CMake: Set required toolchain and processor flags globally, instead of per-target#13987

Merged

0xc0170 merged 9 commits intoARMmbed:masterfrom mbed-ce:cmake-global-options

Dec 10, 2020

+449-781

Commits on Dec 8, 2020

Fix some formatting issues.
multiplemonomials
committed

Commits on Dec 10, 2020

Make sure all _INIT flags end with a space to fix ARMClang build error.
multiplemonomials
committed