https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109222
Bug ID: 109222
Summary: Confusing error for declaring an enum class with
unknown type
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: barry.revzin at gmail dot com
Target Milestone: ---
This program fails to compile (as it should, since the first line is commented
out):
// using i32 = int;
enum class E : i32 { red, green, blue };
But the error is...
<source>:2:6: warning: elaborated-type-specifier for a scoped enum must not use
the 'class' keyword
2 | enum class E : i32 { red, green, blue };
| ~~~~ ^~~~~
| -----
<source>:2:14: error: found ':' in nested-name-specifier, expected '::'
2 | enum class E : i32 { red, green, blue };
| ^
| ::
<source>:2:12: error: 'E' has not been declared
2 | enum class E : i32 { red, green, blue };
| ^
<source>:2:20: error: expected unqualified-id before '{' token
2 | enum class E : i32 { red, green, blue };
| ^
In this case I was missing an include for the typedef, but boy did that take me
a while to figure out.
