Manually integrated @gtbass OSX changes.

.gitignore

@@ -1,3 +1,5 @@
 .build/
 .debug/
 .svn/
+tags
+.DS_Store

include/bx/sem.h

@@ -42,8 +42,8 @@ namespace bx
 
 		bool wait(int32_t _msecs = -1)
 		{
-#if BX_PLATFORM_NACL
-			BX_CHECK(-1 == _msecs, "NaCl doesn't support sem_timedwait at this moment.");
+#if BX_PLATFORM_NACL || BX_PLATFORM_OSX
+			BX_CHECK(-1 == _msecs, "NaCl and OSX don't support sem_timedwait at this moment.");
 			return 0 == sem_wait(&m_handle);
 #else
 			if (0 > _msecs)

include/compat/osx/unordered_map

@@ -0,0 +1 @@
+#include <tr1/unordered_map>

premake/toolchain.lua

@@ -283,5 +283,16 @@ function toolchain(_buildDir, _libDir)
 			"_XBOX",
 		}
 
+	configuration { "macosx" }
+		buildoptions {
+			"-U__STRICT_ANSI__",
+			"-Wunused-value",
+			"-msse2",
+		}
+		includedirs { bxDir .. "include/compat/osx" }
+		targetdir (_buildDir .. "osx" .. "/bin")
+		objdir (_buildDir .. "osx" .. "/obj")
+		libdirs { _libDir .. "lib/osx" }
+
 	configuration {} -- reset configuration
 end