[Clang] Remove ARCMigrate (#119269)

In the discussion around #116792, @rjmccall mentioned that ARCMigrate
has been obsoleted and that we could go ahead and remove it from Clang,
so this patch does just that.

Author: Sirraide

clang/CMakeLists.txt

@@ -432,18 +432,16 @@ if(NOT LLVM_STATIC_LINK_CXX_STDLIB)
   set(HAVE_CLANG_REPL_SUPPORT ON)
 endif()
 
-option(CLANG_ENABLE_ARCMT "Build ARCMT." ON)
+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(NOT CLANG_ENABLE_STATIC_ANALYZER AND CLANG_ENABLE_ARCMT)
-  message(FATAL_ERROR "Cannot disable static analyzer while enabling ARCMT or Z3")
-endif()
-
-if(CLANG_ENABLE_ARCMT)
-  set(CLANG_ENABLE_OBJC_REWRITER ON)
+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

clang/cmake/caches/Android.cmake

@@ -2,7 +2,6 @@
 
 set(LLVM_TARGETS_TO_BUILD X86 CACHE STRING "")
 
-set(CLANG_ENABLE_ARCMT OFF CACHE BOOL "")
 set(CLANG_ENABLE_STATIC_ANALYZER OFF CACHE BOOL "")
 set(CLANG_TIDY_ENABLE_STATIC_ANALYZER OFF CACHE BOOL "")
 set(CLANG_VENDOR Android CACHE STRING "")

clang/cmake/caches/Fuchsia-stage2.cmake

@@ -44,7 +44,6 @@ set(CLANG_DEFAULT_LINKER lld CACHE STRING "")
 set(CLANG_DEFAULT_OBJCOPY llvm-objcopy CACHE STRING "")
 set(CLANG_DEFAULT_RTLIB compiler-rt CACHE STRING "")
 set(CLANG_DEFAULT_UNWINDLIB libunwind CACHE STRING "")
-set(CLANG_ENABLE_ARCMT OFF CACHE BOOL "")
 set(CLANG_ENABLE_STATIC_ANALYZER ON CACHE BOOL "")
 set(CLANG_PLUGIN_SUPPORT OFF CACHE BOOL "")
 

clang/cmake/caches/Fuchsia.cmake

@@ -84,7 +84,6 @@ set(CLANG_DEFAULT_LINKER lld CACHE STRING "")
 set(CLANG_DEFAULT_OBJCOPY llvm-objcopy CACHE STRING "")
 set(CLANG_DEFAULT_RTLIB compiler-rt CACHE STRING "")
 set(CLANG_DEFAULT_UNWINDLIB libunwind CACHE STRING "")
-set(CLANG_ENABLE_ARCMT OFF CACHE BOOL "")
 set(CLANG_ENABLE_STATIC_ANALYZER OFF CACHE BOOL "")
 set(CLANG_PLUGIN_SUPPORT OFF CACHE BOOL "")
 

clang/docs/ReleaseNotes.rst

@@ -34,6 +34,8 @@ latest release, please see the `Clang Web Site <https://clang.llvm.org>`_ or the
 Potentially Breaking Changes
 ============================
 
+- The Objective-C ARC migrator (ARCMigrate) has been removed.
+
 C/C++ Language Potentially Breaking Changes
 -------------------------------------------
 

clang/include/clang-c/Index.h

@@ -5905,66 +5905,6 @@ CINDEX_LINKAGE const char *clang_EvalResult_getAsStr(CXEvalResult E);
  * Disposes the created Eval memory.
  */
 CINDEX_LINKAGE void clang_EvalResult_dispose(CXEvalResult E);
-/**
- * @}
- */
-
-/** \defgroup CINDEX_REMAPPING Remapping functions
- *
- * @{
- */
-
-/**
- * A remapping of original source files and their translated files.
- */
-typedef void *CXRemapping;
-
-/**
- * Retrieve a remapping.
- *
- * \param path the path that contains metadata about remappings.
- *
- * \returns the requested remapping. This remapping must be freed
- * via a call to \c clang_remap_dispose(). Can return NULL if an error occurred.
- */
-CINDEX_LINKAGE CXRemapping clang_getRemappings(const char *path);
-
-/**
- * Retrieve a remapping.
- *
- * \param filePaths pointer to an array of file paths containing remapping info.
- *
- * \param numFiles number of file paths.
- *
- * \returns the requested remapping. This remapping must be freed
- * via a call to \c clang_remap_dispose(). Can return NULL if an error occurred.
- */
-CINDEX_LINKAGE
-CXRemapping clang_getRemappingsFromFileList(const char **filePaths,
-                                            unsigned numFiles);
-
-/**
- * Determine the number of remappings.
- */
-CINDEX_LINKAGE unsigned clang_remap_getNumFiles(CXRemapping);
-
-/**
- * Get the original and the associated filename from the remapping.
- *
- * \param original If non-NULL, will be set to the original filename.
- *
- * \param transformed If non-NULL, will be set to the filename that the original
- * is associated with.
- */
-CINDEX_LINKAGE void clang_remap_getFilenames(CXRemapping, unsigned index,
-                                             CXString *original,
-                                             CXString *transformed);
-
-/**
- * Dispose the remapping.
- */
-CINDEX_LINKAGE void clang_remap_dispose(CXRemapping);
-
 /**
  * @}
  */