[ELF] Set the symbol type for undefined atoms properly

llvm-svn: 178466

lld/lib/ReaderWriter/ELF/SectionChunks.h

@@ -748,7 +748,10 @@ void SymbolTable<ELFT>::addUndefinedAtom(Elf_Sym &sym,
   unsigned char binding = 0, type = 0;
   sym.st_value = 0;
   type = llvm::ELF::STT_NOTYPE;
-  binding = llvm::ELF::STB_WEAK;
+  if (ua->canBeNull())
+    binding = llvm::ELF::STB_WEAK;
+  else
+    binding = llvm::ELF::STB_GLOBAL;
   sym.setBindingAndType(binding, type);
 }
 

lld/test/elf/entry.objtxt

@@ -14,7 +14,7 @@
 # CHECK:  00000080 T main
 # CHECK:  00001000 A _end
 # CHECK:  00001000 A end
-# CHECK:           w _entrypoint
+# CHECK:           U _entrypoint
 
 defined-atoms:   
   - name:            .text

lld/test/elf/symbols.objtxt

@@ -24,4 +24,4 @@ CHECKSYMS:  00001000 B a
 CHECKSYMS:  00001004 A __bss_end
 CHECKSYMS:  00001004 A _end
 CHECKSYMS:  00001004 A end
-CHECKSYMS:           w _start
+CHECKSYMS:           U _start