From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 13 Nov 2012 00:54:24 +0000 (+0000)
Subject: Disable accelerator tables when compiling with LTO.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a50059e34309c3adf76c284a68f91c4ca3574782;p=clang

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>


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@167799 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 00894c4547..6b113bc1c9 100644
--- a/lib/Driver/Tools.cpp
+++ b/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.