Currently only has the linker flag --gc-sections defined which tells
the linker to omit dead code. Depending on the application this leads
to significant reduction of code size.
Linker warnings usually means something does not get placed where it is
supposed to and the most likely result is a broken binary.
Linker warnings should be treated as serious problems with the program
and should be solved before the program is tested on actual hardware.
- removed coretx-m[0|3|4]
- moved their content to cortexm_common
- adjusted cortex Makefiles to this new name
- adjusted cortex Makefiles new structure
