From f67c6410d12a1829b0c6d009c848d72cd0158ee4 Mon Sep 17 00:00:00 2001
From: Christopher Ferris <cferris@google.com>
Date: Fri, 10 Jan 2014 00:43:54 -0800
Subject: [PATCH] Create a bare bones host libbacktrace on mac.

This allows the libbacktrace library to compile for host on mac.

Bug: 12474939
Change-Id: I32cbcf996e6fe9057e5065ba21f89086343704a0
---
 libbacktrace/Android.mk        | 49 +++++++++++++++++++++++-----------
 libbacktrace/Backtrace.cpp     |  2 +-
 libbacktrace/BacktraceThread.h |  1 -
 3 files changed, 35 insertions(+), 17 deletions(-)

diff --git a/libbacktrace/Android.mk b/libbacktrace/Android.mk
index a6b9c2b9a..8995fc17f 100644
--- a/libbacktrace/Android.mk
+++ b/libbacktrace/Android.mk
@@ -168,18 +168,15 @@ LOCAL_ADDITIONAL_DEPENDENCIES := \
 include $(BUILD_NATIVE_TEST)
 
 #----------------------------------------------------------------------------
-# Only linux-x86 host versions of libbacktrace supported.
+# Only x86 host versions of libbacktrace supported.
 #----------------------------------------------------------------------------
-ifeq ($(HOST_OS)-$(HOST_ARCH),linux-x86)
+ifeq ($(HOST_ARCH),x86)
 
 #----------------------------------------------------------------------------
 # The host libbacktrace library using libcorkscrew
 #----------------------------------------------------------------------------
 include $(CLEAR_VARS)
 
-LOCAL_SRC_FILES += \
-	$(common_src) \
-	Corkscrew.cpp \
 
 LOCAL_CFLAGS += \
 	$(common_cflags) \
@@ -187,21 +184,12 @@ LOCAL_CFLAGS += \
 LOCAL_CONLYFLAGS += \
 	$(common_conlyflags) \
 
-LOCAL_CPPFLAGS += \
-	$(common_cppflags) \
-
 LOCAL_C_INCLUDES := \
 	$(common_c_includes) \
-	system/core/libcorkscrew \
 
 LOCAL_SHARED_LIBRARIES := \
 	libgccdemangle \
 	liblog \
-	libcorkscrew \
-
-LOCAL_LDLIBS += \
-	-ldl \
-	-lrt \
 
 LOCAL_MODULE := libbacktrace
 LOCAL_MODULE_TAGS := optional
@@ -209,8 +197,37 @@ LOCAL_MODULE_TAGS := optional
 LOCAL_ADDITIONAL_DEPENDENCIES := \
 	$(LOCAL_PATH)/Android.mk
 
+ifeq ($(HOST_OS),linux)
+LOCAL_SRC_FILES += \
+	$(common_src) \
+	Corkscrew.cpp \
+
+LOCAL_C_INCLUDES += \
+	system/core/libcorkscrew \
+
+LOCAL_SHARED_LIBRARIES := \
+	libcorkscrew \
+
+LOCAL_CPPFLAGS += \
+	$(common_cppflags) \
+
+LOCAL_LDLIBS += \
+	-ldl \
+	-lrt \
+
+else
+LOCAL_SRC_FILES += \
+	map_info.c \
+
+endif
+
 include $(BUILD_HOST_SHARED_LIBRARY)
 
+#----------------------------------------------------------------------------
+# The host test is only supported on linux.
+#----------------------------------------------------------------------------
+ifeq ($(HOST_OS),linux)
+
 #----------------------------------------------------------------------------
 # libbacktrace host test library, all optimizations turned off
 #----------------------------------------------------------------------------
@@ -263,4 +280,6 @@ LOCAL_ADDITIONAL_DEPENDENCIES := \
 
 include $(BUILD_HOST_NATIVE_TEST)
 
-endif # HOST_OS-HOST_ARCH == linux-x86
+endif # HOST_OS == linux
+
+endif # HOST_ARCH == x86
diff --git a/libbacktrace/Backtrace.cpp b/libbacktrace/Backtrace.cpp
index fa85872d0..20667e0cc 100644
--- a/libbacktrace/Backtrace.cpp
+++ b/libbacktrace/Backtrace.cpp
@@ -87,7 +87,7 @@ std::string Backtrace::GetFunctionName(uintptr_t pc, uintptr_t* offset) {
   if (!func_name.empty()) {
 #if defined(__APPLE__)
     // Mac OS' __cxa_demangle demangles "f" as "float"; last tested on 10.7.
-    if (symbol_name[0] != '_') {
+    if (func_name[0] != '_') {
       return func_name;
     }
 #endif
diff --git a/libbacktrace/BacktraceThread.h b/libbacktrace/BacktraceThread.h
index bcb56c96c..a4b6ecb9c 100644
--- a/libbacktrace/BacktraceThread.h
+++ b/libbacktrace/BacktraceThread.h
@@ -18,7 +18,6 @@
 #define _LIBBACKTRACE_BACKTRACE_THREAD_H
 
 #include <inttypes.h>
-#include <pthread.h>
 #include <sys/types.h>
 
 #include "Backtrace.h"