From 18de1e150199ba46ad600cc92b6c05cfa8485373 Mon Sep 17 00:00:00 2001
From: Max Desiatov <max@desiatov.com>
Date: Sun, 10 May 2020 17:26:45 +0100
Subject: [PATCH] Driver: link only static libraries for WebAssembly

---
 lib/Driver/Driver.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 4b9428e9d3de0..dcff9559f823c 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -1466,9 +1466,14 @@ void Driver::buildOutputInfo(const ToolChain &TC, const DerivedArgList &Args,
       break;
 
     case options::OPT_emit_library:
-      OI.LinkAction = Args.hasArg(options::OPT_static) ?
-                      LinkKind::StaticLibrary :
-                      LinkKind::DynamicLibrary;
+      // WebAssembly only supports static libraries
+      if (TC.getTriple().isOSBinFormatWasm()) {
+        OI.LinkAction = LinkKind::StaticLibrary;
+      } else {
+        OI.LinkAction = Args.hasArg(options::OPT_static) ?
+                        LinkKind::StaticLibrary :
+                        LinkKind::DynamicLibrary;
+      }
       OI.CompilerOutputType = file_types::TY_Object;
       break;