Allow platform configurations to define compiler flags for AS rules.

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Allow platform configurations to define compiler flags for AS rules. #14

Closed eblanton closed 7 years ago

eblanton commented 7 years ago

Platforms that set ASCFLAGS will have this variable passed to CC-as-AS at compile time, which is necessary on Cortex-M processors with arm-none-eabi-gcc to set thumb and processor-specific opcode generation.