From 60e7b40edc04a70efaa0f2ef0af69283e0e007e6 Mon Sep 17 00:00:00 2001
From: Gregory King <greg.james.king@gmail.com>
Date: Mon, 17 Mar 2014 13:04:18 -0700
Subject: [PATCH] Updated CMakeLists.txt to fix ValveSoftware/vogl/issues/16;

src/CMakeLists.txt:
 (1) Added cmake variable HAS_UPDATED_LIBUNWIND;
 (2) Added message explaining what HAS_UPDATED_LIBUNWIND does;
 (3) Moved add_subdirectory(libbacktrace), add_subdirectory(libbacktrace_test);
     below other add_subdirectory(...) commands;

src/libbacktrace/CMakeLists.txt:
 (1) add_definitions(-DCMAKE_HAS_UPDATED_LIBUNWIND) if HAS_UPDATED_LIBUNWIND=true

src/libbacktrace/btrace.cpp:
 (1) added ifdef check CMAKE_HAS_UPDATED_LIBUNWIND
---
 src/CMakeLists.txt              | 11 ++++++++++-
 src/libbacktrace/CMakeLists.txt | 11 +++++++++--
 src/libbacktrace/btrace.cpp     |  2 +-
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a684355..fd198d3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,6 +3,13 @@ cmake_minimum_required(VERSION 2.8)
 
 set(SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
 
+option(HAS_UPDATED_LIBUNWIND "Build using unw_backtrace_skip" FALSE)
+
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
+
+find_package(LibLZMA REQUIRED)
+find_package(TinyXML REQUIRED)
+
 message("")
 message("cmake options:")
 message("  -DCMAKE_BUILD_TYPE=[debug|release]: Build debug or release.")
@@ -14,6 +21,7 @@ message("  -DBUILD_X64=[On|Off]: Build 32 or 64-bit.")
 message("  -DCLANG_ANALYZE=[On|Off]: Do clang analyze build (will not link).")
 message("  -DCLANG_EVERYTHING=[On|Off]: Do clang build with -Weverything.")
 message("  -DUSE_TELEMETRY=[On|Off]: Build with Telemetry.")
+message("  -DHAS_UPDATED_LIBUNWIND=[On|Off]: Build using unw_backtrace_skip (from valve patched libunwind)")
 message("")
 
 #
@@ -32,7 +40,8 @@ add_subdirectory(voglserver)
 add_subdirectory(voglcmd)
 add_subdirectory(glxspheres)
 add_subdirectory(vogleditor)
-
 add_subdirectory(libbacktrace)
 add_subdirectory(libbacktrace_test)
 
+add_subdirectory(libbacktrace)
+add_subdirectory(libbacktrace_test)
diff --git a/src/libbacktrace/CMakeLists.txt b/src/libbacktrace/CMakeLists.txt
index 544039a..9968e91 100644
--- a/src/libbacktrace/CMakeLists.txt
+++ b/src/libbacktrace/CMakeLists.txt
@@ -159,6 +159,7 @@ include_directories (
     ${SRC_DIR}/voglcore
     ${LIBUNWIND_INCLUDE_DIR}
 )
+
 add_library (backtrace STATIC EXCLUDE_FROM_ALL
     ${BACKTRACE_FILE}
     ${FORMAT_FILE}
@@ -173,10 +174,16 @@ add_library (backtrace STATIC EXCLUDE_FROM_ALL
     btrace.cpp
     libelftc_dem_gnu3.c
 )
+
+if(HAS_UPDATED_LIBUNWIND)
+  add_definitions(-DCMAKE_HAS_UPDATED_LIBUNWIND)
+endif(HAS_UPDATED_LIBUNWIND)
+
+
 target_link_libraries(backtrace voglcore)
 
-find_library(LIBUNWIND_LIBRARY libunwind.a)
-target_link_libraries(backtrace ${LIBUNWIND_LIBRARY})
+find_library(LIBUNWIND_LIBRARY libunwind)
+target_link_libraries(backtrace ${LIBUNWIND_LIBRARY} ${LIBLZMA_LIBRARIES})
 
 set_target_properties (backtrace PROPERTIES
     COMPILE_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}"
diff --git a/src/libbacktrace/btrace.cpp b/src/libbacktrace/btrace.cpp
index 94f4dd9..c9a3340 100644
--- a/src/libbacktrace/btrace.cpp
+++ b/src/libbacktrace/btrace.cpp
@@ -75,7 +75,7 @@ btrace_glinfo& btrace_get_glinfo()
 int
 btrace_get(uintptr_t *addrs, size_t count_addrs, uint32_t addrs_to_skip)
 {
-#if 1
+#ifdef CMAKE_HAS_UPDATED_LIBUNWIND
     return unw_backtrace_skip((void **)addrs, (int)count_addrs, addrs_to_skip);
 #else
     size_t count = 0;
-- 
2.43.0