Fix comparison between unsigned subtraction and the value 0 #878

	#
	# Copyright 2022 Paul Guyot <[email protected]>
	#
	# SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
	#

	name: STM32 Build

	on:
	push:
	paths:
	- '.github/workflows/stm32-build.yaml'
	- 'CMakeLists.txt'
	- 'src/platforms/stm32/**'
	- 'src/libAtomVM/**'
	pull_request:
	paths:
	- '.github/workflows/stm32-build.yaml'
	- 'CMakeLists.txt'
	- 'src/platforms/stm32/**'
	- 'src/libAtomVM/**'

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref != 'refs/heads/main' && github.ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	stm32:
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/cache@v4
	id: builddeps-cache
	with:
	path: \|
	/home/runner/libopencm3
	key: ${{ runner.os }}-build-deps

	- uses: erlef/setup-beam@v1
	with:
	otp-version: "27"
	hexpm-mirrors: \|
	https://builds.hex.pm
	https://repo.hex.pm
	https://cdn.jsdelivr.net/hex

	- name: "apt update"
	run: sudo apt update

	- name: "Install deps"
	run: sudo apt install -y cmake gperf gcc-arm-none-eabi

	- name: Checkout and build libopencm3
	if: ${{ steps.builddeps-cache.outputs.cache-hit != 'true' }}
	working-directory: /home/runner
	run: \|
	set -euo pipefail
	cd /home/runner
	test -d libopencm3 && rm -fr libopencm3
	git clone https://github.com/libopencm3/libopencm3.git -b v0.8.0
	cd libopencm3
	make

	- name: Checkout repo
	uses: actions/checkout@v4

	- name: Build
	shell: bash
	working-directory: ./src/platforms/stm32/
	run: \|
	set -euo pipefail
	mkdir build
	cd build
	# -DAVM_WARNINGS_ARE_ERRORS=ON
	cmake .. -DCMAKE_TOOLCHAIN_FILE=cmake/arm-toolchain.cmake -DLIBOPENCM3_DIR=/home/runner/libopencm3
	make -j

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