[riot-notifications] [RIOT-OS/RIOT] cpu/msp430_common: Prevent conflicting defines (#15399)

Marian Buschsieweke notifications at github.com
Fri Nov 6 21:12:35 CET 2020

### Contribution description

`irq_arch.h` so far includes`cpu.h`, which in term includes the vendor header files. Those are needed to get the GIE `#define` (general interrupt enable bit). However, the vendor files use fancy defines like `#define N (0x0004)` that easily conflict with application code. Due to the widespread use of the IRQ API, it is better to not include the vendor files in `irq_arch.h`.

This PR adds a local `#define` for the GIE bit and uses this instead of including `cpu.h`.

### Testing procedure

Binaries shouldn't change.

### Issues/PRs references

Fixes compilation on MSP430 with https://github.com/RIOT-OS/RIOT/pull/15327
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-- Commit Summary --

  * cpu/msp430_common: Prevent conflicting defines

-- File Changes --

    M cpu/msp430_common/include/irq_arch.h (6)

-- Patch Links --


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