add features section in help msg

src/argparse.cpp

@@ -20,6 +20,20 @@ void print_help(const char *argv0)
     "\n- (*) \"some extended info\" currently means the total uncompressed size of the pages and"
     "\n      their compression ratio."
     "\n"
+    "\nFEATURES:"
+    "\n  gfx: "
+#ifdef RNT_NO_GFX
+    "✗"
+#else
+    "✓"
+#endif
+    "\n  optimized: "
+#ifndef NDEBUG
+    "✗"
+#else
+    "✓"
+#endif
+    "\n"
   , argv0);
 }
 

src/rntviewer.cpp

@@ -90,11 +90,11 @@ using ROOT::Experimental::Internal::RNTupleSerializer;
 #include "str.cpp"
 #include "tfile.cpp"
 #include "rntuple.cpp"
-#include "hover.cpp"
 #include "render_term.cpp"
 #include "argparse.cpp"
 
 #ifndef RNT_NO_GFX
+#include "hover.cpp"
 #include "render.cpp"
 #include "mainloop.cpp"
 #endif // RNT_NO_GFX