Add CMake option for the rewriter

Author: Sirraide

clang/CMakeLists.txt

@@ -432,11 +432,18 @@ if(NOT LLVM_STATIC_LINK_CXX_STDLIB)
   set(HAVE_CLANG_REPL_SUPPORT ON)
 endif()
 
+option(CLANG_ENABLE_OBJC_REWRITER "Build the Objective-C rewriter tool" OFF)
+
 option(CLANG_ENABLE_STATIC_ANALYZER
   "Include static analyzer in clang binary." ON)
 
 option(CLANG_ENABLE_PROTO_FUZZER "Build Clang protobuf fuzzer." OFF)
 
+if (DEFINED CLANG_ENABLE_ARCMT)
+  set(CLANG_ENABLE_OBJC_REWRITER ${CLANG_ENABLE_ARCMT})
+  message(DEPRECATION "'CLANG_ENABLE_ARCMT' is deprecated as ARCMigrate has been removed from Clang. Please use 'CLANG_ENABLE_OBJC_REWRITER' instead to enable or disable the Objective-C rewriter.")
+endif()
+
 # This option is a stop-gap, we should commit to removing this as
 # soon as possible. See discussion:
 # https://discourse.llvm.org/t/rationale-for-removing-versioned-libclang-middle-ground-to-keep-it-behind-option/

clang/test/Rewriter/lit.local.cfg

@@ -1,2 +1,3 @@
 # The Objective-C rewriters are currently grouped with ARCMT.
-config.unsupported = True
+if not config.root.clang_objc_rewriter:
+    config.unsupported = True

clang/test/lit.site.cfg.py.in

@@ -22,6 +22,7 @@ config.host_cxx = "@CMAKE_CXX_COMPILER@"
 config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
 config.have_zlib = @LLVM_ENABLE_ZLIB@
 config.have_zstd = @LLVM_ENABLE_ZSTD@
+config.clang_objc_rewriter = "@CLANG_ENABLE_OBJC_REWRITER@" == "ON"
 config.clang_default_pie_on_linux = @CLANG_DEFAULT_PIE_ON_LINUX@
 config.clang_default_cxx_stdlib = "@CLANG_DEFAULT_CXX_STDLIB@"
 config.clang_staticanalyzer = @CLANG_ENABLE_STATIC_ANALYZER@