[llvm-objcopy] Add --weaken-symbol (-W) option

llvm-svn: 331070

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index 59b07828cbd..4dd8d36ee08 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -120,6 +120,7 @@ struct CopyConfig {
   std::vector<StringRef> AddSection;
   std::vector<StringRef> SymbolsToLocalize;
   std::vector<StringRef> SymbolsToGlobalize;
+  std::vector<StringRef> SymbolsToWeaken;
   StringMap<StringRef> SymbolsToRename;
   bool StripAll;
   bool StripAllGNU;
@@ -328,6 +329,11 @@ void HandleArgs(const CopyConfig &Config, Object &Obj, const Reader &Reader,
           is_contained(Config.SymbolsToGlobalize, Sym.Name))
         Sym.Binding = STB_GLOBAL;
 
+      if (!Config.SymbolsToWeaken.empty() &&
+          is_contained(Config.SymbolsToWeaken, Sym.Name) &&
+          Sym.Binding == STB_GLOBAL)
+        Sym.Binding = STB_WEAK;
+
       const auto I = Config.SymbolsToRename.find(Sym.Name);
       if (I != Config.SymbolsToRename.end())
         Sym.Name = I->getValue();
@@ -421,6 +427,8 @@ CopyConfig ParseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
     Config.SymbolsToLocalize.push_back(Arg->getValue());
   for (auto Arg : InputArgs.filtered(OBJCOPY_globalize_symbol))
     Config.SymbolsToGlobalize.push_back(Arg->getValue());
+  for (auto Arg : InputArgs.filtered(OBJCOPY_weaken_symbol))
+    Config.SymbolsToWeaken.push_back(Arg->getValue());
 
   return Config;
 }