https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91076
Bug ID: 91076
Summary: wrong class-key in mentioned in a diagnostic note
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
When a type defined with one class-key (such as "class") contains a member such
as a pointer to the same type that uses a different class-key (such as
"struct") the C++ front-end replaces the original class-key associated with the
type with the one used in the member. This causes problems in GCC code that
examines the class-key by using CLASSTYPE_DECLARED_CLASS (t) or by calling
class_key_or_enum_as_string (). A test case illustrating this bug is as
follows:
$ cat a.C && gcc -S -Wall -Wextra a.C
class A // uses CLASS
{
public:
struct A *p; // uses STRUCT
}
[[maybe_unused]]; // misleading warning refers to STRUCT
a.C:6:1: warning: attribute ignored in declaration of ‘struct A’ [-Wattributes]
6 | [[maybe_unused]]; // misleading warning refers to STRUCT
| ^
a.C:6:1: note: attribute for ‘struct A’ must follow the ‘struct’ keyword
