build: extract LLVM distribution target handling

This extracts the LLVM distribution target handling into a support module.
Extraction will enable us to restructure the builds to support multiple
distribution configurations (e.g. developer and user) to permit us to build the
development package and the user package at once.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363440 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -1068,36 +1068,8 @@ endif()
 
 # This must be at the end of the LLVM root CMakeLists file because it must run
 # after all targets are created.
-if(LLVM_DISTRIBUTION_COMPONENTS)
-  if(LLVM_ENABLE_IDE)
-    message(FATAL_ERROR "LLVM_DISTRIBUTION_COMPONENTS cannot be specified with multi-configuration generators (i.e. Xcode or Visual Studio)")
-  endif()
-
-  add_custom_target(distribution)
-  add_custom_target(install-distribution)
-  add_custom_target(install-distribution-stripped)
-  foreach(target ${LLVM_DISTRIBUTION_COMPONENTS} ${LLVM_RUNTIME_DISTRIBUTION_COMPONENTS})
-    if(TARGET ${target})
-      add_dependencies(distribution ${target})
-    else()
-      message(SEND_ERROR "Specified distribution component '${target}' doesn't have a target")
-    endif()
-
-    if(TARGET install-${target})
-      add_dependencies(install-distribution install-${target})
-    else()
-      message(SEND_ERROR "Specified distribution component '${target}' doesn't have an install target")
-    endif()
-
-    if(TARGET install-${target}-stripped)
-      add_dependencies(install-distribution-stripped install-${target}-stripped)
-    else()
-      message(SEND_ERROR "Specified distribution component '${target}' doesn't have an install-stripped target."
-                         " Its installation target creation should be changed to use add_llvm_install_targets,"
-                         " or you should manually create the 'install-${target}-stripped' target.")
-    endif()
-  endforeach()
-endif()
+include(LLVMDistributionSupport)
+llvm_distribution_add_targets()
 
 # This allows us to deploy the Universal CRT DLLs by passing -DCMAKE_INSTALL_UCRT_LIBRARIES=ON to CMake
 if (MSVC AND CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows" AND CMAKE_INSTALL_UCRT_LIBRARIES)

cmake/modules/LLVMDistributionSupport.cmake

@@ -0,0 +1,36 @@
+
+if(LLVM_DISTRIBUTION_COMPONENTS)
+  if(LLVM_ENABLE_IDE)
+    message(FATAL_ERROR "LLVM_DISTRIBUTION_COMPONENTS cannot be specified with multi-configuration generators (i.e. Xcode or Visual Studio)")
+  endif()
+endif()
+
+function(llvm_distribution_add_targets)
+  add_custom_target(distribution)
+  add_custom_target(install-distribution)
+  add_custom_target(install-distribution-stripped)
+
+  foreach(target ${LLVM_DISTRIBUTION_COMPONENTS}
+      ${LLVM_RUNTIME_DISTRIBUTION_COMPONENTS})
+    if(TARGET ${target})
+      add_dependencies(distribution ${target})
+    else()
+      message(SEND_ERROR "Specified distribution component '${target}' doesn't have a target")
+    endif()
+
+    if(TARGET install-${target})
+      add_dependencies(install-distribution install-${target})
+    else()
+      message(SEND_ERROR "Specified distribution component '${target}' doesn't have an install target")
+    endif()
+
+    if(TARGET install-${target}-stripped)
+      add_dependencies(install-distribution-stripped install-${target}-stripped)
+    else()
+      message(SEND_ERROR
+              "Specified distribution component '${target}' doesn't have an install-stripped target."
+              " Its installation target creation should be changed to use add_llvm_install_targets,"
+              " or you should manually create the 'install-${target}-stripped' target.")
+    endif()
+  endforeach()
+endfunction()