Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/lib64/cmake/llvm/LLVM-Config.cmake b/linux-x64/clang/lib64/cmake/llvm/LLVM-Config.cmake
new file mode 100644
index 0000000..10fd526
--- /dev/null
+++ b/linux-x64/clang/lib64/cmake/llvm/LLVM-Config.cmake
@@ -0,0 +1,320 @@
+function(get_system_libs return_var)
+  message(AUTHOR_WARNING "get_system_libs no longer needed")
+  set(${return_var} "" PARENT_SCOPE)
+endfunction()
+
+
+function(link_system_libs target)
+  message(AUTHOR_WARNING "link_system_libs no longer needed")
+endfunction()
+
+# is_llvm_target_library(
+#   library
+#     Name of the LLVM library to check
+#   return_var
+#     Output variable name
+#   ALL_TARGETS;INCLUDED_TARGETS;OMITTED_TARGETS
+#     ALL_TARGETS - default looks at the full list of known targets
+#     INCLUDED_TARGETS - looks only at targets being configured
+#     OMITTED_TARGETS - looks only at targets that are not being configured
+# )
+function(is_llvm_target_library library return_var)
+  cmake_parse_arguments(ARG "ALL_TARGETS;INCLUDED_TARGETS;OMITTED_TARGETS" "" "" ${ARGN})
+  # Sets variable `return_var' to ON if `library' corresponds to a
+  # LLVM supported target. To OFF if it doesn't.
+  set(${return_var} OFF PARENT_SCOPE)
+  string(TOUPPER "${library}" capitalized_lib)
+  if(ARG_INCLUDED_TARGETS)
+    string(TOUPPER "${LLVM_TARGETS_TO_BUILD}" targets)
+  elseif(ARG_OMITTED_TARGETS)
+    set(omitted_targets ${LLVM_ALL_TARGETS})
+    list(REMOVE_ITEM omitted_targets ${LLVM_TARGETS_TO_BUILD})
+    string(TOUPPER "${omitted_targets}" targets)
+  else()
+    string(TOUPPER "${LLVM_ALL_TARGETS}" targets)
+  endif()
+  foreach(t ${targets})
+    if( capitalized_lib STREQUAL t OR
+        capitalized_lib STREQUAL "${t}" OR
+        capitalized_lib STREQUAL "${t}DESC" OR
+        capitalized_lib STREQUAL "${t}CODEGEN" OR
+        capitalized_lib STREQUAL "${t}ASMPARSER" OR
+        capitalized_lib STREQUAL "${t}ASMPRINTER" OR
+        capitalized_lib STREQUAL "${t}DISASSEMBLER" OR
+        capitalized_lib STREQUAL "${t}INFO" OR
+        capitalized_lib STREQUAL "${t}UTILS" )
+      set(${return_var} ON PARENT_SCOPE)
+      break()
+    endif()
+  endforeach()
+endfunction(is_llvm_target_library)
+
+function(is_llvm_target_specifier library return_var)
+  is_llvm_target_library(${library} ${return_var} ${ARGN})
+  string(TOUPPER "${library}" capitalized_lib)
+  if(NOT ${return_var})
+    if( capitalized_lib STREQUAL "ALLTARGETSASMPARSERS" OR
+        capitalized_lib STREQUAL "ALLTARGETSDESCS" OR
+        capitalized_lib STREQUAL "ALLTARGETSDISASSEMBLERS" OR
+        capitalized_lib STREQUAL "ALLTARGETSINFOS" OR
+        capitalized_lib STREQUAL "NATIVE" OR
+        capitalized_lib STREQUAL "NATIVECODEGEN" )
+      set(${return_var} ON PARENT_SCOPE)
+    endif()
+  endif()
+endfunction()
+
+macro(llvm_config executable)
+  cmake_parse_arguments(ARG "USE_SHARED" "" "" ${ARGN})
+  set(link_components ${ARG_UNPARSED_ARGUMENTS})
+
+  if(USE_SHARED)
+    # If USE_SHARED is specified, then we link against libLLVM,
+    # but also against the component libraries below. This is
+    # done in case libLLVM does not contain all of the components
+    # the target requires.
+    #
+    # Strip LLVM_DYLIB_COMPONENTS out of link_components.
+    # To do this, we need special handling for "all", since that
+    # may imply linking to libraries that are not included in
+    # libLLVM.
+
+    if (DEFINED link_components AND DEFINED LLVM_DYLIB_COMPONENTS)
+      if("${LLVM_DYLIB_COMPONENTS}" STREQUAL "all")
+        set(link_components "")
+      else()
+        list(REMOVE_ITEM link_components ${LLVM_DYLIB_COMPONENTS})
+      endif()
+    endif()
+
+    target_link_libraries(${executable} PRIVATE LLVM)
+  endif()
+
+  explicit_llvm_config(${executable} ${link_components})
+endmacro(llvm_config)
+
+
+function(explicit_llvm_config executable)
+  set( link_components ${ARGN} )
+
+  llvm_map_components_to_libnames(LIBRARIES ${link_components})
+  get_target_property(t ${executable} TYPE)
+  if(t STREQUAL "STATIC_LIBRARY")
+    target_link_libraries(${executable} INTERFACE ${LIBRARIES})
+  elseif(t STREQUAL "EXECUTABLE" OR t STREQUAL "SHARED_LIBRARY" OR t STREQUAL "MODULE_LIBRARY")
+    target_link_libraries(${executable} PRIVATE ${LIBRARIES})
+  else()
+    # Use plain form for legacy user.
+    target_link_libraries(${executable} ${LIBRARIES})
+  endif()
+endfunction(explicit_llvm_config)
+
+
+# This is Deprecated
+function(llvm_map_components_to_libraries OUT_VAR)
+  message(AUTHOR_WARNING "Using llvm_map_components_to_libraries() is deprecated. Use llvm_map_components_to_libnames() instead")
+  explicit_map_components_to_libraries(result ${ARGN})
+  set( ${OUT_VAR} ${result} ${sys_result} PARENT_SCOPE )
+endfunction(llvm_map_components_to_libraries)
+
+# This is a variant intended for the final user:
+# Map LINK_COMPONENTS to actual libnames.
+function(llvm_map_components_to_libnames out_libs)
+  set( link_components ${ARGN} )
+  if(NOT LLVM_AVAILABLE_LIBS)
+    # Inside LLVM itself available libs are in a global property.
+    get_property(LLVM_AVAILABLE_LIBS GLOBAL PROPERTY LLVM_LIBS)
+  endif()
+  string(TOUPPER "${LLVM_AVAILABLE_LIBS}" capitalized_libs)
+
+  get_property(LLVM_TARGETS_CONFIGURED GLOBAL PROPERTY LLVM_TARGETS_CONFIGURED)
+
+  # Generally in our build system we avoid order-dependence. Unfortunately since
+  # not all targets create the same set of libraries we actually need to ensure
+  # that all build targets associated with a target are added before we can
+  # process target dependencies.
+  if(NOT LLVM_TARGETS_CONFIGURED)
+    foreach(c ${link_components})
+      is_llvm_target_specifier(${c} iltl_result ALL_TARGETS)
+      if(iltl_result)
+        message(FATAL_ERROR "Specified target library before target registration is complete.")
+      endif()
+    endforeach()
+  endif()
+
+  # Expand some keywords:
+  list(FIND LLVM_TARGETS_TO_BUILD "${LLVM_NATIVE_ARCH}" have_native_backend)
+  list(FIND link_components "engine" engine_required)
+  if( NOT engine_required EQUAL -1 )
+    list(FIND LLVM_TARGETS_WITH_JIT "${LLVM_NATIVE_ARCH}" have_jit)
+    if( NOT have_native_backend EQUAL -1 AND NOT have_jit EQUAL -1 )
+      list(APPEND link_components "jit")
+      list(APPEND link_components "native")
+    else()
+      list(APPEND link_components "interpreter")
+    endif()
+  endif()
+  list(FIND link_components "native" native_required)
+  if( NOT native_required EQUAL -1 )
+    if( NOT have_native_backend EQUAL -1 )
+      list(APPEND link_components ${LLVM_NATIVE_ARCH})
+    endif()
+  endif()
+
+  # Translate symbolic component names to real libraries:
+  foreach(c ${link_components})
+    # add codegen, asmprinter, asmparser, disassembler
+    list(FIND LLVM_TARGETS_TO_BUILD ${c} idx)
+    if( NOT idx LESS 0 )
+      if( TARGET LLVM${c}CodeGen )
+        list(APPEND expanded_components "LLVM${c}CodeGen")
+      else()
+        if( TARGET LLVM${c} )
+          list(APPEND expanded_components "LLVM${c}")
+        else()
+          message(FATAL_ERROR "Target ${c} is not in the set of libraries.")
+        endif()
+      endif()
+      if( TARGET LLVM${c}AsmParser )
+        list(APPEND expanded_components "LLVM${c}AsmParser")
+      endif()
+      if( TARGET LLVM${c}AsmPrinter )
+        list(APPEND expanded_components "LLVM${c}AsmPrinter")
+      endif()
+      if( TARGET LLVM${c}Desc )
+        list(APPEND expanded_components "LLVM${c}Desc")
+      endif()
+      if( TARGET LLVM${c}Disassembler )
+        list(APPEND expanded_components "LLVM${c}Disassembler")
+      endif()
+      if( TARGET LLVM${c}Info )
+        list(APPEND expanded_components "LLVM${c}Info")
+      endif()
+      if( TARGET LLVM${c}Utils )
+        list(APPEND expanded_components "LLVM${c}Utils")
+      endif()
+    elseif( c STREQUAL "native" )
+      # already processed
+    elseif( c STREQUAL "nativecodegen" )
+      list(APPEND expanded_components "LLVM${LLVM_NATIVE_ARCH}CodeGen")
+      if( TARGET LLVM${LLVM_NATIVE_ARCH}Desc )
+        list(APPEND expanded_components "LLVM${LLVM_NATIVE_ARCH}Desc")
+      endif()
+      if( TARGET LLVM${LLVM_NATIVE_ARCH}Info )
+        list(APPEND expanded_components "LLVM${LLVM_NATIVE_ARCH}Info")
+      endif()
+    elseif( c STREQUAL "backend" )
+      # same case as in `native'.
+    elseif( c STREQUAL "engine" )
+      # already processed
+    elseif( c STREQUAL "all" )
+      list(APPEND expanded_components ${LLVM_AVAILABLE_LIBS})
+    elseif( c STREQUAL "AllTargetsAsmPrinters" )
+      # Link all the asm printers from all the targets
+      foreach(t ${LLVM_TARGETS_TO_BUILD})
+        if( TARGET LLVM${t}AsmPrinter )
+          list(APPEND expanded_components "LLVM${t}AsmPrinter")
+        endif()
+      endforeach(t)
+    elseif( c STREQUAL "AllTargetsAsmParsers" )
+      # Link all the asm parsers from all the targets
+      foreach(t ${LLVM_TARGETS_TO_BUILD})
+        if( TARGET LLVM${t}AsmParser )
+          list(APPEND expanded_components "LLVM${t}AsmParser")
+        endif()
+      endforeach(t)
+    elseif( c STREQUAL "AllTargetsDescs" )
+      # Link all the descs from all the targets
+      foreach(t ${LLVM_TARGETS_TO_BUILD})
+        if( TARGET LLVM${t}Desc )
+          list(APPEND expanded_components "LLVM${t}Desc")
+        endif()
+      endforeach(t)
+    elseif( c STREQUAL "AllTargetsDisassemblers" )
+      # Link all the disassemblers from all the targets
+      foreach(t ${LLVM_TARGETS_TO_BUILD})
+        if( TARGET LLVM${t}Disassembler )
+          list(APPEND expanded_components "LLVM${t}Disassembler")
+        endif()
+      endforeach(t)
+    elseif( c STREQUAL "AllTargetsInfos" )
+      # Link all the infos from all the targets
+      foreach(t ${LLVM_TARGETS_TO_BUILD})
+        if( TARGET LLVM${t}Info )
+          list(APPEND expanded_components "LLVM${t}Info")
+        endif()
+      endforeach(t)
+    else( NOT idx LESS 0 )
+      # Canonize the component name:
+      string(TOUPPER "${c}" capitalized)
+      list(FIND capitalized_libs LLVM${capitalized} lib_idx)
+      if( lib_idx LESS 0 )
+        # The component is unknown. Maybe is an omitted target?
+        is_llvm_target_library(${c} iltl_result OMITTED_TARGETS)
+        if(iltl_result)
+          # A missing library to a directly referenced omitted target would be bad.
+          message(FATAL_ERROR "Library '${c}' is a direct reference to a target library for an omitted target.")
+        else()
+          # If it is not an omitted target we should assume it is a component
+          # that hasn't yet been processed by CMake. Missing components will
+          # cause errors later in the configuration, so we can safely assume
+          # that this is valid here.
+          list(APPEND expanded_components LLVM${c})
+        endif()
+      else( lib_idx LESS 0 )
+        list(GET LLVM_AVAILABLE_LIBS ${lib_idx} canonical_lib)
+        list(APPEND expanded_components ${canonical_lib})
+      endif( lib_idx LESS 0 )
+    endif( NOT idx LESS 0 )
+  endforeach(c)
+
+  set(${out_libs} ${expanded_components} PARENT_SCOPE)
+endfunction()
+
+# Perform a post-order traversal of the dependency graph.
+# This duplicates the algorithm used by llvm-config, originally
+# in tools/llvm-config/llvm-config.cpp, function ComputeLibsForComponents.
+function(expand_topologically name required_libs visited_libs)
+  list(FIND visited_libs ${name} found)
+  if( found LESS 0 )
+    list(APPEND visited_libs ${name})
+    set(visited_libs ${visited_libs} PARENT_SCOPE)
+
+    get_property(lib_deps GLOBAL PROPERTY LLVMBUILD_LIB_DEPS_${name})
+    foreach( lib_dep ${lib_deps} )
+      expand_topologically(${lib_dep} "${required_libs}" "${visited_libs}")
+      set(required_libs ${required_libs} PARENT_SCOPE)
+      set(visited_libs ${visited_libs} PARENT_SCOPE)
+    endforeach()
+
+    list(APPEND required_libs ${name})
+    set(required_libs ${required_libs} PARENT_SCOPE)
+  endif()
+endfunction()
+
+# Expand dependencies while topologically sorting the list of libraries:
+function(llvm_expand_dependencies out_libs)
+  set(expanded_components ${ARGN})
+
+  set(required_libs)
+  set(visited_libs)
+  foreach( lib ${expanded_components} )
+    expand_topologically(${lib} "${required_libs}" "${visited_libs}")
+  endforeach()
+
+  list(REVERSE required_libs)
+  set(${out_libs} ${required_libs} PARENT_SCOPE)
+endfunction()
+
+function(explicit_map_components_to_libraries out_libs)
+  llvm_map_components_to_libnames(link_libs ${ARGN})
+  llvm_expand_dependencies(expanded_components ${link_libs})
+  # Return just the libraries included in this build:
+  set(result)
+  foreach(c ${expanded_components})
+    if( TARGET ${c} )
+      set(result ${result} ${c})
+    endif()
+  endforeach(c)
+  set(${out_libs} ${result} PARENT_SCOPE)
+endfunction(explicit_map_components_to_libraries)