https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53815
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Keywords| |diagnostic
Last reconfirmed| |2021-08-13
Severity|minor |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, this is just a diagnostic issue.
You are missing class or an underlying type.
ICC gives the closest but still misses the point slightly:
<source>(13): error: an unscoped enumeration must be opaque in order to be
specialized
template <> enum Foo<int>::E12
^
<source>(15): error: enumerator already declared (see constant "Foo<x>::a [with
x=int]" (declared at line 5))
a, b, c
^
For C++98, gcc gives a decent error message:
<source>:13:19: error: multiple definition of 'enum Foo<int>::E12'
13 | template <> enum Foo<int>::E12
| ^~~~~~~~
<source>:5:11: note: previous definition here
5 | enum E12 { a };
| ^~~
Though this could be improved, clang gives a decent one there:
<source>:14:1: error: enumeration cannot be a template
{
^
<source>:13:13: error: declaration does not declare anything
template <> enum Foo<int>::E12
^
ICC is not bad either:
<source>(13): error: enum "Foo<x>::E12 [with x=int]" cannot be defined in the
current scope
template <> enum Foo<int>::E12
^
