[CodeGen/AccelTable] Don't emit zero-CU name indexes
Summary:
If an input DICompileUnit is completely empty (e.g., the result of
running "clang -g" on an empty file), we don't bother emitting an empty
DWARF CU. When we do that, we must make sure we don't also emit a DWARF v5
name index, as DWARF specifies that each index must reference at least
one compilation unit.
Reviewers: JDevlieghere, aprantl, dblaikie
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D45435
llvm-svn: 329575
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 5cd59b4..177a094 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1468,6 +1468,10 @@
}
void DwarfDebug::emitAccelDebugNames() {
+ // Don't emit anything if we have no compilation units to index.
+ if (getUnits().empty())
+ return;
+
Asm->OutStreamer->SwitchSection(
Asm->getObjFileLowering().getDwarfDebugNamesSection());
emitDWARF5AccelTable(Asm, AccelDebugNames, *this, getUnits());