r282251 - [asan] Fix incorrect SEH symbol mangling on win64.

[Etienne Bergeron via cfe-commits]

Author: etienneb
Date: Fri Sep 23 09:07:47 2016
New Revision: 282251

URL: http://llvm.org/viewvc/llvm-project?rev=282251&view=rev
Log:
[asan] Fix incorrect SEH symbol mangling on win64.

Summary:
The ASAN unittests are failing (check-asan-dynamic) due to an incorrect symbol name:
```
LINK : error LNK2001: unresolved external symbol ___asan_seh_interceptor
```

On win64, the linker is not adding an extra underscore. This was correctly fixed in the same file for other uses.

After that patch, most of the unittests are passing, but some related to SEH needs to be fixed.
```
Failing Tests (4):
    AddressSanitizer-x86_64-windows-dynamic :: TestCases/Windows/dll_intercept_memchr.cc
    AddressSanitizer-x86_64-windows-dynamic :: TestCases/Windows/dll_intercept_memcpy_indirect.cc
    AddressSanitizer-x86_64-windows-dynamic :: TestCases/Windows/dll_seh.cc
    AddressSanitizer-x86_64-windows-dynamic :: TestCases/Windows/seh.cc

  Expected Passes    : 339
  Passes With Retry  : 3
  Expected Failures  : 16
  Unsupported Tests  : 152
  Unexpected Failures: 4
```

Reviewers: rnk, kcc, majnemer

Subscribers: majnemer, chrisha, cfe-commits

Differential Revision: https://reviews.llvm.org/D24841

Modified:
    cfe/trunk/lib/Driver/Tools.cpp

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=282251&r1=282250&r2=282251&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Fri Sep 23 09:07:47 2016
@@ -10235,7 +10235,10 @@ void visualstudio::Linker::ConstructJob(
         CmdArgs.push_back(TC.getCompilerRTArgString(Args, Lib));
       // Make sure the dynamic runtime thunk is not optimized out at link time
       // to ensure proper SEH handling.
-      CmdArgs.push_back(Args.MakeArgString("-include:___asan_seh_interceptor"));
+      CmdArgs.push_back(Args.MakeArgString(
+          TC.getArch() == llvm::Triple::x86
+              ? "-include:___asan_seh_interceptor"
+              : "-include:__asan_seh_interceptor"));
     } else if (DLL) {
       CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dll_thunk"));
     } else {