Add TableGen-based generator for command line arguments

Upstream moved away from manually declaring `*def` and `*inc` files. These
are now auto-generated with tablegen. This patch does the same for cling,
making it easier to rebase and maintain.

CMakeLists.txt

@@ -546,6 +546,7 @@ if (TARGET clang-headers)
   list(APPEND LLVM_COMMON_DEPENDS clang-headers)
 endif()
 
+add_subdirectory(include/cling/Interpreter)
 add_subdirectory(lib)
 
 if( CLING_INCLUDE_TESTS )

include/cling/Interpreter/CMakeLists.txt

@@ -0,0 +1,5 @@
+include_directories(${LLVM_INCLUDE_DIRS})
+
+set(LLVM_TARGET_DEFINITIONS ClingOptions.td)
+tablegen(LLVM ClingOptions.inc -gen-opt-parser-defs)
+add_public_tablegen_target(ClingDriverOptions)

include/cling/Interpreter/ClingOptions.td

@@ -0,0 +1,29 @@
+//===--- ClingOptions.td - Options for cling -----------------------------------===//
+//
+// CLING - the C++ LLVM-based InterpreterG :)
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the options accepted by cling.
+//
+//===----------------------------------------------------------------------===//
+
+// Include the common option parsing interfaces.
+include "llvm/Option/OptParser.td"
+
+#ifndef NDEBUG
+def _debugFlags_EQ : Joined<["--"], "debug-only=">;
+def _debugFlags : Flag<["--"], "debug-only">;
+#endif
+def _errorout : Flag<["--"], "errorout">, HelpText<"Do not recover from input errors">;
+// Re-implement to forward to our help
+def help : Flag<["-", "--"], "help">, HelpText<"Print this help text">;
+def L : JoinedOrSeparate<["-"], "L">, HelpText<"Add directory to library search path">, MetaVarName<"<directory>">;
+def l : JoinedOrSeparate<["-"], "l">, HelpText<"Load a library before prompt">, MetaVarName<"<library>">;
+def _metastr_EQ : Joined<["--"], "metastr=">, HelpText<"Set the meta command tag, default '.'">;
+def _metastr : Separate<["--"], "metastr">, HelpText<"Set the meta command tag, default '.'">;
+def _nologo : Flag<["--"], "nologo">, HelpText<"Do not show startup-banner">;
+def noruntime : Flag<["-", "--"], "noruntime">, HelpText<"Disable runtime support (no null checking, no value printing)">;
+def _ptrcheck : Flag<["--"], "ptrcheck">, HelpText<"Enable injection of pointer validity checks">;
+def version : Flag<["-", "--"], "version">, HelpText<"Print the compiler version">;
+def v : Flag<["-"], "v">, HelpText<"Enable verbose output">;

lib/Interpreter/CMakeLists.txt

@@ -47,9 +47,9 @@ set(LLVM_LINK_COMPONENTS
 
 # clingInterpreter depends on Options.inc to be tablegen-ed
 # (target ClangDriverOptions) from in-tree builds.
-set(CLING_DEPENDS)
+set(CLING_DEPENDS ClingDriverOptions)
 if(TARGET ClangDriverOptions)
-  set(CLING_DEPENDS ClangDriverOptions)
+  set(CLING_DEPENDS "${CLING_DEPENDS};ClangDriverOptions")
 endif()
 # clangSema will make sure all of the dependencies of clingInterpreter are met.
 if(TARGET clangSema)