[WebAssembly] Fix for discarded init functions

When a function is excluded via comdat we shouldn't add it to the
final list of init functions.

Differential Revision: https://reviews.llvm.org/D62983

llvm-svn: 362769

1 files changed, 3 insertions, 0 deletions

diff --git a/lld/wasm/Writer.cpp b/lld/wasm/Writer.cpp
index 0aa1180cb2b..43a8c8de637 100644
--- a/lld/wasm/Writer.cpp
+++ b/lld/wasm/Writer.cpp
@@ -701,6 +701,9 @@ void Writer::calculateInitFunctions() {
     const WasmLinkingData &L = File->getWasmObj()->linkingData();
     for (const WasmInitFunc &F : L.InitFunctions) {
       FunctionSymbol *Sym = File->getFunctionSymbol(F.Symbol);
+      // comdat exclusions can cause init functions be discarded.
+      if (Sym->isDiscarded())
+        continue;
       assert(Sym->isLive());
       if (*Sym->Signature != WasmSignature{{}, {}})
         error("invalid signature for init func: " + toString(*Sym));