r268589 - Do not add uwtable attribute by default for MachO targets.

[Akira Hatanaka via cfe-commits]

Author: ahatanak
Date: Wed May  4 20:41:07 2016
New Revision: 268589

URL: http://llvm.org/viewvc/llvm-project?rev=268589&view=rev
Log:
Do not add uwtable attribute by default for MachO targets.

r217178 changed clang to add function attribute uwtable by default on
Win64, which caused the __eh_frame section to be emitted by default.
This commit restores the previous behavior for MachO targets.

rdar://problem/25282627

Added:
    cfe/trunk/test/Driver/win-macho-unwind.c
Modified:
    cfe/trunk/lib/Driver/MSVCToolChain.cpp

Modified: cfe/trunk/lib/Driver/MSVCToolChain.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/MSVCToolChain.cpp?rev=268589&r1=268588&r2=268589&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/MSVCToolChain.cpp (original)
+++ cfe/trunk/lib/Driver/MSVCToolChain.cpp Wed May  4 20:41:07 2016
@@ -71,6 +71,11 @@ bool MSVCToolChain::IsUnwindTablesDefaul
   // Emit unwind tables by default on Win64. All non-x86_32 Windows platforms
   // such as ARM and PPC actually require unwind tables, but LLVM doesn't know
   // how to generate them yet.
+
+  // Don't emit unwind tables by default for MachO targets.
+  if (getTriple().isOSBinFormatMachO())
+    return false;
+
   return getArch() == llvm::Triple::x86_64;
 }
 

Added: cfe/trunk/test/Driver/win-macho-unwind.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/win-macho-unwind.c?rev=268589&view=auto
==============================================================================
--- cfe/trunk/test/Driver/win-macho-unwind.c (added)
+++ cfe/trunk/test/Driver/win-macho-unwind.c Wed May  4 20:41:07 2016
@@ -0,0 +1,4 @@
+// RUN: %clang -target x86_64-pc-win32-macho -### -S %s -o %t.s 2>&1 | FileCheck %s
+ 
+// Do not add function attribute "uwtable" for macho targets.
+// CHECK-NOT: -munwind-tables