khchen added a comment. Hi @lenary This is normal behavior in current clang implementation, `-mcpu=?` flag does not interact with any flags, it just print out the all of ProcessorModel registered in backend. https://github.com/llvm/llvm-project/blob/master/clang/tools/driver/cc1_main.cpp#L213-L215
You can reference this <https://github.com/llvm/llvm-project/blob/master/clang/tools/driver/cc1_main.cpp#L180>, so the `clang -mcpu=?` result is exactly equal to `./bin/llc -mattr=+cpuhelp`. ./bin/llc -mattr=+cpuhelp foo.ll --mtriple=riscv32 Available CPUs for this target: generic-rv32 generic-rv64 rocket-rv32 rocket-rv64 Use -mcpu or -mtune to specify the target's processor. For example, clang --target=aarch64-unknown-linux-gui -mcpu=cortex-a35 You can try `clang -mcpu=? --target=mips64el` or other target too. But you are right, this behavior is very confusing users. In D71124#2150535 <https://reviews.llvm.org/D71124#2150535>, @lenary wrote: > I've got one major issue (inline below), and I'm confused by some other > behaviour: > > When I run `clang --target=riscv64 -mcpu=?`, the list includes both > `generic-rv32` and `generic-rv64`. It doesn't show only the 64-bit cpus. This > is not changed by giving a full triple, or by additionally specifying > `-march=rv64gc`. Should it be? > > For instance, this output: > > $ clang --target=riscv64-unknown-elf -mcpu=\? -march=rv64gc > clang version 11.0.0 > Target: riscv64-unknown-unknown-elf > Thread model: posix > InstalledDir: /home/selliott/llvm-project/./build/llvm_clang/all/bin > Available CPUs for this target: > > generic-rv32 > generic-rv64 > rocket-rv32 > rocket-rv64 > sifive-e31 > sifive-u54 > > Use -mcpu or -mtune to specify the target's processor. > For example, clang --target=aarch64-unknown-linux-gui -mcpu=cortex-a35 > Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D71124/new/ https://reviews.llvm.org/D71124 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
