https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115371
Bug ID: 115371
Summary: Hard to decode error message when fixed underlying
type of enum is not declared
Product: gcc
Version: 14.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kamil_tym at wp dot pl
Target Milestone: ---
The following one line program forgot #include <cstdint> for declaration of
std::uint64_t:
enum class E : std::uint64_t {};
g++ (with no extra diagnostic options) reports following errors and warnings
here:
<source>:1:6: warning: elaborated-type-specifier for a scoped enum must not use
the 'class' keyword
1 | enum class E : std::uint64_t {};
| ~~~~ ^~~~~
| -----
<source>:1:12: error: use of enum 'E' without previous declaration
1 | enum class E : std::uint64_t {};
| ^
<source>:1:14: error: expected unqualified-id before ':' token
1 | enum class E : std::uint64_t {};
| ^
The issue with the program is that std::uint64_t is not declared, but the error
messages make it really difficult to understand. clang for example produces a
more useful message: 'identifier std is not declared', correctly identifying
the issue.
Godbolt link to reproduction: https://godbolt.org/z/9fjjG9KE9
