Why can't the clang in riscv32-elf-ubunt-24.04-llvm-nightly enable KASAN

[dong-miao]

Why can't the clang in riscv32-elf-ubunt-24.04-llvm-nightly enable KASAN and report an error: unsupported option '-fsanitize=kernel-address' for target 'riscv32-unknown-unknown-elf'.
However, the llvm-project/clang/lib/Driver/ToolChains/BareMetal.cpp file clearly defines that RISC-V32 can also enable KASAN.
The clang in the build-llvm-newlib/bin directory can enable KASAN without any errors.
I would like to know how to modify it so that clang in the insatll directory can also be enabled.
Thanks all for your help!

[pz9115]

I checked the define in llvm-project/clang/lib/Driver/ToolChains/BareMetal.cpp as you mention, it seems just allow it using in RISC-V64 port. You may get more detail from LLVM community.

https://github.com/llvm/llvm-project/blob/78bf682cb9033cf6a5bbc733e062c7b7d825fdaf/clang/lib/Driver/ToolChains/BareMetal.cpp#L729

[dong-miao]

I checked the define in llvm-project/clang/lib/Driver/ToolChains/BareMetal.cpp as you mention, it seems just allow it using in RISC-V64 port. You may get more detail from LLVM community.

https://github.com/llvm/llvm-project/blob/78bf682cb9033cf6a5bbc733e062c7b7d825fdaf/clang/lib/Driver/ToolChains/BareMetal.cpp#L729

Thanks for your reply. The feature I mentioned is KASAN (Kernel Address), and the specific code is Res |=SanitizerKind:: KernelAddress.

As I mentioned, KASAN can be enabled for riscv32-unknown-elf in the build-llvm-newlib/bin directory without any errors. But there will be problems in the installation directory.
I debugged clang in the installation directory and found that the code it executes is different from the code executed by clang in the build-llvm-newlib/bin directory.
If I compile clang separately and install it in a separate directory, then clang in the installation directory can also enable KASAN for riscv32-unknown-elf,which is a strange phenomenon.