[lld] [lld][Wasm] Do not emit relocs against dead symbols (PR #129346)

[Sam Clegg via llvm-commits]

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@@ -167,6 +167,20 @@ void InputChunk::relocate(uint8_t *buf) const {
   }
 }
 
+static bool relocIsLive(const WasmRelocation &rel, ObjFile *file) {
+  return rel.Type == R_WASM_TYPE_INDEX_LEB ||
+         file->getSymbol(rel.Index)->isLive();
+}
+
+size_t InputChunk::getNumLiveRelocations() const {
+  size_t result = 0;
+  for (const WasmRelocation &rel : relocations) {
+    if (relocIsLive(rel, file))
+      result++;
+  }
+  return result;
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sbc100 wrote:

Is there a modern C++ way to write an accumulator like this?

https://github.com/llvm/llvm-project/pull/129346