hardcoded .ref for gcc intrinsics
no dots in labels
external builtins (__c6xabi_*) - first step
eclipse - project-specific settings
issue #5, gcc intrinsics are not listed as external
long is 40-bit long
small structs arguments and return values should not be passed in registers
rules for passing and returning struct to/from a function are different for EABI and COFFABI
initial resolution for Issue #10