git riscv-gnu-toolchain

$ git clone https://gitee.com/mirrors/riscv-gnu-toolchain

进入源码目录：

$ cd riscv-gnu-toolchain

注意上面 clone 的主仓库并不包含子仓库的内容，所以需要继续更新子仓库。注意这里首先排除了 qemu 这个子仓库，一来因为 qemu 完整下载太大；二来 qemu 对 toolchain 的编译本身来说其实并不需要。

$ git rm qemu
$ git submodule update --init --recursive

耐心等待子仓库下载完成。

[root@centos7 riscv_build]# git clone https://gitee.com/mirrors/riscv-gnu-toolchain
Cloning into 'riscv-gnu-toolchain'...
remote: Enumerating objects: 51, done.
remote: Counting objects: 100% (51/51), done.
remote: Compressing objects: 100% (51/51), done.
remote: Total 8695 (delta 15), reused 0 (delta 0), pack-reused 8644
Receiving objects: 100% (8695/8695), 5.03 MiB | 8.94 MiB/s, done.
Resolving deltas: 100% (4719/4719), done.
[root@centos7 riscv_build]# cd riscv-gnu-toolchain
[root@centos7 riscv-gnu-toolchain]# git rm qemu
rm 'qemu'
[root@centos7 riscv-gnu-toolchain]# git submodule update --init --recursive
Submodule 'riscv-binutils' (https://github.com/riscv-collab/riscv-binutils-gdb.git) registered for path 'riscv-binutils'
Submodule 'riscv-dejagnu' (https://github.com/riscv-collab/riscv-dejagnu.git) registered for path 'riscv-dejagnu'
Submodule 'riscv-gcc' (https://github.com/riscv-collab/riscv-gcc.git) registered for path 'riscv-gcc'
Submodule 'riscv-gdb' (https://github.com/riscv-collab/riscv-binutils-gdb.git) registered for path 'riscv-gdb'
Submodule 'riscv-glibc' (git://sourceware.org/git/glibc.git) registered for path 'riscv-glibc'
Submodule 'riscv-newlib' (git://sourceware.org/git/newlib-cygwin.git) registered for path 'riscv-newlib'
Cloning into 'riscv-binutils'...