[Clang][KASAN][RISCV]How to Correctly Build Clang Containing KASAN for RISCV

[dong-miao]

Description

I am a beginner in clang.I want to debug the running process of LLVM KASAN for riscv64, but I used the following build configuration and ended up with an error. I want to know if there is a problem with my configuration.

And I specified to compile RISCV, why does the system still compile x86 files.

cmake -G Ninja \
    -DLLVM_ENABLE_PROJECTS="clang;compiler-rt" \
    -DCMAKE_BUILD_TYPE=Debug \
    -DCMAKE_C_COMPILER=/home/summer/riscv-llvm/build/bin/clang \
    -DCMAKE_CXX_COMPILER=/home/summer/riscv-llvm/build/bin/clang++ \
    -DLLVM_TARGETS_TO_BUILD="RISCV" \
    -DCOMPILER_RT_DEFAULT_TARGET_TRIPLE="riscv64-unknown-linux-gnu" \
    -DCMAKE_C_FLAGS=" -target riscv64-unknown-linux-gnu -B /opt/riscv/lib/gcc/riscv64-unknown-linux-gnu/14.2.0  -O0 -g"  \
    -DCMAKE_CXX_FLAGS=" -target riscv64-unknown-linux-gnu  -B /opt/riscv/lib/gcc/riscv64-unknown-linux-gnu/14.2.0  -O0 -g"  \
    -DCOMPILER_RT_BUILD_SANITIZERS=ON \
    -DCMAKE_CROSSCOMPILING=ON \
    -DCOMPILER_RT_BUILD_KASAN=ON \
    -DCMAKE_INSTALL_PREFIX=/home/summer/riscv-llvm/install \
    ../llvm

The error is:

FAILED: projects/compiler-rt/lib/asan/CMakeFiles/RTAsan_static.riscv64.dir/asan_rtl_x86_64.S.o
/home/summer/riscv-llvm/build/bin/clang -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/summer/riscv-llvm/build-rt/projects/compiler-rt/lib/asan -I/home/summer/riscv-llvm/compiler-rt/lib/asan -I/home/summer/riscv-llvm/build-rt/include -I/home/summer/riscv-llvm/llvm/include -I/home/summer/riscv-llvm/compiler-rt/lib/asan/.. -fPIC -g -fPIC -fno-builtin -fno-exceptions -fomit-frame-pointer -funwind-tables -fno-stack-protector -fno-sanitize=safe-stack -fvisibility=hidden -fno-lto -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta -O3 -gline-tables-only -Wno-gnu -Wno-variadic-macros -Wno-c99-extensions -nostdinc++ -fno-rtti -Wno-format -MD -MT projects/compiler-rt/lib/asan/CMakeFiles/RTAsan_static.riscv64.dir/asan_rtl_x86_64.S.o -MF projects/compiler-rt/lib/asan/CMakeFiles/RTAsan_static.riscv64.dir/asan_rtl_x86_64.S.o.d -o projects/compiler-rt/lib/asan/CMakeFiles/RTAsan_static.riscv64.dir/asan_rtl_x86_64.S.o -c /home/summer/riscv-llvm/compiler-rt/lib/asan/asan_rtl_x86_64.S
In file included from /home/summer/riscv-llvm/compiler-rt/lib/asan/asan_rtl_x86_64.S:1:
In file included from /home/summer/riscv-llvm/compiler-rt/lib/asan/asan_mapping.h:16:
/home/summer/riscv-llvm/compiler-rt/lib/asan/../sanitizer_common/sanitizer_platform.h:18:4: error: "This operating system is not supported"
#  error "This operating system is not supported"
   ^
1 error generated.
[1856/3589] Building RISCVGenDAGISel.inc...
ninja: build stopped: subcommand failed.

Thank you all for your help！

[dong-miao]

I am currently using the Ubuntu 22.04.