[llvm] r198358 - Elaborate on comment for skeleton CU construction.

[Eric Christopher]

Author: echristo
Date: Thu Jan  2 15:38:18 2014
New Revision: 198358

URL: http://llvm.org/viewvc/llvm-project?rev=198358&view=rev
Log:
Elaborate on comment for skeleton CU construction.

Modified:
    llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp

Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp?rev=198358&r1=198357&r2=198358&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp Thu Jan  2 15:38:18 2014
@@ -825,7 +825,10 @@ DwarfCompileUnit *DwarfDebug::constructD
   if (useSplitDwarf()) {
     NewCU->initSection(Asm->getObjFileLowering().getDwarfInfoDWOSection(),
                        DwarfInfoDWOSectionSym);
-    // If we're splitting the dwarf then construct the skeleton CU now.
+    // If we're splitting the dwarf then construct the skeleton CU now
+    // since we'll need to be able to reference the symbols in the skeleton
+    // CU during various emission passes - in particular aranges need
+    // to reference the skeleton CU.
     NewCU->setSkeleton(constructSkeletonCU(NewCU));
   } else
     NewCU->initSection(Asm->getObjFileLowering().getDwarfInfoSection(),