Enable backtrace printing on FreeBSD.

FreeBSD has supported printing backtraces for years. The API is the same
as on Linux, the only difference is that libexecinfo must be linked as a
seperate library. Since the last FreeBSD version with backtrace support
(FreeBSD 9.3) went out of support some time ago unconditionally enable
the printing.

CMakeLists.txt

@@ -47,6 +47,7 @@ set(yquake2IncludeDirectories)
 set(yquake2LinkerDirectories)
 set(yquake2LinkerFlags)
 set(yquake2ClientLinkerFlags)
+set(yquake2ServerLinkerFlags)
 set(yquake2OpenGLLinkerFlags)
 set(yquake2SDLLinkerFlags)
 set(yquake2ZLibLinkerFlags)
@@ -95,6 +96,14 @@ find_package(OpenGL REQUIRED)
 list(APPEND yquake2IncludeDirectories ${OPENGL_INCLUDE_DIR})
 list(APPEND yquake2OpenGLLinkerFlags ${OPENGL_LIBRARIES})
 
+if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "FreeBSD")
+	find_library(EXECINFO_LIBRARIES execinfo /usr/lib /usr/local/lib)
+	list(APPEND yquake2ClientLinkerFlags ${EXECINFO_LIBRARIES})
+	list(APPEND yquake2ServerLinkerFlags ${EXECINFO_LIBRARIES})
+endif()
+
+
+
 if(${ZIP_SUPPORT})
 	find_package(ZLIB REQUIRED)
 	list(APPEND yquake2IncludeDirectories ${ZLIB_INCLUDE_DIRS})
@@ -576,7 +585,7 @@ set_target_properties(q2ded PROPERTIES
 if(${CMAKE_SYSTEM_NAME} MATCHES "Windows")
 	target_link_libraries(q2ded ${yquake2LinkerFlags} ${yquake2ZLibLinkerFlags} ws2_32 winmm)
 else()
-	target_link_libraries(q2ded ${yquake2LinkerFlags} ${yquake2ZLibLinkerFlags})
+	target_link_libraries(q2ded ${yquake2LinkerFlags} ${yquake2ServerLinkerFlags} ${yquake2ZLibLinkerFlags})
 endif()
 
 # Build the game dynamic library

Makefile

@@ -503,12 +503,8 @@ ifeq ($(WITH_SDL2),yes)
 release/quake2 : CFLAGS += -DSDL2
 endif
 
-ifneq ($(YQ2_OSTYPE), Darwin)
-release/ref_gl1.so : LDFLAGS += -lGL
-endif
-
 ifeq ($(YQ2_OSTYPE), FreeBSD)
-release/quake2 : LDFLAGS += -Wl,-z,origin,-rpath='$$ORIGIN/lib'
+release/quake2 : LDFLAGS += -Wl,-z,origin,-rpath='$$ORIGIN/lib' -lexecinfo
 else ifeq ($(YQ2_OSTYPE), Linux)
 release/quake2 : LDFLAGS += -Wl,-z,origin,-rpath='$$ORIGIN/lib'
 endif
@@ -568,6 +564,10 @@ ifeq ($(WITH_ZIP),yes)
 release/q2ded : CFLAGS += $(ZIPCFLAGS) -DZIP -DNOUNCRYPT
 release/q2ded : LDFLAGS += -lz
 endif
+
+ifeq ($(YQ2_OSTYPE), FreeBSD)
+release/q2ded : LDFLAGS += -lexecinfo
+endif
 endif
 
 # ----------
@@ -611,7 +611,7 @@ ref_gl1:
 
 
 release/ref_gl1.so : CFLAGS += -fPIC
-release/ref_gl1.so : LDFLAGS += -shared
+release/ref_gl1.so : LDFLAGS += -shared -lGL
 
 ifeq ($(WITH_SDL2),yes)
 release/ref_gl1.so : CFLAGS += -DSDL2

src/backends/unix/signalhandler.c

@@ -28,13 +28,14 @@
 
 #include <signal.h>
 
-#ifdef __linux__
-#include <execinfo.h>
+#if defined(__linux__) || defined(__FreeBSD__)
+
 #endif
 
 #include "../../common/header/common.h"
 
-#ifdef __linux__
+#if defined(__linux__) || defined(__FreeBSD__)
+#include <execinfo.h>
 
 void
 printBacktrace(int sig)