pcwang-thead added a comment. In D129824#3699911 <https://reviews.llvm.org/D129824#3699911>, @kito-cheng wrote:
> Just realized the problem is trying to fixed the default value of `-mabi=`, > currently `clang -target riscv32-elf -march=rv64gc > -mabi=lp64d`/`riscv32-elf-clang -march=rv64gc -mabi=lp64d` is work, and match > the behavior of GCC did, `riscv32-elf-gcc -march=rv64gc -mabi=lp64d`. > > And this patch is trying to make following two command work: `clang -target > riscv32-elf -march=rv64gc`/`riscv32-elf-clang -march=rv64gc`, specify > `-march` and `-target` but no `-mabi`. > > That is different story now, GCC isn't deduce the default abi from either > target triple or abi, so if you invoke gcc with `riscv32-elf-gcc > -march=rv64gc` or `riscv64-elf-gcc -march=rv32gc`, you will got error message > like that: `cc1: error: ABI requires '-march=rv32'` or `cc1: error: ABI > requires '-march=rv64'`. > So that's not compatible issue with GCC, that's sort of clang driver specify > issue, and I don't have strong opinion on this. > > --- > > As a GNU toolchain developer, I would say, we are not intend to change the > behavior of default value of `-mabi` or `-march`, the consensus among RISC-V > GNU toolchain maintainer is user should explicitly specify the `-march` and > `-mabi` if you are not using default `-march` and `-mabi`. @kito-cheng Thanks! We have noticed these differences between GNU and LLVM, and we have done some efforts to make both compatible. I think we can discuss here: https://github.com/riscv-non-isa/riscv-toolchain-conventions/issues/20 CHANGES SINCE LAST ACTION https://reviews.llvm.org/D129824/new/ https://reviews.llvm.org/D129824 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
