1 files changed, 6 insertions, 4 deletions
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 66be6058fd..d557f40348 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1119,10 +1119,12 @@ void DwarfDebug::endSections() {
   }
 
   // For now only turn on CU ranges if we've explicitly asked for it,
-  // we have -ffunction-sections enabled, or we've emitted a function
-  // into a unique section. At this point all sections should be finalized
-  // except for dwarf sections.
-  HasCURanges = DwarfCURanges || UsedNonDefaultText ||
+  // we have -ffunction-sections enabled, we've emitted a function
+  // into a unique section, or we're using LTO. If we're using LTO then
+  // we can't know that any particular function in the module is correlated
+  // to a particular CU and so we need to be conservative. At this point all
+  // sections should be finalized except for dwarf sections.
+  HasCURanges = DwarfCURanges || UsedNonDefaultText || (CUMap.size() > 1) ||
                 TargetMachine::getFunctionSections();
 }