From e4fee1116af225c63935a2216d9b27453fa3897c Mon Sep 17 00:00:00 2001
From: David Nadlinger <code@klickverbot.at>
Date: Sun, 6 Oct 2013 20:15:28 +0200
Subject: [PATCH] ARM: Use -arm-enable-ehabi(-descriptors).

D exception handling does not work at all yet, but with these
flags it does for C++/Clang, at least in simple cases.
---
 driver/targetmachine.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/driver/targetmachine.cpp b/driver/targetmachine.cpp
index e6b46c1a..4be79b08 100644
--- a/driver/targetmachine.cpp
+++ b/driver/targetmachine.cpp
@@ -18,6 +18,7 @@
 #include "llvm/ADT/Triple.h"
 #include "llvm/MC/SubtargetFeature.h"
 #include "llvm/Support/Host.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Target/TargetMachine.h"
@@ -346,6 +347,19 @@ llvm::TargetMachine* createTargetMachine(
         }
     }
 
+    if (triple.getArch() == llvm::Triple::arm)
+    {
+        // On ARM, we want to use EHABI exception handling, as we don't support
+        // SJLJ EH in druntime. Unfortunately, it is still in a partly
+        // experimental state, and the -arm-enable-ehabi-descriptors command
+        // line option is not exposed via an internal API at all.
+        const char *backendArgs[3] = {
+            "ldc2", // Fake name, irrelevant.
+            "-arm-enable-ehabi",
+            "-arm-enable-ehabi-descriptors"
+        };
+        llvm::cl::ParseCommandLineOptions(3, backendArgs);
+    }
 
     llvm::TargetOptions targetOptions;
     targetOptions.NoFramePointerElim = genDebugInfo;