[OpenMP] Make Xopenmp-target args compile-only to silence warnings

Summary:
Previously we needed the `Xopenmp-target=` option during the linking
phase so the old offloading driver knew which items to extract and link
for the device. Now that the new driver has become the default this is
no longer necessary and will cause a warning to be emitted for the
unused argument. This should be silenced to avoid noise.

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index a1f4075..6ec7ddb 100644 (file)
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -812,9 +812,9 @@ def Xcuda_fatbinary : Separate<["-"], "Xcuda-fatbinary">,
   HelpText<"Pass <arg> to fatbinary invocation">, MetaVarName<"<arg>">;
 def Xcuda_ptxas : Separate<["-"], "Xcuda-ptxas">,
   HelpText<"Pass <arg> to the ptxas assembler">, MetaVarName<"<arg>">;
-def Xopenmp_target : Separate<["-"], "Xopenmp-target">,
+def Xopenmp_target : Separate<["-"], "Xopenmp-target">, Group<CompileOnly_Group>,
   HelpText<"Pass <arg> to the target offloading toolchain.">, MetaVarName<"<arg>">;
-def Xopenmp_target_EQ : JoinedAndSeparate<["-"], "Xopenmp-target=">,
+def Xopenmp_target_EQ : JoinedAndSeparate<["-"], "Xopenmp-target=">, Group<CompileOnly_Group>,
   HelpText<"Pass <arg> to the target offloading toolchain identified by <triple>.">,
   MetaVarName<"<triple> <arg>">;
 def z : Separate<["-"], "z">, Flags<[LinkerInput, RenderAsInput]>,