Revert r305164/5/7.

cc1as does not currently access the "--" version of this flag. At the
very least this needs to be fixed and proper test cases need to be
added.

Simple reproducer:
clang -Wa,--compress-debug-sections /tmp/test.cc

Result:
error: unknown argument: '--compress-debug-sections'

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@305182 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index 319d8f5846766971929e0b59c09e784094e97bc9..1132d1345f605776a075c3b3bb1a8f66181fce07 100644 (file)
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -134,6 +134,7 @@ def migrator_no_finalize_removal : Flag<["-"], "no-finalize-removal">,
 //===----------------------------------------------------------------------===//
 
 let Flags = [CC1Option, CC1AsOption, NoDriverOption] in {
+
 def debug_info_kind_EQ : Joined<["-"], "debug-info-kind=">;
 def debug_info_macro : Flag<["-"], "debug-info-macro">,
   HelpText<"Emit macro debug information">;
@@ -143,16 +144,14 @@ def fdebug_compilation_dir : Separate<["-"], "fdebug-compilation-dir">,
   HelpText<"The compilation directory to embed in the debug info.">;
 def dwarf_debug_flags : Separate<["-"], "dwarf-debug-flags">,
   HelpText<"The string to embed in the Dwarf debug flags record.">;
-def compress_debug_sections : Flag<["-"], "compress-debug-sections">,
-    HelpText<"DWARF debug sections compression">;
-def compress_debug_sections_EQ : Flag<["-"], "compress-debug-sections=">,
-    HelpText<"DWARF debug sections compression type">;
 def mno_exec_stack : Flag<["-"], "mnoexecstack">,
   HelpText<"Mark the file as not needing an executable stack">;
 def massembler_fatal_warnings : Flag<["-"], "massembler-fatal-warnings">,
   HelpText<"Make assembler warnings fatal">;
 def mrelax_relocations : Flag<["--"], "mrelax-relocations">,
     HelpText<"Use relaxable elf relocations">;
+def compress_debug_sections : Flag<["-"], "compress-debug-sections">,
+    HelpText<"Compress DWARF debug sections using zlib">;
 def msave_temp_labels : Flag<["-"], "msave-temp-labels">,
   HelpText<"Save temporary labels in the symbol table. "
            "Note this may change .s semantics and shouldn't generally be used "

diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index e47739e41ae68c46a926edd3019487e8ccb472f3..6c51976e98febed5393869538604f232968511d1 100644 (file)
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -1563,10 +1563,6 @@ def gdwarf_aranges : Flag<["-"], "gdwarf-aranges">, Group<g_flags_Group>;
 def gmodules : Flag <["-"], "gmodules">, Group<gN_Group>,
   HelpText<"Generate debug info with external references to clang modules"
            " or precompiled headers">;
-def gz : Flag<["-"], "gz">, Group<g_flags_Group>,
-    HelpText<"DWARF debug sections compression type">;
-def gz_EQ : Joined<["-"], "gz=">, Group<g_flags_Group>,
-    HelpText<"DWARF debug sections compression type">;
 def headerpad__max__install__names : Joined<["-"], "headerpad_max_install_names">;
 def help : Flag<["-", "--"], "help">, Flags<[CC1Option,CC1AsOption]>,
   HelpText<"Display available options">;

diff --git a/lib/Driver/ToolChains/Clang.cpp b/lib/Driver/ToolChains/Clang.cpp
index f805fd5cb6f5e526b87d8fe400163658268ff58b..6d3dbb5b52043541d29f0927f728baa706fccab6 100644 (file)
--- a/lib/Driver/ToolChains/Clang.cpp
+++ b/lib/Driver/ToolChains/Clang.cpp
@@ -910,37 +910,6 @@ static void RenderDebugEnablingArgs(const ArgList &Args, ArgStringList &CmdArgs,
   }
 }
 
-static void RenderDebugInfoCompressionArgs(const ArgList &Args,
-                                           ArgStringList &CmdArgs,
-                                           const Driver &D) {
-  const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ);
-  if (!A)
-    return;
-
-  if (A->getOption().getID() == options::OPT_gz) {
-    if (llvm::zlib::isAvailable())
-      CmdArgs.push_back("-compress-debug-sections");
-    else
-      D.Diag(diag::warn_debug_compression_unavailable);
-    return;
-  }
-
-  StringRef Value = A->getValue();
-  if (Value == "none") {
-    CmdArgs.push_back("-compress-debug-sections=none");
-  } else if (Value == "zlib" || Value == "zlib-gnu") {
-    if (llvm::zlib::isAvailable()) {
-      CmdArgs.push_back(
-          Args.MakeArgString("-compress-debug-sections=" + Twine(Value)));
-    } else {
-      D.Diag(diag::warn_debug_compression_unavailable);
-    }
-  } else {
-    D.Diag(diag::err_drv_unsupported_option_argument)
-        << A->getOption().getName() << Value;
-  }
-}
-
 static const char *RelocationModelName(llvm::Reloc::Model Model) {
   switch (Model) {
   case llvm::Reloc::Static:
@@ -1775,6 +1744,10 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
   // arg after parsing the '-I' arg.
   bool TakeNextArg = false;
 
+  // When using an integrated assembler, translate -Wa, and -Xassembler
+  // options.
+  bool CompressDebugSections = false;
+
   bool UseRelaxRelocations = ENABLE_X86_RELAX_RELOCATIONS;
   const char *MipsTargetFeature = nullptr;
   for (const Arg *A :
@@ -1849,11 +1822,12 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
         CmdArgs.push_back("-massembler-fatal-warnings");
       } else if (Value == "--noexecstack") {
         CmdArgs.push_back("-mnoexecstack");
-      } else if (Value.startswith("-compress-debug-sections") ||
-                 Value.startswith("--compress-debug-sections") ||
-                 Value == "-nocompress-debug-sections" ||
+      } else if (Value == "-compress-debug-sections" ||
+                 Value == "--compress-debug-sections") {
+        CompressDebugSections = true;
+      } else if (Value == "-nocompress-debug-sections" ||
                  Value == "--nocompress-debug-sections") {
-        CmdArgs.push_back(Value.data());
+        CompressDebugSections = false;
       } else if (Value == "-mrelax-relocations=yes" ||
                  Value == "--mrelax-relocations=yes") {
         UseRelaxRelocations = true;
@@ -1906,6 +1880,12 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
       }
     }
   }
+  if (CompressDebugSections) {
+    if (llvm::zlib::isAvailable())
+      CmdArgs.push_back("-compress-debug-sections");
+    else
+      D.Diag(diag::warn_debug_compression_unavailable);
+  }
   if (UseRelaxRelocations)
     CmdArgs.push_back("--mrelax-relocations");
   if (MipsTargetFeature != nullptr) {
@@ -2841,8 +2821,6 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-generate-type-units");
   }
 
-  RenderDebugInfoCompressionArgs(Args, CmdArgs, D);
-
   bool UseSeparateSections = isUseSeparateSections(Triple);
 
   if (Args.hasFlag(options::OPT_ffunction_sections,
@@ -4946,7 +4924,6 @@ void ClangAs::ConstructJob(Compilation &C, const JobAction &JA,
 
   const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
   const std::string &TripleStr = Triple.getTriple();
-  const auto &D = getToolChain().getDriver();
 
   // Don't warn about "clang -w -c foo.s"
   Args.ClaimAllArgs(options::OPT_w);
@@ -5034,8 +5011,6 @@ void ClangAs::ConstructJob(Compilation &C, const JobAction &JA,
   }
   RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, DwarfVersion,
                           llvm::DebuggerKind::Default);
-  RenderDebugInfoCompressionArgs(Args, CmdArgs, D);
-
 
   // Handle -fPIC et al -- the relocation-model affects the assembler
   // for some targets.

diff --git a/lib/Driver/ToolChains/Gnu.cpp b/lib/Driver/ToolChains/Gnu.cpp
index c9d15ea00d8e6733acf86478a234c7354b41782c..d50f8e21f62f9724b674d49692ecf6a1681e2031 100644 (file)
--- a/lib/Driver/ToolChains/Gnu.cpp
+++ b/lib/Driver/ToolChains/Gnu.cpp
@@ -650,8 +650,6 @@ void tools::gnutools::Assembler::ConstructJob(Compilation &C,
                                               const InputInfoList &Inputs,
                                               const ArgList &Args,
                                               const char *LinkingOutput) const {
-  const auto &D = getToolChain().getDriver();
-
   claimNoWarnArgs(Args);
 
   ArgStringList CmdArgs;
@@ -662,23 +660,6 @@ void tools::gnutools::Assembler::ConstructJob(Compilation &C,
   std::tie(RelocationModel, PICLevel, IsPIE) =
       ParsePICArgs(getToolChain(), Args);
 
-  if (const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ)) {
-    if (A->getOption().getID() == options::OPT_gz) {
-      CmdArgs.push_back("-compress-debug-sections");
-    } else {
-      StringRef Value = A->getValue();
-      if (Value == "none") {
-        CmdArgs.push_back("-compress-debug-sections=none");
-      } else if (Value == "zlib" || Value == "zlib-gnu") {
-        CmdArgs.push_back(
-            Args.MakeArgString("-compress-debug-sections=" + Twine(Value)));
-      } else {
-        D.Diag(diag::err_drv_unsupported_option_argument)
-            << A->getOption().getName() << Value;
-      }
-    }
-  }
-
   switch (getToolChain().getArch()) {
   default:
     break;

diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 4fd4872f385b95c6f4c2b15da65e6e28d9534004..bb635b7ad714e39db7efc4c3a708e5c0a574a03b 100644 (file)
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -739,22 +739,9 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
   Opts.CallFEntry = Args.hasArg(OPT_mfentry);
   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
-
-  if (const Arg *A = Args.getLastArg(OPT_compress_debug_sections,
-                                     OPT_compress_debug_sections_EQ)) {
-    if (A->getOption().getID() == OPT_compress_debug_sections) {
-      // TODO: be more clever about the compression type auto-detection
-      Opts.setCompressDebugSections(llvm::DebugCompressionType::GNU);
-    } else {
-      auto DCT = llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
-                     .Case("none", llvm::DebugCompressionType::None)
-                     .Case("zlib", llvm::DebugCompressionType::Z)
-                     .Case("zlib-gnu", llvm::DebugCompressionType::GNU)
-                     .Default(llvm::DebugCompressionType::None);
-      Opts.setCompressDebugSections(DCT);
-    }
-  }
-
+  // TODO: map this from -gz in the driver and give it a named value
+  if (Args.hasArg(OPT_compress_debug_sections))
+    Opts.setCompressDebugSections(llvm::DebugCompressionType::GNU);
   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
   for (auto A : Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {

diff --git a/test/Driver/compress-noias.c b/test/Driver/compress-noias.c
deleted file mode 100644 (file)
index d20cf36..0000000
--- a/test/Driver/compress-noias.c
+++ /dev/null
@@ -1,37 +0,0 @@
-// REQUIRES: zlib
-// REQUIRES: x86-registered-target
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -Wa,-compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-_COMPRESS_DEBUG_SECTIONS %s
-// CHECK-_COMPRESS_DEBUG_SECTIONS: "-compress-debug-sections"
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -Wa,--compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-__COMPRESS_DEBUG_SECTIONS %s
-// CHECK-__COMPRESS_DEBUG_SECTIONS: "--compress-debug-sections"
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -Wa,--compress-debug-sections -Wa,--nocompress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-POSNEG %s
-// CHECK-POSNEG: "--compress-debug-sections"
-// CHECK-POSNEG: "--nocompress-debug-sections"
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -Wa,-compress-debug-sections -Wa,--compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-MULTIPLE %s
-// CHECK-MULTIPLE: "-compress-debug-sections"
-// CHECK-MULTIPLE: "--compress-debug-sections"
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ %s
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ %s
-// CHECK-OPT_GZ: "-compress-debug-sections"
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz=none -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_NONE %s
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz=none -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_NONE %s
-// CHECK-OPT_GZ_EQ_NONE: "-compress-debug-sections=none"
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz=zlib -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB %s
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz=zlib -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB %s
-// CHECK-OPT_GZ_EQ_ZLIB: "-compress-debug-sections=zlib"
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz=zlib-gnu -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB_GNU %s
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz=zlib-gnu -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB_GNU %s
-// CHECK-OPT_GZ_EQ_ZLIB_GNU: "-compress-debug-sections=zlib-gnu"
-
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz=invalid -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_INVALID %s
-// RUN: %clang -### -target i686-unknown-linux-gnu -fno-integrated-as -gz=invalid -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_INVALID %s
-// CHECK-OPT_GZ_EQ_INVALID: error: unsupported argument 'invalid' to option 'gz='
-

diff --git a/test/Driver/compress.c b/test/Driver/compress.c
index a00ce91225bd94116740246a99951fcbf216361c..6cdc6b72243ec2bc894ecdb272f7ef161ecea836 100644 (file)
--- a/test/Driver/compress.c
+++ b/test/Driver/compress.c
@@ -1,36 +1,8 @@
+// RUN: %clang -### -c -integrated-as -Wa,-compress-debug-sections %s 2>&1 | FileCheck --check-prefix=COMPRESS_DEBUG %s
+// RUN: %clang -### -c -integrated-as -Wa,--compress-debug-sections %s 2>&1 | FileCheck --check-prefix=COMPRESS_DEBUG %s
 // REQUIRES: zlib
 
-// RUN: %clang -### -fintegrated-as -Wa,-compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-_COMPRESS_DEBUG_SECTIONS %s
-// CHECK-_COMPRESS_DEBUG_SECTIONS: "-compress-debug-sections"
-
-// RUN: %clang -### -fintegrated-as -Wa,--compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-__COMPRESS_DEBUG_SECTIONS %s
-// CHECK-__COMPRESS_DEBUG_SECTIONS: "--compress-debug-sections"
-
-// RUN: %clang -### -fintegrated-as -Wa,--compress-debug-sections -Wa,--nocompress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-POSNEG %s
-// CHECK-POSNEG: "--compress-debug-sections"
-// CHECK-POSNEG: "--nocompress-debug-sections"
-
-// RUN: %clang -### -fintegrated-as -Wa,-compress-debug-sections -Wa,--compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-MULTIPLE %s
-// CHECK-MULTIPLE: "-compress-debug-sections"
-// CHECK-MULTIPLE: "--compress-debug-sections"
-
-// RUN: %clang -### -fintegrated-as -gz -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ %s
-// RUN: %clang -### -fintegrated-as -gz -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ %s
-// CHECK-OPT_GZ: "-compress-debug-sections"
-
-// RUN: %clang -### -fintegrated-as -gz=none -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_NONE %s
-// RUN: %clang -### -fintegrated-as -gz=none -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_NONE %s
-// CHECK-OPT_GZ_EQ_NONE: "-compress-debug-sections=none"
-
-// RUN: %clang -### -fintegrated-as -gz=zlib -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB %s
-// RUN: %clang -### -fintegrated-as -gz=zlib -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB %s
-// CHECK-OPT_GZ_EQ_ZLIB: "-compress-debug-sections=zlib"
-
-// RUN: %clang -### -fintegrated-as -gz=zlib-gnu -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB_GNU %s
-// RUN: %clang -### -fintegrated-as -gz=zlib-gnu -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB_GNU %s
-// CHECK-OPT_GZ_EQ_ZLIB_GNU: "-compress-debug-sections=zlib-gnu"
-
-// RUN: %clang -### -fintegrated-as -gz=invalid -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_INVALID %s
-// RUN: %clang -### -fintegrated-as -gz=invalid -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_INVALID %s
-// CHECK-OPT_GZ_EQ_INVALID: error: unsupported argument 'invalid' to option 'gz='
+// COMPRESS_DEBUG: "-compress-debug-sections"
 
+// RUN: %clang -### -c -integrated-as -Wa,--compress-debug-sections -Wa,--nocompress-debug-sections %s 2>&1 | FileCheck --check-prefix=NOCOMPRESS_DEBUG %s
+// NOCOMPRESS_DEBUG-NOT: "-compress-debug-sections"

diff --git a/test/Driver/nozlibcompress.c b/test/Driver/nozlibcompress.c
index 035b115abd19a57200b0c7f0a0e435d06df1f026..9986c85d79aeabc07cba7650f3b64b3f4be06a50 100644 (file)
--- a/test/Driver/nozlibcompress.c
+++ b/test/Driver/nozlibcompress.c
@@ -1,7 +1,6 @@
+// RUN: %clang -c %s -Wa,--compress-debug-sections 2>&1 | FileCheck %s
+// RUN: %clang -c %s -Wa,--compress-debug-sections -Wa,--nocompress-debug-sections 2>&1 | FileCheck --allow-empty --check-prefix=NOWARN %s
 // REQUIRES: nozlib
 
-// RUN: %clang -fintegrated-as -gz -c %s 2>&1 | FileCheck %s -check-prefix CHECK-WARN
-// RUN: %clang -fintegrated-as -gz=none -c %s 2>&1 | FileCheck -allow-empty -check-prefix CHECK-NOWARN %s
-
-// CHECK-WARN: warning: cannot compress debug sections (zlib not installed)
-// CHECK-NOWARN-NOT: warning: cannot compress debug sections (zlib not installed)
+// CHECK: warning: cannot compress debug sections (zlib not installed)
+// NOWARN-NOT: warning: cannot compress debug sections (zlib not installed)

diff --git a/tools/driver/cc1as_main.cpp b/tools/driver/cc1as_main.cpp
index 2fc2b508ef21bf5fbff5e0bd68aba7cf04d63512..37c14f4a26e1874d6ecef94131a0169447861664 100644 (file)
--- a/tools/driver/cc1as_main.cpp
+++ b/tools/driver/cc1as_main.cpp
@@ -202,22 +202,9 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
   Opts.SaveTemporaryLabels = Args.hasArg(OPT_msave_temp_labels);
   // Any DebugInfoKind implies GenDwarfForAssembly.
   Opts.GenDwarfForAssembly = Args.hasArg(OPT_debug_info_kind_EQ);
-
-  if (const Arg *A = Args.getLastArg(OPT_compress_debug_sections,
-                                     OPT_compress_debug_sections_EQ)) {
-    if (A->getOption().getID() == OPT_compress_debug_sections) {
-      // TODO: be more clever about the compression type auto-detection
-      Opts.CompressDebugSections = llvm::DebugCompressionType::GNU;
-    } else {
-      Opts.CompressDebugSections =
-          llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
-              .Case("none", llvm::DebugCompressionType::None)
-              .Case("zlib", llvm::DebugCompressionType::Z)
-              .Case("zlib-gnu", llvm::DebugCompressionType::GNU)
-              .Default(llvm::DebugCompressionType::None);
-    }
-  }
-
+  // TODO: base this on -gz instead
+  if (Args.hasArg(OPT_compress_debug_sections))
+    Opts.CompressDebugSections = llvm::DebugCompressionType::GNU;
   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
   Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 2, Diags);
   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);