Fix cross building.

When we stopped using CXXFLAGS in eh_personality.s generation, we lost
the ability to propagate -m32 or -target through, so cross-compile
didn't work.  These flags are now passed through correctly, so (so
'-pipe -O2' will appear as two arguments, rather than being combined as
a single value that then causes clang to abort with an unknown argument
error, which was the original motivation for this change).

This is the correct fix for #177

CMakeLists.txt

@@ -316,8 +316,9 @@ if (ENABLE_OBJCXX)
 				set(ENABLE_OBJCXX false)
 			endif()
 		endif ()
+		separate_arguments(EH_PERSONALITY_FLAGS NATIVE_COMMAND ${CMAKE_CXX_FLAGS})
 		add_custom_command(OUTPUT eh_trampoline.s
-			COMMAND ${CMAKE_CXX_COMPILER} -fPIC -S "${CMAKE_SOURCE_DIR}/eh_trampoline.cc" -o - -fexceptions -fno-inline | sed "s/__gxx_personality_v0/test_eh_personality/g" > "${CMAKE_BINARY_DIR}/eh_trampoline.s"
+			COMMAND ${CMAKE_CXX_COMPILER} ARGS ${EH_PERSONALITY_FLAGS} -fPIC -S "${CMAKE_SOURCE_DIR}/eh_trampoline.cc" ${EH_PERSONALITY_M32} -o - -fexceptions -fno-inline | sed "s/__gxx_personality_v0/test_eh_personality/g" > "${CMAKE_BINARY_DIR}/eh_trampoline.s"
 			MAIN_DEPENDENCY eh_trampoline.cc)
 		list(APPEND libobjc_ASM_SRCS eh_trampoline.s)
 		list(APPEND libobjc_CXX_SRCS objcxx_eh.cc)