Make the default dwarf version 3 for darwin when we can't find one
in the module. Add a FIXME with a comment about darwin's ld.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189902 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index b1a75fb..ce684ff 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -174,8 +174,12 @@
/// Return Dwarf Version by checking module flags.
static unsigned getDwarfVersionFromModule(const Module *M) {
Value *Val = M->getModuleFlag("Dwarf Version");
+ // If we don't have a value in the module go ahead and use the default in
+ // dwarf::DWARF_VERSION.
+ // FIXME: Apple ld has a problem parsing compilation units that specify a
+ // dwarf version of greater than 3.
if (!Val)
- return dwarf::DWARF_VERSION;
+ return Triple(M->getTargetTriple()).isOSDarwin() ? 3 : dwarf::DWARF_VERSION;
return cast<ConstantInt>(Val)->getZExtValue();
}