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-rw-r--r--llvm/lib/MC/MCDwarf.cpp11
1 files changed, 9 insertions, 2 deletions
diff --git a/llvm/lib/MC/MCDwarf.cpp b/llvm/lib/MC/MCDwarf.cpp
index b1dced7..e7c0d37 100644
--- a/llvm/lib/MC/MCDwarf.cpp
+++ b/llvm/lib/MC/MCDwarf.cpp
@@ -447,10 +447,17 @@ static void emitOneV5FileEntry(MCStreamer *MCOS, const MCDwarfFile &DwarfFile,
StringRef(reinterpret_cast<const char *>(Cksum.data()), Cksum.size()));
}
if (HasAnySource) {
+ // From https://dwarfstd.org/issues/180201.1.html
+ // * The value is an empty null-terminated string if no source is available
+ StringRef Source = DwarfFile.Source.value_or(StringRef());
+ // * If the source is available but is an empty file then the value is a
+ // null-terminated single "\n".
+ if (DwarfFile.Source && DwarfFile.Source->empty())
+ Source = "\n";
if (LineStr)
- LineStr->emitRef(MCOS, DwarfFile.Source.value_or(StringRef()));
+ LineStr->emitRef(MCOS, Source);
else {
- MCOS->emitBytes(DwarfFile.Source.value_or(StringRef())); // Source and...
+ MCOS->emitBytes(Source); // Source and...
MCOS->emitBytes(StringRef("\0", 1)); // its null terminator.
}
}