Revert "[DebugInfo] Add flag to only emit referenced member functions" (#93767)

Reverts #87018

MacOS and Windows bots are broken.

Author: joker-eph

clang/include/clang/Basic/DebugOptions.def

@@ -68,8 +68,6 @@ BENIGN_DEBUGOPT(NoInlineLineTables, 1, 0) ///< Whether debug info should contain
                                           ///< inline line tables.
 
 DEBUGOPT(DebugStrictDwarf, 1, 1) ///< Whether or not to use strict DWARF info.
-DEBUGOPT(DebugOmitUnreferencedMethods, 1, 0) ///< Omit unreferenced member
-					     ///< functions in type debug info.
 
 /// Control the Assignment Tracking debug info feature.
 BENIGN_ENUM_DEBUGOPT(AssignmentTrackingMode, AssignmentTrackingOpts, 2,

clang/include/clang/Driver/Options.td

@@ -4345,10 +4345,6 @@ defm strict_dwarf : BoolOption<"g", "strict-dwarf",
           "the specified version, avoiding features from later versions.">,
   NegFlag<SetFalse>, BothFlags<[], [ClangOption, CLOption, DXCOption]>>,
   Group<g_flags_Group>;
-defm omit_unreferenced_methods : BoolGOption<"omit-unreferenced-methods",
-  CodeGenOpts<"DebugOmitUnreferencedMethods">, DefaultFalse,
-  NegFlag<SetFalse>,
-  PosFlag<SetTrue, [], [CC1Option]>, BothFlags<[], [ClangOption, CLOption, DXCOption]>>;
 defm column_info : BoolOption<"g", "column-info",
   CodeGenOpts<"DebugColumnInfo">, DefaultTrue,
   NegFlag<SetFalse, [], [ClangOption, CC1Option]>,

clang/lib/CodeGen/CGDebugInfo.cpp

@@ -2836,7 +2836,7 @@ CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
 
   // Collect data fields (including static variables and any initializers).
   CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
-  if (CXXDecl && !CGM.getCodeGenOpts().DebugOmitUnreferencedMethods)
+  if (CXXDecl)
     CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
 
   LexicalBlockStack.pop_back();

clang/lib/Driver/ToolChains/Clang.cpp

@@ -45,7 +45,6 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/BinaryFormat/Magic.h"
 #include "llvm/Config/llvm-config.h"
-#include "llvm/Frontend/Debug/Options.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Support/CodeGen.h"
@@ -4643,7 +4642,6 @@ renderDebugOptions(const ToolChain &TC, const Driver &D, const llvm::Triple &T,
   Args.addOptInFlag(CmdArgs, options::OPT_fforce_dwarf_frame,
                     options::OPT_fno_force_dwarf_frame);
 
-  bool EnableTypeUnits = false;
   if (Args.hasFlag(options::OPT_fdebug_types_section,
                    options::OPT_fno_debug_types_section, false)) {
     if (!(T.isOSBinFormatELF() || T.isOSBinFormatWasm())) {
@@ -4654,24 +4652,11 @@ renderDebugOptions(const ToolChain &TC, const Driver &D, const llvm::Triple &T,
     } else if (checkDebugInfoOption(
                    Args.getLastArg(options::OPT_fdebug_types_section), Args, D,
                    TC)) {
-      EnableTypeUnits = true;
       CmdArgs.push_back("-mllvm");
       CmdArgs.push_back("-generate-type-units");
     }
   }
 
-  if (const Arg *A =
-          Args.getLastArg(options::OPT_gomit_unreferenced_methods,
-                          options::OPT_gno_omit_unreferenced_methods))
-    (void)checkDebugInfoOption(A, Args, D, TC);
-  if (Args.hasFlag(options::OPT_gomit_unreferenced_methods,
-                   options::OPT_gno_omit_unreferenced_methods, false) &&
-      (DebugInfoKind == llvm::codegenoptions::DebugInfoConstructor ||
-       DebugInfoKind == llvm::codegenoptions::LimitedDebugInfo) &&
-      !EnableTypeUnits) {
-    CmdArgs.push_back("-gomit-unreferenced-methods");
-  }
-
   // To avoid join/split of directory+filename, the integrated assembler prefers
   // the directory form of .file on all DWARF versions. GNU as doesn't allow the
   // form before DWARF v5.

clang/test/CodeGenCXX/debug-info-incomplete-types.cpp

@@ -242,11 +242,6 @@
 // RUN: %clang -### -c %s 2>&1 | FileCheck -check-prefix=NORNGBSE %s
 // RUN: %clang -### -c -fdebug-ranges-base-address -fno-debug-ranges-base-address %s 2>&1 | FileCheck -check-prefix=NORNGBSE %s
 //
-// RUN: %clang -### -c -gomit-unreferenced-methods %s 2>&1 | FileCheck -check-prefix=INCTYPES %s
-// RUN: %clang -### -c %s 2>&1 | FileCheck -check-prefix=NOINCTYPES %s
-// RUN: %clang -### -c -gomit-unreferenced-methods -fdebug-types-section %s 2>&1 | FileCheck -check-prefix=NOINCTYPES %s
-// RUN: %clang -### -c -gomit-unreferenced-methods -fstandalone-debug %s 2>&1 | FileCheck -check-prefix=NOINCTYPES %s
-//
 // RUN: %clang -### -c -glldb %s 2>&1 | FileCheck -check-prefix=NOPUB %s
 // RUN: %clang -### -c -glldb -gno-pubnames %s 2>&1 | FileCheck -check-prefix=NOPUB %s
 //
@@ -386,9 +381,6 @@
 // RNGBSE: -fdebug-ranges-base-address
 // NORNGBSE-NOT: -fdebug-ranges-base-address
 //
-// INCTYPES: -gomit-unreferenced-methods
-// NOINCTYPES-NOT: -gomit-unreferenced-methods
-//
 // GARANGE-DAG: -generate-arange-section
 //
 // FDTS: "-mllvm" "-generate-type-units"