It may not be an option to skip .debug_line if there are file reference in already emitted debug info. So, for now, emit dummy line table entry to make older linker and assemblers happy. This is not a new behavior, original AsmPrinter emitted similar line table entries.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120760 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp
index 0daf295..5fe73e2 100644
--- a/lib/MC/MCDwarf.cpp
+++ b/lib/MC/MCDwarf.cpp
@@ -241,7 +241,8 @@
void MCDwarfFileTable::Emit(MCStreamer *MCOS,
const MCSection *DwarfLineSection,
MCSectionData *DLS,
- int PointerSize) {
+ int PointerSize,
+ const MCSection *TextSection) {
// Switch to the section where the table will be emitted into.
MCOS->SwitchSection(DwarfLineSection);
@@ -339,6 +340,23 @@
delete Line;
}
+ if (TextSection && MCLineSectionOrder.begin() == MCLineSectionOrder.end()) {
+ // Emit dummy entry if line table is empty.
+
+ MCOS->SwitchSection(TextSection);
+ MCSymbol *SectionEnd = MCOS->getContext().CreateTempSymbol();
+ // Set the value of the symbol, as we are at the end of the section.
+ MCOS->EmitLabel(SectionEnd);
+
+ // Switch back the the dwarf line section.
+ MCOS->SwitchSection(DwarfLineSection);
+
+ // emit the sequence to set the address
+ EmitDwarfSetAddress(MCOS, SectionEnd, PointerSize);
+ // emit the sequence for the LineDelta (from 1) and a zero address delta.
+ MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0);
+ }
+
// This is the end of the section, so set the value of the symbol at the end
// of this section (that was used in a previous expression).
MCOS->EmitLabel(LineEndSym);