Michel reported an issue where his code is using the __ARM_FEATURE_CMSE macro to determine for which domain (S or NS) a file is compiled for.
This raised the concern whether the current TF-M way to define secure and non secure build domain is right.
Currently TF-M build-system uses the macro __DOMAIN_NS to signal to the code which domain a file is compiled for. Also the build-system sets the --mcmse compiler flag for both secure and non-secure code.
Based on ARM®v8-M Security Extensions: Requirements on Development Tools the current usage of the --mcmse flag is wrong, but using the __DOMAIN_NS macro can not be avoided as the __ARM_FEATURE_CMSE macro is V8M architecture specific.
- Fix the build-system to not define the --mcmse flag for non-secure projects.