Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -847,6 +847,7 @@
 # when crosscompiling import the executable targets from a file
 if(LLVM_USE_HOST_TOOLS)
   include(CrossCompile)
+  llvm_create_cross_target(LLVM NATIVE "" Release)
 endif(LLVM_USE_HOST_TOOLS)
 if(LLVM_TARGET_IS_CROSSCOMPILE_HOST)
 # Dummy use to avoid CMake Warning: Manually-specified variables were not used
Index: cmake/modules/CrossCompile.cmake
===================================================================
--- cmake/modules/CrossCompile.cmake
+++ cmake/modules/CrossCompile.cmake
@@ -1,12 +1,15 @@
 include(LLVMExternalProjectUtils)
 
-function(llvm_create_cross_target_internal target_name toolchain buildtype)
 
-  if(NOT DEFINED LLVM_${target_name}_BUILD)
-    set(LLVM_${target_name}_BUILD "${CMAKE_BINARY_DIR}/${target_name}")
-    set(LLVM_${target_name}_BUILD ${LLVM_${target_name}_BUILD} PARENT_SCOPE)
-    message(STATUS "Setting native build dir to " ${LLVM_${target_name}_BUILD})
-  endif(NOT DEFINED LLVM_${target_name}_BUILD)
+function(llvm_create_cross_target project_name target_name toolchain buildtype)
+
+  if(NOT DEFINED ${project_name}_${target_name}_BUILD)
+    set(${project_name}_${target_name}_BUILD
+      "${CMAKE_BINARY_DIR}/${target_name}")
+    set(${project_name}_${target_name}_BUILD
+      ${${project_name}_${target_name}_BUILD} PARENT_SCOPE)
+    message(STATUS "Setting native build dir to " ${${project_name}_${target_name}_BUILD})
+  endif(NOT DEFINED ${project_name}_${target_name}_BUILD)
 
   if (EXISTS ${LLVM_MAIN_SRC_DIR}/cmake/platforms/${toolchain}.cmake)
     set(CROSS_TOOLCHAIN_FLAGS_INIT
@@ -20,6 +23,10 @@
   set(CROSS_TOOLCHAIN_FLAGS_${target_name} ${CROSS_TOOLCHAIN_FLAGS_INIT}
     CACHE STRING "Toolchain configuration for ${target_name}")
 
+  # project specific version of the flags up above
+  set(CROSS_TOOLCHAIN_FLAGS_${project_name}_${target_name} ""
+    CACHE STRING "Toolchain configuration for ${Pproject_name}_${target_name}")
+
   if (buildtype)
     set(build_type_flags "-DCMAKE_BUILD_TYPE=${buildtype}")
   endif()
@@ -31,12 +38,12 @@
     set(external_clang_dir "-DLLVM_EXTERNAL_CLANG_SOURCE_DIR=${LLVM_EXTERNAL_CLANG_SOURCE_DIR}")
   endif()
 
-  add_custom_command(OUTPUT ${LLVM_${target_name}_BUILD}
-    COMMAND ${CMAKE_COMMAND} -E make_directory ${LLVM_${target_name}_BUILD}
-    COMMENT "Creating ${LLVM_${target_name}_BUILD}...")
+  add_custom_command(OUTPUT ${${project_name}_${target_name}_BUILD}
+    COMMAND ${CMAKE_COMMAND} -E make_directory ${${project_name}_${target_name}_BUILD}
+    COMMENT "Creating ${${project_name}_${target_name}_BUILD}...")
 
-  add_custom_target(CREATE_LLVM_${target_name}
-                    DEPENDS ${LLVM_${target_name}_BUILD})
+  add_custom_target(CREATE_${project_name}_${target_name}
+    DEPENDS ${${project_name}_${target_name}_BUILD})
 
   # Escape semicolons in the targets list so that cmake doesn't expand
   # them to spaces.
@@ -50,10 +57,11 @@
   string(REPLACE ";" "$<SEMICOLON>" llvm_external_projects_arg
          "${LLVM_EXTERNAL_PROJECTS}")
 
-  add_custom_command(OUTPUT ${LLVM_${target_name}_BUILD}/CMakeCache.txt
+  add_custom_command(OUTPUT ${${project_name}_${target_name}_BUILD}/CMakeCache.txt
     COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}"
         -DCMAKE_MAKE_PROGRAM="${CMAKE_MAKE_PROGRAM}"
         ${CROSS_TOOLCHAIN_FLAGS_${target_name}} ${CMAKE_SOURCE_DIR}
+        ${CROSS_TOOLCHAIN_FLAGS_${project_name}_${target_name}}
         -DLLVM_TARGET_IS_CROSSCOMPILE_HOST=TRUE
         -DLLVM_TARGETS_TO_BUILD="${targets_to_build_arg}"
         -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="${experimental_targets_to_build_arg}"
@@ -63,19 +71,16 @@
         -DLLVM_EXTERNAL_PROJECTS="${llvm_external_projects_arg}"
         -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN="${LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN}"
         ${build_type_flags} ${linker_flag} ${external_clang_dir}
-    WORKING_DIRECTORY ${LLVM_${target_name}_BUILD}
-    DEPENDS CREATE_LLVM_${target_name}
-    COMMENT "Configuring ${target_name} LLVM...")
+        ${ARGN}
+    WORKING_DIRECTORY ${${project_name}_${target_name}_BUILD}
+    DEPENDS CREATE_${project_name}_${target_name}
+    COMMENT "Configuring ${target_name} ${project_name}...")
 
-  add_custom_target(CONFIGURE_LLVM_${target_name}
-                    DEPENDS ${LLVM_${target_name}_BUILD}/CMakeCache.txt)
+  add_custom_target(CONFIGURE_${project_name}_${target_name}
+    DEPENDS ${${project_name}_${target_name}_BUILD}/CMakeCache.txt)
 
 endfunction()
 
-function(llvm_create_cross_target target_name sysroot)
-  llvm_create_cross_target_internal(${target_name} ${sysroot} ${CMAKE_BUILD_TYPE})
-endfunction()
-
 # Sets up a native build for a tool, used e.g. for cross-compilation and
 # LLVM_OPTIMIZED_TABLEGEN. Always builds in Release.
 # - target: The target to build natively
@@ -85,20 +90,18 @@
   cmake_parse_arguments(ARG "" "" "DEPENDS" ${ARGN})
 
   if(CMAKE_CONFIGURATION_TYPES)
-    set(output_path "${LLVM_NATIVE_BUILD}/Release/bin/${target}")
+    set(output_path "${${CMAKE_PROJECT_NAME}_NATIVE_BUILD}/Release/bin/${target}")
   else()
-    set(output_path "${LLVM_NATIVE_BUILD}/bin/${target}")
+    set(output_path "${${CMAKE_PROJECT_NAME}_NATIVE_BUILD}/bin/${target}")
   endif()
 
-  llvm_ExternalProject_BuildCmd(build_cmd ${target} ${LLVM_NATIVE_BUILD}
+  llvm_ExternalProject_BuildCmd(build_cmd ${target} ${${CMAKE_PROJECT_NAME}_NATIVE_BUILD}
                                 CONFIGURATION Release)
   add_custom_command(OUTPUT "${output_path}"
                      COMMAND ${build_cmd}
-                     DEPENDS CONFIGURE_LLVM_NATIVE ${ARG_DEPENDS}
-                     WORKING_DIRECTORY "${LLVM_NATIVE_BUILD}"
+                     DEPENDS CONFIGURE_${CMAKE_PROJECT_NAME}_NATIVE ${ARG_DEPENDS}
+                     WORKING_DIRECTORY "${${CMAKE_PROJECT_NAME}_NATIVE_BUILD}"
                      COMMENT "Building native ${target}..."
                      USES_TERMINAL)
   set(${output_path_var} "${output_path}" PARENT_SCOPE)
 endfunction()
-
-llvm_create_cross_target_internal(NATIVE "" Release)