ObjFW  Diff

		AC_CHECK_LIB(objc, objc_msgSend, [
			AC_SUBST(RUNTIME_LIBS, "-lobjc")
			AC_SUBST(RUNTIME_FRAMEWORK_LIBS, "-lobjc")
		], [
			AC_MSG_ERROR([libobjc not found!])
		])

		AC_CHECK_FUNC(objc_autoreleasePoolPush, [], [
			AC_SUBST(RUNTIME_AUTORELEASE_M, "runtime/autorelease.m")
		])
		AC_CHECK_FUNC(objc_constructInstance, [], [
			AC_SUBST(RUNTIME_INSTANCE_M, "runtime/instance.m")
		])
		;;
esac

AC_CHECK_FUNCS(_Unwind_Backtrace)

AC_CHECK_FUNC(objc_autoreleasePoolPush, [], [
	AC_SUBST(RUNTIME_AUTORELEASE_M, "runtime/autorelease.m")
])
AC_CHECK_FUNC(objc_constructInstance, [], [
	AC_SUBST(RUNTIME_INSTANCE_M, "runtime/instance.m")
])

case "$host_os" in
	darwin*)
		AC_SUBST(LDFLAGS_REEXPORT, ["-Wl,-reexport-lobjfw"])
		AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
			AC_SUBST(REEXPORT_RUNTIME, ["-Wl,-reexport-lobjc"])
			AC_SUBST(REEXPORT_RUNTIME_FRAMEWORK,
				["-Wl,-reexport-lobjc"])