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Alex Bradbury

My total rewrite of the instructions on cross-compiling Clang/LLVM for Linux using Clang/LLVM for Linux has now landed.

If you want to cross-compile LLVM without getting angry - this is your guide! llvm.org/docs/HowToCrossCompil

llvm.orgHow to cross-compile Clang/LLVM using Clang/LLVM — LLVM 21.0.0git documentation
Mar 11, 2025, 07:33 PM·Public
15boosts·36favorites
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shac ron ₪‎

@asb @llvmweekly Nice. My main challenge has been building compiler_rt for the target.

Public
camelcdr

@asb Coincidentally I made a quick guide on how you probably don't have to and can just use systems packages yesterday.

$ # sudo apt install clang g++-riscv64-linux-gnu gemu-user $ cat hello.cpp #include <iostream> int main() { std::cout << "Hello World\n"; $ $ riscv-linux-gnu-g++ hello.cpp -o gec.out $ clang++ --target=riscve4-linux-gnu hello.cpp -o clang.out $ gemu-riscv64 -L /usr/riscv64-linux-gnu ./gcc.out Hello World $ gemu-riscv64 -L /usr/riscv64-linux-gnu ./clang.out Hello World $ $ cat rvv.cpp #include <riscv_vector.h> #include <iostream> int main() { std::cout << "vlen: * << _ riscv vlenb()*8 << \n' } $ # recommendet for RVV development today $ riscvea-linux-gnu-g++ -03 -march=rve4gcy_zba zbb_zbs rvv.cpp $ clang++ --target=riscve4-linux-gnu -03 -march=rvédgcv_zba zbb zbs rvv.cpp $ gemu-riscv64 -L /usr/riscv64-linux-gnu -cpu rvé4,zba=on,zbb=on,zbs=on,v=on,vlen=128 ./a.out vlen: 128 $ # recommendet for RVV development in the near future $ # riscv64-linux-gnu-g++-15 -march=rva23u64 rvv.cpp # not yet supported by upstream gcc $ clang++-20 --target=riscv64-linux-gnu -march=rva23u64 rvv.cpp $ gemu-riscv64 -L /usr/riscv64-linux-gnu -cpu rva23u64,vlen=128 ./a.out vlen: 128 $ # additional recommended qemu flags: $ # rvv_ta all ls=on,rvv_ma all Is=on,rvv_vl half avl=on
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