Rebased PNaCl localmods in LLVM to 223109

lib/Target/X86/X86TargetObjectFile.cpp

Index: lib/Target/X86/X86TargetObjectFile.cpp
diff --git a/lib/Target/X86/X86TargetObjectFile.cpp b/lib/Target/X86/X86TargetObjectFile.cpp
index f8bcd616e111780528368429cf1a6147146d82ae..9988e67ac267851c43060c0ba73266af10b3aa4c 100644
--- a/lib/Target/X86/X86TargetObjectFile.cpp
+++ b/lib/Target/X86/X86TargetObjectFile.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "X86TargetObjectFile.h"
+#include "X86Subtarget.h"  // @LOCALMOD
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/IR/Mangler.h"
 #include "llvm/IR/Operator.h"
@@ -169,3 +170,30 @@ X86WindowsTargetObjectFile::getSectionForConstant(SectionKind Kind,
 
   return TargetLoweringObjectFile::getSectionForConstant(Kind, C);
 }
+
+// @LOCALMOD-START
+// NOTE: this was largely lifted from
+// lib/Target/ARM/ARMTargetObjectFile.cpp
+//
+// The default is .ctors/.dtors while the arm backend uses
+// .init_array/.fini_array
+//
+// Without this the linker defined symbols __fini_array_start and
+// __fini_array_end do not have useful values. c.f.:
+// http://code.google.com/p/nativeclient/issues/detail?id=805
+void TargetLoweringObjectFileNaCl::Initialize(MCContext &Ctx,
+                                              const TargetMachine &TM) {
+  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+
+  StaticCtorSection =
+    getContext().getELFSection(".init_array", ELF::SHT_INIT_ARRAY,
+                               ELF::SHF_WRITE |
+                               ELF::SHF_ALLOC,
+                               SectionKind::getDataRel());
+  StaticDtorSection =
+    getContext().getELFSection(".fini_array", ELF::SHT_FINI_ARRAY,
+                               ELF::SHF_WRITE |
+                               ELF::SHF_ALLOC,
+                               SectionKind::getDataRel());
+}
+// @LOCALMOD-END