1 files changed, 4 insertions, 0 deletions
diff --git a/clang/tools/driver/cc1as_main.cpp b/clang/tools/driver/cc1as_main.cpp
index 73be56c2b4c..f01d97d1c5b 100644
--- a/clang/tools/driver/cc1as_main.cpp
+++ b/clang/tools/driver/cc1as_main.cpp
@@ -84,6 +84,7 @@ struct AssemblerInvocation {
   unsigned GenDwarfForAssembly : 1;
   std::string DwarfDebugFlags;
   std::string DebugCompilationDir;
+  std::string MainFileName;
 
   /// @}
   /// @name Frontend Options
@@ -183,6 +184,7 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
   Opts.GenDwarfForAssembly = Args->hasArg(OPT_g);
   Opts.DwarfDebugFlags = Args->getLastArgValue(OPT_dwarf_debug_flags);
   Opts.DebugCompilationDir = Args->getLastArgValue(OPT_fdebug_compilation_dir);
+  Opts.MainFileName = Args->getLastArgValue(OPT_main_file_name);
 
   // Frontend Options
   if (Args->hasArg(OPT_INPUT)) {
@@ -309,6 +311,8 @@ static bool ExecuteAssembler(AssemblerInvocation &Opts,
     Ctx.setDwarfDebugFlags(StringRef(Opts.DwarfDebugFlags));
   if (!Opts.DebugCompilationDir.empty())
     Ctx.setCompilationDir(Opts.DebugCompilationDir);
+  if (!Opts.MainFileName.empty())
+    Ctx.setMainFileName(StringRef(Opts.MainFileName));
 
   // Build up the feature string from the target feature list.
   std::string FS;