[llvm-strip] Implement --keep-file-symbols

Differential revision: https://reviews.llvm.org/D57582

llvm-svn: 352878

Author: eleviant

llvm/test/tools/llvm-objcopy/ELF/keep-file-symbols.test

@@ -4,6 +4,11 @@
 # RUN: llvm-objcopy --keep-file-symbols --strip-symbol foo %t %t2
 # RUN: llvm-readobj --symbols %t2 | FileCheck %s --check-prefix=STRIP
 
+# RUN: llvm-strip --keep-file-symbols %t -o %t3
+# RUN: llvm-readobj --symbols %t3 | FileCheck %s --check-prefix=STRIPALL
+# RUN: llvm-strip --keep-file-symbols --strip-symbol foo %t -o %t4
+# RUN: llvm-readobj --symbols %t4 | FileCheck %s --check-prefix=STRIP
+
 !ELF
 FileHeader:
   Class:           ELFCLASS64

llvm/tools/llvm-objcopy/CopyConfig.cpp

@@ -479,6 +479,7 @@ DriverConfig parseStripOptions(ArrayRef<const char *> ArgsArr) {
   Config.StripUnneeded = InputArgs.hasArg(STRIP_strip_unneeded);
   Config.StripAll = InputArgs.hasArg(STRIP_strip_all);
   Config.StripAllGNU = InputArgs.hasArg(STRIP_strip_all_gnu);
+  Config.KeepFileSymbols = InputArgs.hasArg(STRIP_keep_file_symbols);
 
   for (auto Arg : InputArgs.filtered(STRIP_keep_section))
     Config.KeepSection.push_back(Arg->getValue());

llvm/tools/llvm-objcopy/StripOpts.td

@@ -59,6 +59,9 @@ defm keep_section : Eq<"keep-section", "Keep <section>">,
                     MetaVarName<"section">;
 defm keep_symbol : Eq<"keep-symbol", "Do not remove symbol <symbol>">,
                    MetaVarName<"symbol">;
+def keep_file_symbols : Flag<["-", "--"], "keep-file-symbols">,
+                        HelpText<"Do not remove file symbols">;
+
 def K : JoinedOrSeparate<["-"], "K">, Alias<keep_symbol>;
 
 def discard_locals : Flag<["-", "--"], "discard-locals">,