[PATCH] Allow to use -fsanitize=address for iOS simulator

[Alexander Potapenko]

This patch lets the users invoke `clang -fsanitize=address` to link binaries targeting the iOS simulator.

http://llvm-reviews.chandlerc.com/D545

Files:
  lib/Driver/ToolChains.cpp

Index: lib/Driver/ToolChains.cpp
===================================================================
--- lib/Driver/ToolChains.cpp
+++ lib/Driver/ToolChains.cpp
@@ -335,17 +335,19 @@
   // Add ASAN runtime library, if required. Dynamic libraries and bundles
   // should not be linked with the runtime library.
   if (Sanitize.needsAsanRt()) {
-    if (Args.hasArg(options::OPT_dynamiclib) ||
-        Args.hasArg(options::OPT_bundle)) {
-      // Assume the binary will provide the ASan runtime.
-    } else if (isTargetIPhoneOS()) {
+    if (isTargetIPhoneOS() && !isTargetIOSSimulator()) {
       getDriver().Diag(diag::err_drv_clang_unsupported_per_platform)
         << "-fsanitize=address";
     } else {
-      AddLinkRuntimeLib(Args, CmdArgs, "libclang_rt.asan_osx_dynamic.dylib", true);
-
-      // The ASAN runtime library requires C++.
-      AddCXXStdlibLibArgs(Args, CmdArgs);
+      if (Args.hasArg(options::OPT_dynamiclib) ||
+          Args.hasArg(options::OPT_bundle)) {
+        // Assume the binary will provide the ASan runtime.
+      } else {
+        AddLinkRuntimeLib(Args, CmdArgs,
+                          "libclang_rt.asan_osx_dynamic.dylib", true);
+        // The ASAN runtime library requires C++.
+        AddCXXStdlibLibArgs(Args, CmdArgs);
+      }
     }
   }
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