Fix builds and add CI check for no-std targets#300

Closed

DrTobe wants to merge 8 commits intofortanix:masterfrom embedded-rust-iml:optional-once_cell

+150-80

Commits on Jul 18, 2023

Only use once_cell dependency when required to fix builds for no-std targets
DrTobe
committed
For once_cell, use either the std or the critical-section feature
DrTobe
committed

Commits on Jul 20, 2023

Build for thumbv7em-none-eabihf as a no_std target to check that build succeed without std support
DrTobe
committed
Make threading feature optional and do not include platform_time.h if time feature is no active
DrTobe
committed