[PATCH 5/6] perf tools: Setup default dwarf post unwinder

From: Jiri Olsa
Date: Wed Feb 19 2014 - 10:54:34 EST

Factor NO_LIBDW_DWARF_UNWIND makefile variable and code
that selects default DWARf post unwinder based on detected
features (libdw and libunwind support)

If both are detected the libunwind is selected as default.
Simple 'make' will try to add:
- libunwind unwinder if present
- libdw unwinder if present
- disable dwarf unwind if non of libunwind and libdw
libraries are present

If one of the DWARF unwind libraries is detected, message is
displayed which one (libunwind/libdw) is compiled in.

Examples:
- compile in libdw unwinder if present:

$ make NO_LIBUNWIND=1

- compile in libdw (with libdw installation directory) unwinder if present:

$ make LIBDW_DIR=/opt/elfutils/ NO_LIBUNWIND=1
BUILD: Doing 'make -j4' parallel build

Auto-detecting system features:
... dwarf: [ on ]
... glibc: [ on ]
... gtk2: [ on ]
... libaudit: [ on ]
... libbfd: [ on ]
... libelf: [ on ]
... libnuma: [ on ]
... libperl: [ on ]
... libpython: [ on ]
... libslang: [ on ]
... libunwind: [ on ]
... libdw-dwarf-unwind: [ on ]
... DWARF post unwind library: libdw

- disable post dwarf unwind completely:

$ make NO_LIBUNWIND=1 NO_LIBDW_DWARF_UNWIND=1
BUILD: Doing 'make -j4' parallel build

Auto-detecting system features:
... dwarf: [ on ]
... glibc: [ on ]
... gtk2: [ on ]
... libaudit: [ on ]
... libbfd: [ on ]
... libelf: [ on ]
... libnuma: [ on ]
... libperl: [ on ]
... libpython: [ on ]
... libslang: [ on ]
... libunwind: [ on ]
... libdw-dwarf-unwind: [ on ]
... DWARF post unwind library: libunwind

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jean Pihet <jean.pihet@xxxxxxxxxx>
---
tools/perf/Makefile.perf | 5 +--
tools/perf/arch/x86/Makefile | 6 ++--
tools/perf/config/Makefile | 78 ++++++++++++++++++++++++++++++++++----------
3 files changed, 66 insertions(+), 23 deletions(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 2dff0b8..1f7ec48 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -61,9 +61,6 @@ include config/utilities.mak
# Define NO_LIBDW_DWARF_UNWIND if you do not want libdw support
# for dwarf backtrace post unwind.

-# temporarily disabled
-NO_LIBDW_DWARF_UNWIND := 1
-
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(shell pwd)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
@@ -412,7 +409,7 @@ endif
LIB_OBJS += $(OUTPUT)tests/code-reading.o
LIB_OBJS += $(OUTPUT)tests/sample-parsing.o
LIB_OBJS += $(OUTPUT)tests/parse-no-sample-id-all.o
-ifndef NO_LIBUNWIND
+ifndef NO_DWARF_UNWIND
ifeq ($(ARCH),x86)
LIB_OBJS += $(OUTPUT)tests/dwarf-unwind.o
endif
diff --git a/tools/perf/arch/x86/Makefile b/tools/perf/arch/x86/Makefile
index 37c4652..1641542 100644
--- a/tools/perf/arch/x86/Makefile
+++ b/tools/perf/arch/x86/Makefile
@@ -4,12 +4,14 @@ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
endif
ifndef NO_LIBUNWIND
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o
-LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o
-LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o
endif
ifndef NO_LIBDW_DWARF_UNWIND
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libdw.o
endif
+ifndef NO_DWARF_UNWIND
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o
+endif
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/header.o
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/tsc.o
LIB_H += arch/$(ARCH)/util/tsc.h
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 3936a4b..aa778bf 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -159,7 +159,8 @@ CORE_FEATURE_TESTS = \
libunwind \
on-exit \
stackprotector-all \
- timerfd
+ timerfd \
+ libdw-dwarf-unwind

LIB_FEATURE_TESTS = \
dwarf \
@@ -172,7 +173,8 @@ LIB_FEATURE_TESTS = \
libperl \
libpython \
libslang \
- libunwind
+ libunwind \
+ libdw-dwarf-unwind

VF_FEATURE_TESTS = \
backtrace \
@@ -280,6 +282,12 @@ else
msg := $(error No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static);
endif
else
+ ifndef NO_LIBDW_DWARF_UNWIND
+ ifneq ($(feature-libdw-dwarf-unwind),1)
+ NO_LIBDW_DWARF_UNWIND := 1
+ msg := $(warning No libdw dwarf unwind found, Please install elfutils-devel/libdw-dev >= 0.158.);
+ endif
+ endif
ifneq ($(feature-dwarf), 1)
msg := $(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);
NO_DWARF := 1
@@ -315,25 +323,51 @@ endif # NO_LIBELF

ifndef NO_LIBUNWIND
ifneq ($(feature-libunwind), 1)
- msg := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 1.1);
+ msg := $(warning No libunwind found. Please install libunwind-dev[el] >= 1.1);
NO_LIBUNWIND := 1
+ endif
+endif
+
+dwarf-post-unwind := 1
+dwarf-post-unwind-text := BUG
+
+# setup DWARF post unwinder
+ifdef NO_LIBUNWIND
+ ifdef NO_LIBDW_DWARF_UNWIND
+ msg := $(warning Disabling post unwind, no support found.);
+ dwarf-post-unwind := 0
else
- ifeq ($(ARCH),arm)
- $(call feature_check,libunwind-debug-frame)
- ifneq ($(feature-libunwind-debug-frame), 1)
- msg := $(warning No debug_frame support found in libunwind);
- CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
- endif
- else
- # non-ARM has no dwarf_find_debug_frame() function:
+ dwarf-post-unwind-text := libdw
+ endif
+else
+ dwarf-post-unwind-text := libunwind
+ # Enable libunwind support by default.
+ ifndef NO_LIBDW_DWARF_UNWIND
+ NO_LIBDW_DWARF_UNWIND := 1
+ endif
+endif
+
+ifeq ($(dwarf-post-unwind),1)
+ CFLAGS += -DHAVE_DWARF_UNWIND_SUPPORT
+else
+ NO_DWARF_UNWIND := 1
+endif
+
+ifndef NO_LIBUNWIND
+ ifeq ($(ARCH),arm)
+ $(call feature_check,libunwind-debug-frame)
+ ifneq ($(feature-libunwind-debug-frame), 1)
+ msg := $(warning No debug_frame support found in libunwind);
CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
endif
-
- CFLAGS += -DHAVE_DWARF_UNWIND_SUPPORT -DHAVE_LIBUNWIND_SUPPORT
- EXTLIBS += $(LIBUNWIND_LIBS)
- CFLAGS += $(LIBUNWIND_CFLAGS)
- LDFLAGS += $(LIBUNWIND_LDFLAGS)
- endif # ifneq ($(feature-libunwind), 1)
+ else
+ # non-ARM has no dwarf_find_debug_frame() function:
+ CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
+ endif
+ CFLAGS += -DHAVE_LIBUNWIND_SUPPORT
+ EXTLIBS += $(LIBUNWIND_LIBS)
+ CFLAGS += $(LIBUNWIND_CFLAGS)
+ LDFLAGS += $(LIBUNWIND_LDFLAGS)
endif

ifndef NO_LIBAUDIT
@@ -620,6 +654,10 @@ endef
PERF_FEATURES := $(foreach feat,$(LIB_FEATURE_TESTS),feature-$(feat)($(feature-$(feat))))
PERF_FEATURES_FILE := $(shell touch $(OUTPUT)PERF-FEATURES; cat $(OUTPUT)PERF-FEATURES)

+ifeq ($(dwarf-post-unwind),1)
+ PERF_FEATURES += dwarf-post-unwind($(dwarf-post-unwind-text))
+endif
+
# The $(display_lib) controls the default detection message
# output. It's set if:
# - detected features differes from stored features from
@@ -650,6 +688,10 @@ ifeq ($(display_lib),1)
$(info )
$(info Auto-detecting system features:)
$(foreach feat,$(LIB_FEATURE_TESTS),$(call feature_print_status,$(feat),))
+
+ ifeq ($(dwarf-post-unwind),1)
+ $(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
+ endif
endif

ifeq ($(display_vf),1)
@@ -659,6 +701,8 @@ ifeq ($(display_vf),1)
$(call feature_print_var,bindir)
$(call feature_print_var,libdir)
$(call feature_print_var,sysconfdir)
+ $(call feature_print_var,LIBUNWIND_DIR)
+ $(call feature_print_var,LIBDW_DIR)
endif

ifeq ($(display_lib),1)
--
1.8.3.1

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