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Subject[PATCH 018/161] tools/perf/build: Split out feature check: 'libunwind'
Date
From: Ingo Molnar <mingo@kernel.org>

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-vTiatsVyva3tfgh3vhxaidxl@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
tools/perf/config/Makefile | 13 ++++++++-----
tools/perf/config/feature-checks/Makefile | 4 ++++
tools/perf/config/feature-checks/test-libunwind.c | 20 ++++++++++++++++++++
3 files changed, 32 insertions(+), 5 deletions(-)
create mode 100644 tools/perf/config/feature-checks/test-libunwind.c

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 0d7558790a02..d684a292536e 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -113,6 +113,7 @@ FEATURE_TESTS = \
dwarf \
libelf-mmap \
libelf-getphdrnum \
+ libunwind \
libnuma

$(foreach test,$(FEATURE_TESTS),$(call feature_check,$(test),$(test)))
@@ -240,15 +241,17 @@ ifneq ($(ARCH),x86)
endif

ifndef NO_LIBUNWIND
- # for linking with debug library, run like:
- # make DEBUG=1 LIBUNWIND_DIR=/opt/libunwind/
+ #
+ # For linking with debug library, run like:
+ #
+ # make DEBUG=1 LIBUNWIND_DIR=/opt/libunwind/
+ #
ifdef LIBUNWIND_DIR
LIBUNWIND_CFLAGS := -I$(LIBUNWIND_DIR)/include
LIBUNWIND_LDFLAGS := -L$(LIBUNWIND_DIR)/lib
endif

- FLAGS_UNWIND=$(LIBUNWIND_CFLAGS) $(CFLAGS) $(LIBUNWIND_LDFLAGS) $(LDFLAGS) $(EXTLIBS) $(LIBUNWIND_LIBS)
- ifneq ($(call try-cc,$(SOURCE_LIBUNWIND),$(FLAGS_UNWIND),libunwind),y)
+ ifneq ($(feature-libunwind), 1)
msg := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 0.99);
NO_LIBUNWIND := 1
endif
@@ -259,7 +262,7 @@ ifndef NO_LIBUNWIND
EXTLIBS += $(LIBUNWIND_LIBS)
CFLAGS += $(LIBUNWIND_CFLAGS)
LDFLAGS += $(LIBUNWIND_LDFLAGS)
-endif # NO_LIBUNWIND
+endif

ifndef NO_LIBAUDIT
FLAGS_LIBAUDIT = $(CFLAGS) $(LDFLAGS) -laudit
diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
index 83b3a02b64d8..d6d9570a038f 100644
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -11,6 +11,7 @@ FILES= \
test-dwarf \
test-libelf-mmap \
test-libelf-getphdrnum \
+ test-libunwind \
test-libnuma

CC := $(CC) -MD
@@ -57,6 +58,9 @@ test-libelf-getphdrnum:
test-libnuma:
$(BUILD) -lnuma

+test-libunwind:
+ $(BUILD) -lunwind -lunwind-x86_64 -lelf
+
-include *.d */*.d

###############################
diff --git a/tools/perf/config/feature-checks/test-libunwind.c b/tools/perf/config/feature-checks/test-libunwind.c
new file mode 100644
index 000000000000..562274695c76
--- /dev/null
+++ b/tools/perf/config/feature-checks/test-libunwind.c
@@ -0,0 +1,20 @@
+#include <libunwind.h>
+#include <stdlib.h>
+
+extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
+ unw_word_t ip,
+ unw_dyn_info_t *di,
+ unw_proc_info_t *pi,
+ int need_unwind_info, void *arg);
+
+
+#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)
+
+int main(void)
+{
+ unw_addr_space_t addr_space;
+ addr_space = unw_create_addr_space(NULL, 0);
+ unw_init_remote(NULL, addr_space, NULL);
+ dwarf_search_unwind_table(addr_space, 0, NULL, NULL, 0, NULL);
+ return 0;
+}
--
1.8.1.4


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