https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88893
Bug ID: 88893
Summary: Forward declaring of enum class with visibility
results in -Wattributes false positive.
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: Predelnik at gmail dot com
Target Milestone: ---
The following program
enum class azaza;
enum class __attribute__ ((visibility ("default"))) azaza
{
};
compiled with no arguments gives:
<source>:2:53: warning: type attributes ignored after type is already defined
[-Wattributes]
2 | enum class __attribute__ ((visibility ("default"))) azaza
| ^~~~~
Since making enum classes visible may be needed w.r.t libc++ type_info
behavior. This warning turns out to be a bit annoying in this case since
clang++ compiles code fine.
This problem was partially fixed in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43407
But with forward declaration old behavior still shows through.
