Revert "[CMake] Include riscv32-unknown-elf runtimes in Fuchsia toolchain (#76849)"

This reverts commit 78550be since
it broke the two stage build.

Author: petrhosek

clang/cmake/caches/Fuchsia-stage2.cmake

@@ -6,7 +6,7 @@ set(LLVM_TARGETS_TO_BUILD X86;ARM;AArch64;RISCV CACHE STRING "")
 
 set(PACKAGE_VENDOR Fuchsia CACHE STRING "")
 
-set(_FUCHSIA_ENABLE_PROJECTS "bolt;clang;clang-tools-extra;libc;lld;llvm;polly")
+set(_FUCHSIA_ENABLE_PROJECTS "bolt;clang;clang-tools-extra;lld;llvm;polly")
 set(LLVM_ENABLE_RUNTIMES "compiler-rt;libcxx;libcxxabi;libunwind" CACHE STRING "")
 
 set(LLVM_ENABLE_BACKTRACES OFF CACHE BOOL "")
@@ -22,11 +22,8 @@ set(LLVM_ENABLE_TERMINFO OFF CACHE BOOL "")
 set(LLVM_ENABLE_UNWIND_TABLES OFF CACHE BOOL "")
 set(LLVM_ENABLE_Z3_SOLVER OFF CACHE BOOL "")
 set(LLVM_ENABLE_ZLIB ON CACHE BOOL "")
-set(LLVM_FORCE_BUILD_RUNTIME ON CACHE BOOL "")
 set(LLVM_INCLUDE_DOCS OFF CACHE BOOL "")
 set(LLVM_INCLUDE_EXAMPLES OFF CACHE BOOL "")
-set(LLVM_LIBC_FULL_BUILD ON CACHE BOOL "")
-set(LIBC_HDRGEN_ONLY ON CACHE BOOL "")
 set(LLVM_STATIC_LINK_CXX_STDLIB ON CACHE BOOL "")
 set(LLVM_USE_RELATIVE_PATHS_IN_FILES ON CACHE BOOL "")
 set(LLDB_ENABLE_CURSES OFF CACHE BOOL "")
@@ -300,39 +297,6 @@ if(FUCHSIA_SDK)
   set(LLVM_RUNTIME_MULTILIB_hwasan+noexcept_TARGETS "aarch64-unknown-fuchsia;riscv64-unknown-fuchsia" CACHE STRING "")
 endif()
 
-foreach(target riscv32-unknown-elf)
-  list(APPEND BUILTIN_TARGETS "${target}")
-  set(BUILTINS_${target}_CMAKE_SYSTEM_NAME Generic CACHE STRING "")
-  set(BUILTINS_${target}_CMAKE_SYSTEM_PROCESSOR RISCV CACHE STRING "")
-  set(BUILTINS_${target}_CMAKE_SYSROOT "" CACHE STRING "")
-  set(BUILTINS_${target}_CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "")
-  foreach(lang C;CXX;ASM)
-    set(BUILTINS_${target}_CMAKE_${lang}_FLAGS "--target=${target} -march=rv32imafc -mabi=ilp32f" CACHE STRING "")
-  endforeach()
-  foreach(type SHARED;MODULE;EXE)
-    set(BUILTINS_${target}_CMAKE_${type}_LINKER_FLAGS "-fuse-ld=lld" CACHE STRING "")
-  endforeach()
-  set(BUILTINS_${target}_COMPILER_RT_BAREMETAL_BUILD ON CACHE BOOL "")
-
-  list(APPEND RUNTIME_TARGETS "${target}")
-  set(RUNTIMES_${target}_CMAKE_SYSTEM_NAME Generic CACHE STRING "")
-  set(RUNTIMES_${target}_CMAKE_SYSTEM_PROCESSOR RISCV CACHE STRING "")
-  set(RUNTIMES_${target}_CMAKE_SYSROOT "" CACHE STRING "")
-  set(RUNTIMES_${target}_CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "")
-  set(RUNTIMES_${target}_CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY CACHE STRING "")
-  foreach(lang C;CXX;ASM)
-    set(RUNTIMES_${target}_CMAKE_${lang}_FLAGS "--target=${target} -march=rv32imafc -mabi=ilp32f" CACHE STRING "")
-  endforeach()
-  foreach(type SHARED;MODULE;EXE)
-    set(RUNTIMES_${target}_CMAKE_${type}_LINKER_FLAGS "-fuse-ld=lld" CACHE STRING "")
-  endforeach()
-  set(RUNTIMES_${target}_LLVM_LIBC_FULL_BUILD ON CACHE BOOL "")
-  set(RUNTIMES_${target}_LIBC_ENABLE_USE_BY_CLANG ON CACHE BOOL "")
-  set(RUNTIMES_${target}_LLVM_INCLUDE_TESTS OFF CACHE BOOL "")
-  set(RUNTIMES_${target}_LLVM_ENABLE_ASSERTIONS OFF CACHE BOOL "")
-  set(RUNTIMES_${target}_LLVM_ENABLE_RUNTIMES "libc" CACHE STRING "")
-endforeach()
-
 set(LLVM_BUILTIN_TARGETS "${BUILTIN_TARGETS}" CACHE STRING "")
 set(LLVM_RUNTIME_TARGETS "${RUNTIME_TARGETS}" CACHE STRING "")