Makefile.feature                  |  2 --
 tools/build/feature/Makefile                  |  4 ----
 tools/build/feature/test-all.c                |  5 -----
 tools/build/feature/test-dwarf_getlocations.c | 13 -------------
 tools/build/feature/test-libdw.c              | 14 +++++++++++++-
 tools/perf/Makefile.config                    | 10 ++--------
 6 files changed, 15 insertions(+), 33 deletions(-)
 delete mode 100644 tools/build/feature/test-dwarf_getlocations.c

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index db3695ec5f83..cf6a967575ea 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -31,7 +31,6 @@ endef
 FEATURE_TESTS_BASIC :=                  \
         backtrace                       \
         libdw                           \
-        dwarf_getlocations              \
         dwarf_getcfi                    \
         eventfd                         \
         fortify-source                  \
@@ -120,7 +119,6 @@ endif
 
 FEATURE_DISPLAY ?=              \
          libdw                  \
-         dwarf_getlocations     \
          glibc                  \
          libbfd                 \
          libbfd-buildid		\
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 7bb409c1f7e6..7683d171f744 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -6,7 +6,6 @@ FILES=                                          \
          test-backtrace.bin                     \
          test-bionic.bin                        \
          test-libdw.bin                         \
-         test-dwarf_getlocations.bin            \
          test-dwarf_getcfi.bin                  \
          test-eventfd.bin                       \
          test-fortify-source.bin                \
@@ -185,9 +184,6 @@ endif
 $(OUTPUT)test-libdw.bin:
 	$(BUILD) $(DWLIBS)
 
-$(OUTPUT)test-dwarf_getlocations.bin:
-	$(BUILD) $(DWLIBS)
-
 $(OUTPUT)test-dwarf_getcfi.bin:
 	$(BUILD) $(DWLIBS)
 
diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index 863c82516433..59ef3d7fe6a4 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -42,10 +42,6 @@
 # include "test-libdw.c"
 #undef main
 
-#define main main_test_dwarf_getlocations
-# include "test-dwarf_getlocations.c"
-#undef main
-
 #define main main_test_eventfd
 # include "test-eventfd.c"
 #undef main
@@ -184,7 +180,6 @@ int main(int argc, char *argv[])
 	main_test_gettid();
 	main_test_glibc();
 	main_test_libdw();
-	main_test_dwarf_getlocations();
 	main_test_eventfd();
 	main_test_libelf_getphdrnum();
 	main_test_libelf_gelf_getnote();
diff --git a/tools/build/feature/test-dwarf_getlocations.c b/tools/build/feature/test-dwarf_getlocations.c
deleted file mode 100644
index 78fb4a1fa68c..000000000000
--- a/tools/build/feature/test-dwarf_getlocations.c
+++ /dev/null
@@ -1,13 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <stdlib.h>
-#include <elfutils/libdw.h>
-
-int main(void)
-{
-	Dwarf_Addr base, start, end;
-	Dwarf_Attribute attr;
-	Dwarf_Op *op;
-        size_t nops;
-	ptrdiff_t offset = 0;
-        return (int)dwarf_getlocations(&attr, offset, &base, &start, &end, &op, &nops);
-}
diff --git a/tools/build/feature/test-libdw.c b/tools/build/feature/test-libdw.c
index 793f4ac49514..83ea5d5f235d 100644
--- a/tools/build/feature/test-libdw.c
+++ b/tools/build/feature/test-libdw.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+#include <stdlib.h>
 #include <dwarf.h>
 #include <elfutils/libdw.h>
 #include <elfutils/libdwfl.h>
@@ -22,7 +23,18 @@ int test_libdw_unwind(void)
 	return 0;
 }
 
+int test_libdw_getlocations(void)
+{
+	Dwarf_Addr base, start, end;
+	Dwarf_Attribute attr;
+	Dwarf_Op *op;
+	size_t nops;
+	ptrdiff_t offset = 0;
+
+	return (int)dwarf_getlocations(&attr, offset, &base, &start, &end, &op, &nops);
+}
+
 int main(void)
 {
-	return test_libdw() + test_libdw_unwind();
+	return test_libdw() + test_libdw_unwind() + test_libdw_getlocations();
 }
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 93fd6bd74d20..903de48c140d 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -161,8 +161,6 @@ ifeq ($(findstring -static,${LDFLAGS}),-static)
 endif
 FEATURE_CHECK_CFLAGS-libdw := $(LIBDW_CFLAGS)
 FEATURE_CHECK_LDFLAGS-libdw := $(LIBDW_LDFLAGS) $(DWARFLIBS)
-FEATURE_CHECK_CFLAGS-dwarf_getlocations := $(LIBDW_CFLAGS)
-FEATURE_CHECK_LDFLAGS-dwarf_getlocations := $(LIBDW_LDFLAGS) $(DWARFLIBS)
 FEATURE_CHECK_CFLAGS-dwarf_getcfi := $(LIBDW_CFLAGS)
 FEATURE_CHECK_LDFLAGS-dwarf_getcfi := $(LIBDW_LDFLAGS) $(DWARFLIBS)
 
@@ -464,15 +462,11 @@ else
   else
     ifneq ($(feature-libdw), 1)
       ifndef NO_LIBDW
-        $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev)
+        $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.157, disables dwarf support. Please install new elfutils-devel/libdw-dev)
         NO_LIBDW := 1
       endif
     else
-      ifneq ($(feature-dwarf_getlocations), 1)
-        $(warning Old libdw.h, finding variables at given 'perf probe' point will not work, install elfutils-devel/libdw-dev >= 0.157)
-      else
-        CFLAGS += -DHAVE_DWARF_GETLOCATIONS_SUPPORT
-      endif # dwarf_getlocations
+      CFLAGS += -DHAVE_DWARF_GETLOCATIONS_SUPPORT
       ifneq ($(feature-dwarf_getcfi), 1)
         $(warning Old libdw.h, finding variables at given 'perf probe' point will not work, install elfutils-devel/libdw-dev >= 0.142)
       else
-- 
2.47.0.rc0.187.ge670bccf7e-goog