[Tutorial] Build RISCV GNU toolchain on macOS(with V extension enabled)

[ksco]

Here is a step by step guide on how to compile the RISCV-GNU-Toolchain on macOS 10.15.3. The process of trying to compile is not smooth, so I think this may be useful to others.

git clone https://github.com/riscv-collab/riscv-gnu-toolchain.git -b rvv-intrinsic
cd riscv-gnu-toolchain

macOS's file system is case insensitive by default, this will cause problems with git clone, you can create a new APFS case sensitive volume in the Disk Utility.app to solve this.

Next, edit .gitmodules file, change [submodule "riscv-glibc"] section to:

[submodule "riscv-glibc"]
        path = riscv-glibc
        url = https://github.com/riscvarchive/riscv-glibc.git
        branch = riscv-glibc-2.29

Next, run following command to download submodules:

git submodule sync
git -c http.sslVerify=false submodule update --init --recursive --force

Next, run following command to compile the whole thing:

./configure --prefix=/path/to/riscv-gnu-toolchain/build/ --with-arch=rv64gcv_zfh --with-abi=lp64d
make linux -j$(nproc)

macOS's ulimit is 256 by default, this is not enough when compiling glibc, you will get a Too many open files error, run ulimit -n 2048 .

If you encounter this problem: Undefined symbols for architecture x86_64: "_libintl_setlocale", referenced from: _main in cross-rpc_main.o, you can change riscv-gnu-toolchain/riscv-glibc/sunrpc/Makefile:L178 to$(BUILD_CC) $^ $(BUILD_LDFLAGS) -L/usr/lib -lintl -o $@

References:

• https://plctlab.github.io/opencv/Optimize_OpenCV_for_RISC-V.html
• https://github.com/riscv-collab/riscv-gnu-toolchain
• https://crossgcc.s0ufcgwqre.narkive.com/0VohJtc2/libintl-on-mac-os-x

[imkiva]

And you will need this patch haiku/buildtools@9c6e710 if building on macos-aarch64

[cheyao]

The rvv-intrinsic branch now doesn't exist, do you have any replacement?

[ksco]

The rvv-intrinsic branch now doesn't exist, do you have any replacement?

It's rvv-next now.