[ELF2] Add --undefined option
Add symbol specified with -u as undefined which may cause additional
object files from archives to be linked into the resulting binary.
Differential Revision: http://reviews.llvm.org/D13345
llvm-svn: 249295
diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
index cd9b760..c7dbafe 100644
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -334,8 +334,10 @@
for (auto &P : Symtab.getSymbols()) {
StringRef Name = P.first;
SymbolBody *Body = P.second->Body;
- if (Body->isStrongUndefined())
- reportUndefined<ELFT>(Symtab, *Body);
+ if (auto *U = dyn_cast<Undefined<ELFT>>(Body)) {
+ if (!U->isWeak() && !U->canKeepUndefined())
+ reportUndefined<ELFT>(Symtab, *Body);
+ }
if (auto *C = dyn_cast<DefinedCommon<ELFT>>(Body))
CommonSymbols.push_back(C);