Thorn.m: Eliminate some code in the case that no symmetries need to be registered

This avoids a compiler warning about an unused variable

1 files changed, 3 insertions, 1 deletions

diff --git a/Tools/CodeGen/Thorn.m b/Tools/CodeGen/Thorn.m
index 74259c4..a86d969 100644
--- a/Tools/CodeGen/Thorn.m
+++ b/Tools/CodeGen/Thorn.m
@@ -679,13 +679,15 @@ CreateSymmetriesRegistrationSource[thornName_, implementationName_, GFs_, reflec
         {"cctk.h", "cctk_Arguments.h", "cctk_Parameters.h", "Symmetry.h"}],
 
    DefineCCTKFunction[ thornName <> "_RegisterSymmetries", "void", 
+     If[Length[spec] > 0,
      {CommentedBlock["array holding symmetry definitions",
 
       "CCTK_INT sym[3];\n\n"],
 
       CommentedBlock["Register symmetries of grid functions",
 
-      Map[SymmetriesBlock, spec]]}
+      Map[SymmetriesBlock, spec]]},
+     {}]
 ]
   };