diff -wpruN '--exclude=*.orig' a~/lib/Driver/ToolChains/Solaris.cpp a/lib/Driver/ToolChains/Solaris.cpp
--- a~/tools/clang/lib/Driver/ToolChains/Solaris.cpp	1970-01-01 00:00:00
+++ a/tools/clang/lib/Driver/ToolChains/Solaris.cpp	1970-01-01 00:00:00
@@ -40,7 +40,7 @@ void solaris::Assembler::ConstructJob(Co
   for (const auto &II : Inputs)
     CmdArgs.push_back(II.getFilename());
 
-  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
+  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("gas"));
   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
                                          Exec, CmdArgs, Inputs, Output));
 }