Driver: Add support for a new -nostdlibinc option.

 - This disables the system include directories, but not the compiler builtin
   directories. Useful for projects that want to use things like the intrinsic
   headers, but are otherwise freestanding.

 - I'm willing to reconsider the option naming, I also considered providing an
   explicit -builtinc (which would match -nobuiltininc), but this is more
   consistent with existing options.

llvm-svn: 141692

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 07d2a681898..e0efe822864 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1486,6 +1486,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-nostdsysteminc");
     CmdArgs.push_back("-nobuiltininc");
   } else {
+    if (Args.hasArg(options::OPT_nostdlibinc))
+        CmdArgs.push_back("-nostdsysteminc");
     Args.AddLastArg(CmdArgs, options::OPT_nostdincxx);
     Args.AddLastArg(CmdArgs, options::OPT_nobuiltininc);
   }