Add clang patches corresponding to r278788.

1 files changed, 67 insertions, 0 deletions

diff --git a/contrib/llvm/patches/patch-r278788-clang-r201130-pch-miscompilation.diff b/contrib/llvm/patches/patch-r278788-clang-r201130-pch-miscompilation.diff
new file mode 100644
index 0000000..33d8db3
--- /dev/null
+++ b/contrib/llvm/patches/patch-r278788-clang-r201130-pch-miscompilation.diff
@@ -0,0 +1,67 @@
+Pull in r201130 from upstream clang trunk (by Ted Kremenek):
+
+  Fix PCH deserialization bug with local static symbols being treated
+  as local extern.
+
+  This triggered a miscompilation of code using Boost's
+  function_template.hpp when it was included inside a PCH file.  A
+  local static within that header would be treated as local extern,
+  resulting in the wrong mangling.  This only occurred during PCH
+  deserialization.
+
+  Fixes <rdar://problem/15975816> and <rdar://problem/15926311>.
+
+This fixes a crash in audio/murmur, which is using both PCH and Boost.
+
+Introduced here: http://svnweb.freebsd.org/changeset/base/278788
+
+Index: tools/clang/lib/Serialization/ASTReaderDecl.cpp
+===================================================================
+--- tools/clang/lib/Serialization/ASTReaderDecl.cpp
++++ tools/clang/lib/Serialization/ASTReaderDecl.cpp
+@@ -971,7 +971,7 @@ ASTDeclReader::RedeclarableResult ASTDeclReader::V
+   VD->setCachedLinkage(VarLinkage);
+ 
+   // Reconstruct the one piece of the IdentifierNamespace that we need.
+-  if (VarLinkage != NoLinkage &&
++  if (VD->getStorageClass() == SC_Extern && VarLinkage != NoLinkage &&
+       VD->getLexicalDeclContext()->isFunctionOrMethod())
+     VD->setLocalExternDecl();
+ 
+Index: tools/clang/test/PCH/local_static.cpp
+===================================================================
+--- tools/clang/test/PCH/local_static.cpp
++++ tools/clang/test/PCH/local_static.cpp
+@@ -0,0 +1,20 @@
++// Test this without PCH.
++// RUN: %clang_cc1 -triple x86_64-apple-macosx10.9.0 -include %S/local_static.h -fsyntax-only %s -emit-llvm -o %t.no_pch.ll %s
++// RUN: FileCheck --input-file %t.no_pch.ll %s
++
++// Test with PCH.
++// RUN: %clang_cc1 -triple x86_64-apple-macosx10.9.0 -x c++-header -emit-pch -o %t.pch %S/local_static.h
++// RUN: %clang_cc1 -triple x86_64-apple-macosx10.9.0 -include-pch %t.pch -emit-llvm -o %t.pch.ll %s
++// RUN: FileCheck --input-file %t.pch.ll %s
++
++void test(Bar &b) {
++  b.f<int>();
++  static int s;
++}
++
++// Check if the mangling of static and local extern variables
++// are correct and preserved by PCH.
++
++// CHECK: @_ZZ4testR3BarE1s = internal global i32 0, align 4
++// CHECK: @_ZZN3Bar1fIiEEvvE1y = linkonce_odr constant i32 0, align 4
++
+Index: tools/clang/test/PCH/local_static.h
+===================================================================
+--- tools/clang/test/PCH/local_static.h
++++ tools/clang/test/PCH/local_static.h
+@@ -0,0 +1,7 @@
++class Bar {
++public:
++  template<typename T>
++  void f() {
++    static const T y = 0;
++  }
++};