Fix compiler extension in standalone mode

[serge-sans-paille]

Summary

Use a dedicated cmake file to store the extension configured within LLVM.

This patch is related to https://reviews.llvm.org/D74602

[serge-sans-paille]

I still need to test many configurations, I'll report here.

[serge-sans-paille]

Tested without standalone build with polly linked statically and dynamically with success.

[Meinersbur]

The Windows pre-merge check seem to have failed?

llvm/cmake/modules/AddLLVM.cmake

886

Change to [GEN_CONFIG]

llvm/cmake/modules/LLVMConfig.cmake.in

115–116

[nit] unrelated whitespace change

[serge-sans-paille]

Take @Meinersbur review into account.

[Keruspe]

Works fine with 10.0.0rc2 and related patches applied, thanks!

clang/CMakeLists.txt

 
 if (LLVM_ADD_NATIVE_VISUALIZERS_TO_SOLUTION)
   add_subdirectory(utils/ClangVisualizers)
 endif()
 add_subdirectory(utils/hmaptool)
 
 if(CLANG_BUILT_STANDALONE)
   llvm_distribution_add_targets()
-  process_llvm_pass_plugins(NO_GEN)
+  process_llvm_pass_plugins()
 endif()
 
 configure_file(
   ${CLANG_SOURCE_DIR}/include/clang/Config/config.h.cmake
   ${CLANG_BINARY_DIR}/include/clang/Config/config.h)

llvm/CMakeLists.txt

if(LLVM_LIBS)
     endforeach()
   endif()
 endif()
 
 # This must be at the end of the LLVM root CMakeLists file because it must run
 # after all targets are created.
 include(LLVMDistributionSupport)
 llvm_distribution_add_targets()
-process_llvm_pass_plugins()
+process_llvm_pass_plugins(GEN_CONFIG)
 
 # 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)
   include(InstallRequiredSystemLibraries)
 endif()
 
 if (LLVM_INCLUDE_BENCHMARKS)
   # Override benchmark defaults so that when the library itself is updated these

llvm/cmake/modules/AddLLVM.cmake

if(LLVM_${name_upper}_LINK_INTO_TOOLS)
     # process_llvm_pass_plugins takes care of the actual linking, just create an
     # object library as of now
     add_llvm_library(${name} OBJECT ${ARG_UNPARSED_ARGUMENTS})
     target_compile_definitions(${name} PRIVATE LLVM_${name_upper}_LINK_INTO_TOOLS)
     set_property(TARGET ${name} APPEND PROPERTY COMPILE_DEFINITIONS LLVM_LINK_INTO_TOOLS)
     if (TARGET intrinsics_gen)
       add_dependencies(obj.${name} intrinsics_gen)
     endif()
-    message(STATUS "Registering ${name} as a pass plugin (static build: ${LLVM_${name_upper}_LINK_INTO_TOOLS})")
-    set_property(GLOBAL APPEND PROPERTY LLVM_COMPILE_EXTENSIONS ${name})
+    set_property(GLOBAL APPEND PROPERTY LLVM_STATIC_EXTENSIONS ${name})
   elseif(NOT ARG_NO_MODULE)
     add_llvm_library(${name} MODULE ${ARG_UNPARSED_ARGUMENTS})
   else()
     add_llvm_library(${name} OBJECT ${ARG_UNPARSED_ARGUMENTS})
   endif()
+  message(STATUS "Registering ${name} as a pass plugin (static build: ${LLVM_${name_upper}_LINK_INTO_TOOLS})")
 
 endfunction(add_llvm_pass_plugin)
 
 # process_llvm_pass_plugins([NO_GEN])
 #
 # Correctly set lib dependencies between plugins and tools, based on tools
 # registered with the ENABLE_PLUGINS option.
 #
-# Unless NO_GEN option is set, also generate X Macro file for extension
+# if GEN_CONFIG option is set, also generate X Macro file for extension
 # handling. It provides a HANDLE_EXTENSION(extension_namespace, ExtensionProject)
 # call for each extension allowing client code to define
 # HANDLE_EXTENSION to have a specific code be run for each extension.
 #
 function(process_llvm_pass_plugins)
   cmake_parse_arguments(ARG
-      "NO_GEN" "" ""
+      "GEN_CONFIG" "" ""
     ${ARGN})
 
-  # Add static plugins to each plugin target.
-  get_property(LLVM_EXTENSIONS GLOBAL PROPERTY LLVM_COMPILE_EXTENSIONS)
-  foreach(llvm_extension ${LLVM_EXTENSIONS})
-    string(TOUPPER ${llvm_extension} llvm_extension_upper)
-    string(TOLOWER ${llvm_extension} llvm_extension_lower)
+  if(ARG_GEN_CONFIG)
+      get_property(LLVM_STATIC_EXTENSIONS GLOBAL PROPERTY LLVM_STATIC_EXTENSIONS)
+  else()
+      include(LLVMConfigExtensions)
+  endif()
 
-    if(LLVM_${llvm_extension_upper}_LINK_INTO_TOOLS)
-      get_property(llvm_plugin_targets GLOBAL PROPERTY LLVM_PLUGIN_TARGETS)
-      foreach(llvm_plugin_target ${llvm_plugin_targets})
-        set_property(TARGET ${llvm_plugin_target} APPEND PROPERTY LINK_LIBRARIES ${llvm_extension})
-        set_property(TARGET ${llvm_plugin_target} APPEND PROPERTY INTERFACE_LINK_LIBRARIES ${llvm_extension})
-      endforeach()
-    else()
-      add_llvm_library(${llvm_extension_lower} MODULE obj.${llvm_extension_lower})
-    endif()
+  # Add static plugins to each plugin target.
+  foreach(llvm_extension ${LLVM_STATIC_EXTENSIONS})
   endforeach()
 
-  # Eventually generate the extension header.
-  if(NOT ARG_NO_GEN)
-      file(WRITE "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def.tmp" "//extension handlers\n")
-      foreach(llvm_extension ${LLVM_EXTENSIONS})
-        string(TOLOWER ${llvm_extension} llvm_extension_lower)
-
-        string(TOUPPER ${llvm_extension} llvm_extension_upper)
-        string(SUBSTRING ${llvm_extension_upper} 0 1 llvm_extension_upper_first)
-        string(SUBSTRING ${llvm_extension_lower} 1 -1 llvm_extension_lower_tail)
-        string(CONCAT llvm_extension_project ${llvm_extension_upper_first} ${llvm_extension_lower_tail})
-
-        if(LLVM_${llvm_extension_upper}_LINK_INTO_TOOLS)
-          file(APPEND "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def.tmp" "HANDLE_EXTENSION(${llvm_extension_project})\n")
-        endif()
+  # Eventually generate the extension header, and store config to a cmake file
+  # for usage in third-party configuration.
+  if(ARG_GEN_CONFIG)
+      set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
+      set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+      file(WRITE
+          "${llvm_cmake_builddir}/LLVMConfigExtensions.cmake"
+          "set(LLVM_STATIC_EXTENSIONS ${LLVM_STATIC_EXTENSIONS})")
+      install(FILES
+          ${llvm_cmake_builddir}/LLVMConfigExtensions.cmake
+          DESTINATION ${LLVM_INSTALL_PACKAGE_DIR}
+          COMPONENT cmake-exports)
 
+      file(WRITE "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def.tmp" "//extension handlers\n")
+      foreach(llvm_extension ${LLVM_STATIC_EXTENSIONS})
+        file(APPEND "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def.tmp" "HANDLE_EXTENSION(${llvm_extension})\n")
       endforeach()
       file(APPEND "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def.tmp" "#undef HANDLE_EXTENSION\n")
 
       # only replace if there's an actual change
       execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
         "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def.tmp"
         "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def")
       file(REMOVE "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def.tmp")

llvm/cmake/modules/CMakeLists.txt

install(FILES
     COMPONENT cmake-exports)
 
   install(DIRECTORY .
     DESTINATION ${LLVM_INSTALL_PACKAGE_DIR}
     COMPONENT cmake-exports
     FILES_MATCHING PATTERN *.cmake
     PATTERN .svn EXCLUDE
     PATTERN LLVMConfig.cmake EXCLUDE
+    PATTERN LLVMConfigExtensions.cmake EXCLUDE
     PATTERN LLVMConfigVersion.cmake EXCLUDE
     PATTERN LLVM-Config.cmake EXCLUDE
     PATTERN GetHostTriple.cmake EXCLUDE)
 
   if (NOT LLVM_ENABLE_IDE)
     # Add a dummy target so this can be used with LLVM_DISTRIBUTION_COMPONENTS
     add_custom_target(cmake-exports)
     add_llvm_install_targets(install-cmake-exports
                              COMPONENT cmake-exports)
   endif()
 endif()

llvm/cmake/modules/LLVMConfig.cmake.in

 # tablegen-generated headers can always depend on this target whether building
 # in-tree with LLVM or not.
 if(NOT TARGET intrinsics_gen)
   add_custom_target(intrinsics_gen)
 endif()
 
 set_property(GLOBAL PROPERTY LLVM_TARGETS_CONFIGURED On)
 include(${LLVM_CMAKE_DIR}/LLVM-Config.cmake)
+
+