Add --strip-all option back to llvm-strip.

[srhines]

Summary

This option appears to have been dropped as part of the refactoring in
r331663. Unfortunately, if we want to use llvm-strip as a drop-in
replacement for strip, this option should still be available.

[alexander-shaposhnikov]

LGTM, thanks

llvm/trunk/test/tools/llvm-objcopy/strip-all.test

 # RUN: cmp %t %t-should-remain-the-same
 
 # RUN: rm -f %t.a
 # RUN: llvm-ar crs %t.a %t
 # RUN: llvm-objcopy --strip-all %t.a %t.a
 # RUN: llvm-ar p %t.a > %t6
 # RUN: cmp %t2 %t6
 
+# RUN: cp %t %t7
+# RUN: llvm-strip -strip-all %t7
+# RUN: cmp %t2 %t7
+
+# RUN: cp %t %t8
+# RUN: llvm-strip --strip-all %t8
+# RUN: cmp %t2 %t8
+
 !ELF
 FileHeader:
   Class:           ELFCLASS64
   Data:            ELFDATA2LSB
   Type:            ET_REL
   Machine:         EM_X86_64
 Sections:
   - Name:            .bss

llvm/trunk/tools/llvm-objcopy/StripOpts.td

 include "llvm/Option/OptParser.td"
 
 multiclass Eq<string name> {
   def NAME: Separate<["--", "-"], name>;
   def NAME # _eq: Joined<["--", "-"], name # "=">, Alias<!cast<Separate>(NAME)>;
 }
 
 def help : Flag<["-", "--"], "help">;
 
 defm output : Eq<"o">,
               MetaVarName<"output">,
               HelpText<"Write output to <file>">;
 
+def strip_all : Flag<["-", "--"], "strip-all">,
+                HelpText<"Remove non-allocated sections other than .gnu.warning* sections">;
+
 def strip_debug : Flag<["-", "--"], "strip-debug">,
                   HelpText<"Remove debugging symbols only">;
 
 def d : Flag<["-"], "d">,
         Alias<strip_debug>;
 
 def g : Flag<["-"], "g">,
         Alias<strip_debug>;

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

CopyConfig ParseStripOptions(ArrayRef<const char *> ArgsArr) {
   Config.InputFilename = Positional[0];
   Config.OutputFilename =
       InputArgs.getLastArgValue(STRIP_output, Positional[0]);
 
   Config.StripDebug = InputArgs.hasArg(STRIP_strip_debug);
 
   Config.DiscardAll = InputArgs.hasArg(STRIP_discard_all);
   Config.StripUnneeded = InputArgs.hasArg(STRIP_strip_unneeded);
+  Config.StripAll = InputArgs.hasArg(STRIP_strip_all);
 
   if (!Config.StripDebug && !Config.StripUnneeded && !Config.DiscardAll)
     Config.StripAll = true;
 
   for (auto Arg : InputArgs.filtered(STRIP_remove_section))
     Config.ToRemove.push_back(Arg->getValue());
 
   for (auto Arg : InputArgs.filtered(STRIP_keep_symbol))