Introduce an Emscripten C++ ABI.

Emscripten uses the Itanium C++ ABI for most things, except that it uses
ARM C++ ABI pointers to member functions, to avoid the overhead of aligning
functions.

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index b56b42c798..93da96f897 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -270,6 +270,11 @@ public:
     // beneficial.
     this->UserLabelPrefix = "";
     this->MaxAtomicPromoteWidth = this->MaxAtomicInlineWidth = 32;
+
+    // Emscripten uses the Itanium ABI mostly, but it uses ARM-style pointers
+    // to member functions so that it can avoid having to align function
+    // addresses.
+    this->TheCXXABI.set(TargetCXXABI::Emscripten);
   }
 };