Summary: The GitHub repository riscv-collab/riscv-gnu-toolchain contains the GNU toolchain for RISC-V, including GCC. The repository has over 2.2k stars and 858 forks, and includes various branches and tags. The repository also includes submodules for binutils, gcc, gdb, glibc, musl, newlib, pk, qemu, and spike. The latest commit includes a merge pull request to fix a cross-build issue in newlib.