[llvm-objcopy] Add --only-keep-debug as a noop

This option just keeps being a problem and really needs to be implemented
in some fashion. Implementing it properly requires some kind of
"replaceSectionReference" method because all the existing links need to be
maintained. The desired behavior is just for allocated sections to become
NOBITS but actually implementing that is rather tricky due to the current
design of llvm-objcopy. However converting allocated sections to NOBITS is
just an optimization and not something debuggers need. Debuggers can debug
a stripped executable and take an unstripped executable for that stripped
executable as input. Additionally allocated sections account for a very
small part of debug binaries so this optimization is quite small. I propose
that for the time being we implement this as a NOP so that people can use
llvm-objcopy where they need to, just in a sub-optimal way.

This option has already blocked a lot of people and its currently blocking me.

llvm-svn: 332396

llvm/test/tools/llvm-objcopy/basic-only-keep-debug.test

@@ -0,0 +1,20 @@
+# NOTE: This test is only intended to be valid as long as --only-keep-debug is
+#       implemented as a NOP. This test should fail when that changes and you
+#       will need to update this test.
+
+# RUN: yaml2obj %s > %t
+# RUN: llvm-objcopy %t %t2
+# RUN: llvm-objcopy --only-keep-debug %t %t3
+# RUN: cmp %t2 %t3
+
+!ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_X86_64
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    Content:         "DEADBEEF"

llvm/tools/llvm-objcopy/ObjcopyOpts.td

@@ -88,3 +88,5 @@ defm keep_symbol : Eq<"keep-symbol">,
                        HelpText<"Do not remove symbol <symbol>">;
 def K : JoinedOrSeparate<["-"], "K">,
         Alias<keep_symbol>;
+def only_keep_debug : Flag<["-", "--"], "only-keep-debug">,
+                          HelpText<"Currently ignored. Only for compaitability with GNU objcopy.">;

llvm/tools/llvm-objcopy/llvm-objcopy.cpp

@@ -160,6 +160,7 @@ struct CopyConfig {
   bool LocalizeHidden = false;
   bool Weaken = false;
   bool DiscardAll = false;
+  bool OnlyKeepDebug = false;
 };
 
 using SectionPred = std::function<bool(const SectionBase &Sec)>;
@@ -482,6 +483,7 @@ CopyConfig ParseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
   Config.LocalizeHidden = InputArgs.hasArg(OBJCOPY_localize_hidden);
   Config.Weaken = InputArgs.hasArg(OBJCOPY_weaken);
   Config.DiscardAll = InputArgs.hasArg(OBJCOPY_discard_all);
+  Config.OnlyKeepDebug = InputArgs.hasArg(OBJCOPY_only_keep_debug);
   for (auto Arg : InputArgs.filtered(OBJCOPY_localize_symbol))
     Config.SymbolsToLocalize.push_back(Arg->getValue());
   for (auto Arg : InputArgs.filtered(OBJCOPY_globalize_symbol))