[Bug c++/79184] [7 Regression] -Wint-in-bool-context triggered erroneously in template parameter

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79184

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I suppose we'll have to use something like

--- a/gcc/cp/cvt.c
+++ b/gcc/cp/cvt.c
@@ -798,7 +798,15 @@ ocp_convert (tree type, tree expr, int convtype, int
flags,
         to the underlying type first.  */
      if (SCOPED_ENUM_P (intype) && (convtype & CONV_STATIC))
        e = build_nop (ENUM_UNDERLYING_TYPE (intype), e);
-     return cp_truthvalue_conversion (e);
+     if (complain & tf_warning)
+       return cp_truthvalue_conversion (e);
+     else
+       {
+         /* Prevent bogus -Wint-in-bool-context warnings coming
+            from c_common_truthvalue_conversion down the line.  */
+         warning_sentinel w (warn_int_in_bool_context);
+         return cp_truthvalue_conversion (e);
+       }
    }

       converted = convert_to_integer_maybe_fold (type, e, dofold);

(that makes g++ not warn at all on the test from Comment 2)