Revert "[Preprocessor] Implement -fminimize-whitespace."

This reverts commit ae6b400.

llvm.org/PR51300

clang/docs/ClangCommandLineReference.rst

@@ -2475,16 +2475,6 @@ Turn on loop unroller
 
 Use #line in preprocessed output
 
-.. option:: -fminimize-whitespace, -fno-minimize-whitespace
-
-Ignore the whitespace from the input file when emitting preprocessor
-output. It will only contain whitespace when necessary, e.g. to keep two
-minus signs from merging into to an increment operator. Useful with the
--P option to normalize whitespace such that two files with only formatting
-changes are equal.
-
-Only valid with -E on C-like inputs and incompatible with -traditional-cpp.
-
 .. option:: -fvalidate-ast-input-files-content
 
 Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are considered valid if both contents is identical

clang/include/clang/Basic/DiagnosticDriverKinds.td

@@ -129,8 +129,6 @@ def err_drv_invalid_Xopenmp_target_with_args : Error<
   "invalid -Xopenmp-target argument: '%0', options requiring arguments are unsupported">;
 def err_drv_argument_only_allowed_with : Error<
   "invalid argument '%0' only allowed with '%1'">;
-def err_drv_minws_unsupported_input_type : Error<
-  "'-fminimize-whitespace' invalid for input of type %0">;
 def err_drv_amdgpu_ieee_without_no_honor_nans : Error<
   "invalid argument '-mno-amdgpu-ieee' only allowed with relaxed NaN handling">;
 def err_drv_argument_not_allowed_with : Error<

clang/include/clang/Driver/Options.td

@@ -1799,9 +1799,6 @@ def frewrite_map_file_EQ : Joined<["-"], "frewrite-map-file=">,
 defm use_line_directives : BoolFOption<"use-line-directives",
   PreprocessorOutputOpts<"UseLineDirectives">, DefaultFalse,
   PosFlag<SetTrue, [CC1Option], "Use #line in preprocessed output">, NegFlag<SetFalse>>;
-defm minimize_whitespace : BoolFOption<"minimize-whitespace",
-  PreprocessorOutputOpts<"MinimizeWhitespace">, DefaultFalse,
-  PosFlag<SetTrue, [CC1Option], "Minimize whitespace when emitting preprocessor output">, NegFlag<SetFalse>>;
 
 def ffreestanding : Flag<["-"], "ffreestanding">, Group<f_Group>, Flags<[CC1Option]>,
   HelpText<"Assert that the compilation takes place in a freestanding environment">,

clang/include/clang/Driver/Types.h

@@ -66,14 +66,6 @@ namespace types {
   /// isAcceptedByClang - Can clang handle this input type.
   bool isAcceptedByClang(ID Id);
 
-  /// isDerivedFromC - Is the input derived from C.
-  ///
-  /// That is, does the lexer follow the rules of
-  /// TokenConcatenation::AvoidConcat. If this is the case, the preprocessor may
-  /// add and remove whitespace between tokens. Used to determine whether the
-  /// input can be processed by -fminimize-whitespace.
-  bool isDerivedFromC(ID Id);
-
   /// isCXX - Is this a "C++" input (C++ and Obj-C++ sources and headers).
   bool isCXX(ID Id);
 

clang/include/clang/Frontend/PreprocessorOutputOptions.h

@@ -24,7 +24,6 @@ class PreprocessorOutputOptions {
   unsigned ShowIncludeDirectives : 1;  ///< Print includes, imports etc. within preprocessed output.
   unsigned RewriteIncludes : 1;    ///< Preprocess include directives only.
   unsigned RewriteImports  : 1;    ///< Include contents of transitively-imported modules.
-  unsigned MinimizeWhitespace : 1; ///< Ignore whitespace from input.
 
 public:
   PreprocessorOutputOptions() {
@@ -37,7 +36,6 @@ class PreprocessorOutputOptions {
     ShowIncludeDirectives = 0;
     RewriteIncludes = 0;
     RewriteImports = 0;
-    MinimizeWhitespace = 0;
   }
 };
 

clang/lib/Driver/ToolChains/Clang.cpp

@@ -52,9 +52,8 @@ using namespace clang;
 using namespace llvm::opt;
 
 static void CheckPreprocessingOptions(const Driver &D, const ArgList &Args) {
-  if (Arg *A = Args.getLastArg(clang::driver::options::OPT_C, options::OPT_CC,
-                               options::OPT_fminimize_whitespace,
-                               options::OPT_fno_minimize_whitespace)) {
+  if (Arg *A =
+          Args.getLastArg(clang::driver::options::OPT_C, options::OPT_CC)) {
     if (!Args.hasArg(options::OPT_E) && !Args.hasArg(options::OPT__SLASH_P) &&
         !Args.hasArg(options::OPT__SLASH_EP) && !D.CCCIsCPP()) {
       D.Diag(clang::diag::err_drv_argument_only_allowed_with)
@@ -6068,16 +6067,6 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                    options::OPT_fno_use_line_directives, false))
     CmdArgs.push_back("-fuse-line-directives");
 
-  // -fno-minimize-whitespace is default.
-  if (Args.hasFlag(options::OPT_fminimize_whitespace,
-                   options::OPT_fno_minimize_whitespace, false)) {
-    types::ID InputType = Inputs[0].getType();
-    if (!isDerivedFromC(InputType))
-      D.Diag(diag::err_drv_minws_unsupported_input_type)
-          << types::getTypeName(InputType);
-    CmdArgs.push_back("-fminimize-whitespace");
-  }
-
   // -fms-extensions=0 is default.
   if (Args.hasFlag(options::OPT_fms_extensions, options::OPT_fno_ms_extensions,
                    IsWindowsMSVC))

clang/lib/Driver/Types.cpp

@@ -147,45 +147,6 @@ bool types::isAcceptedByClang(ID Id) {
   }
 }
 
-bool types::isDerivedFromC(ID Id) {
-  switch (Id) {
-  default:
-    return false;
-
-  case TY_PP_C:
-  case TY_C:
-  case TY_CL:
-  case TY_CLCXX:
-  case TY_PP_CUDA:
-  case TY_CUDA:
-  case TY_CUDA_DEVICE:
-  case TY_PP_HIP:
-  case TY_HIP:
-  case TY_HIP_DEVICE:
-  case TY_PP_ObjC:
-  case TY_PP_ObjC_Alias:
-  case TY_ObjC:
-  case TY_PP_CXX:
-  case TY_CXX:
-  case TY_PP_ObjCXX:
-  case TY_PP_ObjCXX_Alias:
-  case TY_ObjCXX:
-  case TY_RenderScript:
-  case TY_PP_CHeader:
-  case TY_CHeader:
-  case TY_CLHeader:
-  case TY_PP_ObjCHeader:
-  case TY_ObjCHeader:
-  case TY_PP_CXXHeader:
-  case TY_CXXHeader:
-  case TY_PP_ObjCXXHeader:
-  case TY_ObjCXXHeader:
-  case TY_CXXModule:
-  case TY_PP_CXXModule:
-    return true;
-  }
-}
-
 bool types::isObjC(ID Id) {
   switch (Id) {
   default: