Disable accelerator tables when compiling with LTO.

LTO doesn't generate correct accelerator tables. This is due to the general lack
correct of debug info for LTO. Disable it when using LTO.
<rdar://problem/12401423>

llvm-svn: 167799

1 files changed, 16 insertions, 9 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 00894c45479..6b113bc1c98 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -3780,15 +3780,22 @@ void darwin::Link::AddLinkArgs(Compilation &C,
       CmdArgs.push_back("-demangle");
   }
 
-  // If we are using LTO, then automatically create a temporary file path for
-  // the linker to use, so that it's lifetime will extend past a possible
-  // dsymutil step.
-  if (Version[0] >= 116 && D.IsUsingLTO(Args) && NeedsTempPath(Inputs)) {
-    const char *TmpPath = C.getArgs().MakeArgString(
-      D.GetTemporaryPath("cc", types::getTypeTempSuffix(types::TY_Object)));
-    C.addTempFile(TmpPath);
-    CmdArgs.push_back("-object_path_lto");
-    CmdArgs.push_back(TmpPath);
+  if (Version[0] >= 116 && D.IsUsingLTO(Args)) {
+    if (NeedsTempPath(Inputs)) {
+      // If we are using LTO, then automatically create a temporary file path
+      // for the linker to use, so that it's lifetime will extend past a
+      // possible dsymutil step.
+      const char *TmpPath = C.getArgs().MakeArgString(
+        D.GetTemporaryPath("cc", types::getTypeTempSuffix(types::TY_Object)));
+      C.addTempFile(TmpPath);
+      CmdArgs.push_back("-object_path_lto");
+      CmdArgs.push_back(TmpPath);
+    }
+
+    // FIXME: Disable the creation of accelerator tables when using LTO. They
+    // don't currently work and can cause other tools to bork.
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-dwarf-accel-tables=Disable");
   }
 
   // Derived from the "link" spec.