[PATCH] D44028: [WebAssembly] Add message for relocation against weak undefined symbol

[Nicholas Wilson via Phabricator via llvm-commits]

ncw created this revision.
ncw added reviewers: sbc100, ruiu.
Herald added subscribers: llvm-commits, sunfish, aheejin, jgravelle-google, dschuff, jfb.

Previously, LLD would have crashed.

These are the two error cases described for relocations in Linking.md. The operands for `call` and `get/set_global` simply can't be generated if the symbol is undefined (which is possible if it's weak).

Add test for this case.


Repository:
  rLLD LLVM Linker

https://reviews.llvm.org/D44028

Files:
  test/wasm/undefined-weak-call.test
  test/wasm/undefined-weak-getglobal.test
  wasm/InputFiles.cpp

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