Meson cross-compilation config

Contains build settings for STM32 chips. Architectures to be added as needed.

Requires: * arm-none-eabi-gcc * arm-none-eabi-gdb * picolibc * openocd * ddd

Usage

Set up a new build directory:

git submodule add \
    https://dev.begriffs.com/git/meson-cross cross

meson setup \
    --cross-file cross/armv7m/cortex-m4/st/nucleo-f411re/cross.ini \
    --cross-file cross/armv7m/gcc.ini \
    build

The architecture also provides two helper commands, flash_cmd and debug_cmd so that your main meson.build file can be shorter:

subdir('cross/armv7m')

run_target('flash', command: [flash_cmd, /* image */])
run_target('debug', command: [debug_cmd, /* image */])