[lldb/DWARF] Fix hostname-stripping logic

This bit of code is trying to strip everything up to the first colon
from all debug info paths, as dwarf2 recommends this syntax for storing
the compilation host name. However, this code was too eager, and it
ended up stripping the entire compilation directory, if it did not
contain a forward slash (or a "x:\").

Normally this does not matter, as all absolute paths will contain one of
these patterns, but this does not have to be the case in case the debug
info is produced by "clang -fdebug-compilation-dir", which can end up
producing a relative compilation directory with no slashes (this is one
of the techniques for producing "relocatable" debug info).

1 files changed, 2 insertions, 0 deletions

diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
index fde6459b2c6..3ced8d7f89b 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
@@ -718,6 +718,8 @@ FileSpec DWARFUnit::GetFile(size_t file_idx) {
 // Remove the host part if present.
 static llvm::StringRef
 removeHostnameFromPathname(llvm::StringRef path_from_dwarf) {
+  if (!path_from_dwarf.contains(':'))
+    return path_from_dwarf;
   llvm::StringRef host, path;
   std::tie(host, path) = path_from_dwarf.split(':');