[libclang] Remove LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA

LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA causes clang-tools-extra tools
to be included in libclang, which caused a dependency cycle. The option
has been off by default for two releases now, and (based on a web search
and mailing list feedback) nobody seems to turn it on. Remove it, like
planned on https://reviews.llvm.org/D79599

Differential Revision: https://reviews.llvm.org/D97693

Author: nico

clang-tools-extra/test/CMakeLists.txt

@@ -17,7 +17,6 @@ string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} CLANG_TOOLS_DIR ${LLVM_RUN
 
 llvm_canonicalize_cmake_booleans(
   CLANG_TIDY_ENABLE_STATIC_ANALYZER
-  LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA
   )
 
 configure_lit_site_cfg(
@@ -68,10 +67,6 @@ set(CLANG_TOOLS_TEST_DEPS
   # Clang-tidy tests need clang for building modules.
   clang
 )
-if (LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA)
-  # For the clang-tidy libclang integration test.
-  set(CLANG_TOOLS_TEST_DEPS ${CLANG_TOOLS_TEST_DEPS} "c-index-test")
-endif ()
 
 # Add lit test dependencies.
 set(LLVM_UTILS_DEPS

clang-tools-extra/test/clang-tidy/infrastructure/nolint-plugin.cpp

@@ -11,7 +11,6 @@ config.clang_libs_dir = "@SHLIBDIR@"
 config.python_executable = "@Python3_EXECUTABLE@"
 config.target_triple = "@TARGET_TRIPLE@"
 config.clang_tidy_staticanalyzer = @CLANG_TIDY_ENABLE_STATIC_ANALYZER@
-config.libclang_include_clang_tools_extra = @LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA@
 
 # Support substitution of the tools and libs dirs with user parameters. This is
 # used when we can't determine the tool dir at configuration time.

clang-tools-extra/test/clang-tidy/infrastructure/nolintnextline-plugin.cpp

@@ -151,6 +151,10 @@ Build System Changes
 These are major changes to the build system that have happened since the 12.0.0
 release of Clang. Users of the build system should adjust accordingly.
 
+- The option ``LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA`` no longer exists. There were
+  two releases with that flag forced off, and no uses were added that forced it
+  on. The recommended replacement is clangd.
+
 - ...
 
 AST Matchers

clang-tools-extra/test/lit.site.cfg.py.in

@@ -9161,16 +9161,3 @@ cxindex::Logger::~Logger() {
     OS << "--------------------------------------------------\n";
   }
 }
-
-#ifdef CLANG_TOOL_EXTRA_BUILD
-// This anchor is used to force the linker to link the clang-tidy plugin.
-extern volatile int ClangTidyPluginAnchorSource;
-static int LLVM_ATTRIBUTE_UNUSED ClangTidyPluginAnchorDestination =
-    ClangTidyPluginAnchorSource;
-
-// This anchor is used to force the linker to link the clang-include-fixer
-// plugin.
-extern volatile int ClangIncludeFixerPluginAnchorSource;
-static int LLVM_ATTRIBUTE_UNUSED ClangIncludeFixerPluginAnchorDestination =
-    ClangIncludeFixerPluginAnchorSource;
-#endif

clang/docs/ReleaseNotes.rst

@@ -52,22 +52,6 @@ if (CLANG_ENABLE_ARCMT)
   list(APPEND LIBS clangARCMigrate)
 endif ()
 
-option(LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA
-  "Include code from clang-tools-extra in libclang." OFF)
-
-if (LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA)
-  if (TARGET clangTidyPlugin)
-    add_definitions(-DCLANG_TOOL_EXTRA_BUILD)
-    list(APPEND LIBS clangTidyPlugin)
-    list(APPEND LIBS clangIncludeFixerPlugin)
-    if(LLVM_ENABLE_MODULES)
-      list(APPEND LLVM_COMPILE_FLAGS "-fmodules-ignore-macro=CLANG_TOOL_EXTRA_BUILD")
-    endif()
-  else ()
-    message(FATAL_ERROR "LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA needs clang-tools-extra in LLVM_ENABLE_PROJECTS")
-  endif ()
-endif ()
-
 if (HAVE_LIBDL)
   list(APPEND LIBS ${CMAKE_DL_LIBS})
 elseif (CLANG_BUILT_STANDALONE)

clang/tools/libclang/CIndex.cpp

@@ -1,6 +1,5 @@
 import("//clang-tools-extra/clang-tidy/enable.gni")
 import("//clang/lib/StaticAnalyzer/Frontend/enable.gni")
-import("//clang/tools/libclang/include_clang_tools_extra.gni")
 import("//llvm/triples.gni")
 import("//llvm/utils/gn/build/write_cmake_config.gni")
 import("clang_tools_extra_lit_site_cfg_files.gni")
@@ -44,12 +43,6 @@ write_lit_config("lit_site_cfg") {
   } else {
     extra_values += [ "CLANG_TIDY_ENABLE_STATIC_ANALYZER=0" ]
   }
-
-  if (libclang_include_clang_tools_extra) {
-    extra_values += [ "LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA=1" ]
-  } else {
-    extra_values += [ "LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA=0" ]
-  }
 }
 
 write_lit_config("lit_unit_site_cfg") {

clang/tools/libclang/CMakeLists.txt

@@ -1,5 +1,4 @@
 import("//clang/lib/ARCMigrate/enable.gni")
-import("//clang/tools/libclang/include_clang_tools_extra.gni")
 import("//llvm/version.gni")
 
 # This build file is just enough to get check-clang to pass, it's missing
@@ -40,16 +39,6 @@ target(libclang_target_type, "libclang") {
 
   defines = []
 
-  # FIXME: Once the GN build has a way to select which bits to build,
-  # only include this dependency if clang-tools-extra is part of the build.
-  if (libclang_include_clang_tools_extra) {
-    defines += [ "CLANG_TOOL_EXTRA_BUILD" ]
-    deps += [
-      "//clang-tools-extra/clang-include-fixer/plugin",
-      "//clang-tools-extra/clang-tidy/plugin",
-    ]
-  }
-
   if (host_os == "win") {
     defines += [ "_CINDEX_LIB_" ]
   }