DebugInfo: Add the ability to disable DWARF name tables entirely

This changes the current default behavior (from emitting pubnames by
default, to not emitting them by default) & moves to matching GCC's
behavior* with one significant difference: -gno(-gnu)-pubnames disables
pubnames even in the presence of -gsplit-dwarf (though -gsplit-dwarf
still by default enables -ggnu-pubnames). This allows users to disable
pubnames (& the new DWARF5 accelerated access tables) when they might
not be worth the size overhead.

* GCC's behavior is that -ggnu-pubnames and -gpubnames override each
other, and that -gno-gnu-pubnames and -gno-pubnames act as synonyms and
disable either kind of pubnames if they come last. (eg: -gpubnames
-gno-gnu-pubnames causes no pubnames (neither gnu or standard) to be
emitted)

llvm-svn: 340206

1 files changed, 2 insertions, 3 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index dbf6ae5dc8a..02d716abd6f 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -581,9 +581,8 @@ void CGDebugInfo::CreateCompileUnit() {
       0 /* DWOid */, CGOpts.SplitDwarfInlining, CGOpts.DebugInfoForProfiling,
       CGM.getTarget().getTriple().isNVPTX()
           ? llvm::DICompileUnit::DebugNameTableKind::None
-          : CGOpts.GnuPubnames
-                ? llvm::DICompileUnit::DebugNameTableKind::GNU
-                : llvm::DICompileUnit::DebugNameTableKind::Default);
+          : static_cast<llvm::DICompileUnit::DebugNameTableKind>(
+                CGOpts.DebugNameTable));
 }
 
 llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {