Introducing the "linker_weak" linkage type. This will be used for Objective-C

metadata types which should be marked as "weak", but which the linker will
remove upon final linkage. For example, the "objc_msgSend_fixup_alloc" symbol is
defined like this:

       .globl l_objc_msgSend_fixup_alloc
       .weak_definition l_objc_msgSend_fixup_alloc
       .section __DATA, __objc_msgrefs, coalesced
       .align 3
l_objc_msgSend_fixup_alloc:
        .quad   _objc_msgSend_fixup
        .quad   L_OBJC_METH_VAR_NAME_1

This is different from the "linker_private" linkage type, because it can't have
the metadata defined with ".weak_definition".

llvm-svn: 107205

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/tools/llvm-nm/llvm-nm.cpp b/llvm/tools/llvm-nm/llvm-nm.cpp
index 2baf5323f4c..987ada949f2 100644
--- a/llvm/tools/llvm-nm/llvm-nm.cpp
+++ b/llvm/tools/llvm-nm/llvm-nm.cpp
@@ -89,7 +89,8 @@ static char TypeCharForSymbol(GlobalValue &GV) {
 static void DumpSymbolNameForGlobalValue(GlobalValue &GV) {
   // Private linkage and available_externally linkage don't exist in symtab.
   if (GV.hasPrivateLinkage() || GV.hasLinkerPrivateLinkage() ||
-      GV.hasAvailableExternallyLinkage()) return;
+      GV.hasLinkerWeakLinkage() || GV.hasAvailableExternallyLinkage())
+    return;
   
   const std::string SymbolAddrStr = "        "; // Not used yet...
   char TypeChar = TypeCharForSymbol(GV);