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Update README.md #34

	name: Build RISC-V GNU Toolchain

	on:
	push:
	branches: [ main, dev ]

	jobs:
	build-riscv-toolchain:
	runs-on: ubuntu-24.04
	timeout-minutes: 180

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Install dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -y autoconf automake autotools-dev curl python3 python3-pip \
	libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf \
	libtool patchutils bc zlib1g-dev libexpat-dev ninja-build git cmake libglib2.0-dev libslirp-dev

	- name: Clone riscv-gnu-toolchain
	run: \|
	git clone https://github.com/riscv/riscv-gnu-toolchain
	cd riscv-gnu-toolchain

	- name: Configure and build
	run: \|
	cd riscv-gnu-toolchain
	./configure --prefix=/opt/riscv/gcc15 --with-arch=rv32imac_zicsr_zifencei_zba_zbb_zbkb_zbs --with-abi=ilp32
	make -j$(nproc)
	sudo mkdir -p /opt/riscv/gcc15
	sudo chown $(whoami) /opt/riscv/gcc15

	- name: Package toolchain
	run: \|
	cd /opt/riscv
	tar -czvf riscv-gnu-toolchain.tar.gz gcc15

	- name: Upload artifact
	uses: actions/upload-artifact@v4
	with:
	name: riscv-toolchain
	path: /opt/riscv/riscv-gnu-toolchain.tar.gz
	retention-days: 7 # 制品保留天数