[Bug c++/59838] ICE with an enum using an incomplete type

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59838

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This seems to fix it.

--- a/gcc/cp/cvt.c
+++ b/gcc/cp/cvt.c
@@ -753,6 +753,7 @@ ocp_convert (tree type, tree expr, int convtype, int flags,
             unspecified.  */
          if ((complain & tf_warning)
              && TREE_CODE (e) == INTEGER_CST
+             && ENUM_UNDERLYING_TYPE (type)
              && !int_fits_type_p (e, ENUM_UNDERLYING_TYPE (type)))
            warning_at (loc, OPT_Wconversion, 
                        "the result of the conversion is unspecified because "