[RISCV] Add riscv{32,64} to ALL_CRT_SUPPORTED_ARCH list

[edward-jones]

Summary

This allows crtbegin and crtend to be built, allowing RISC-V to no longer rely on implementations from libgcc.

[luismarques]

@edward-jones: what LLVM cmake options are you using to test this?

[edward-jones]

In D68393#1707675, @luismarques wrote:

@edward-jones: what LLVM cmake options are you using to test this?

Here's the flags I'm using for my build.

cmake llvm-project/compiler-rt
  -G "Ninja"
  -DCMAKE_INSTALL_PREFIX=<llvm_install>/riscv32-unknown-elf
  -DCOMPILER_RT_BUILD_BUILTINS=ON
  -DCOMPILER_RT_BUILD_SANITIZERS=OFF
  -DCOMPILER_RT_BUILD_XRAY=OFF
  -DCOMPILER_RT_BUILD_LIBFUZZER=OFF
  -DCOMPILER_RT_BUILD_PROFILE=OFF
  -DCMAKE_C_COMPILER=<llvm_install>/bin/clang
  -DCMAKE_AR=<llvm_install>/bin/llvm-ar
  -DCMAKE_NM=<llvm_install>/bin/llvm-nm
  -DCMAKE_RANLIB=<llvm_install>/bin/llvm-ranlib
  -DCMAKE_C_COMPILER_TARGET="riscv32-unknown-elf"
  -DCMAKE_ASM_COMPILER_TARGET="riscv32-unknown-elf"
  -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
  -DLLVM_CONFIG_PATH=<llvm_install>/bin/llvm-config
  -DCMAKE_C_FLAGS="-march=rv32gc -mabi=ilp32d"
  -DCMAKE_ASM_FLAGS="-march=rv32gc -mabi=ilp32d"
  -DCMAKE_EXE_LINKER_FLAGS="-nostartfiles -nostdlib"
  -DCOMPILER_RT_BAREMETAL_BUILD=ON
  -DCOMPILER_RT_OS_DIR=""

[lenary]

I have finally got the runtimes building. There's basically no documentation for the compiler-rt build system, which is very infuriating. Instead I needed to do a close reading of the cmake sources. I believe I have the correct configuration now, which I need to save somewhere (potentially so it becomes available for others).

Yes, this patch is required to ensure that you can build the compiler-rt builtins and the compiler-rt crtbegin and crtend. I am happy for it to land.

compiler-rt/cmake/config-ix.cmake

if(APPLE)
   set(ARM32 armv7 armv7s armv7k)
   set(X86_64 x86_64 x86_64h)
 endif()
 
 set(ALL_SANITIZER_COMMON_SUPPORTED_ARCH ${X86} ${X86_64} ${PPC64} ${RISCV64}
     ${ARM32} ${ARM64} ${MIPS32} ${MIPS64} ${S390X} ${SPARC} ${SPARCV9})
 set(ALL_ASAN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64}
     ${MIPS32} ${MIPS64} ${PPC64} ${S390X} ${SPARC} ${SPARCV9})
-set(ALL_CRT_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64})
+set(ALL_CRT_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${RISCV32} ${RISCV64})
 set(ALL_DFSAN_SUPPORTED_ARCH ${X86_64} ${MIPS64} ${ARM64})
 
 if(ANDROID)
   set(OS_NAME "Android")
 else()
   set(OS_NAME "${CMAKE_SYSTEM_NAME}")
 endif()