https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120354
Bug ID: 120354
Summary: Flexible array union in the middle is not reported by
-Wflex-array-member-not-at-end option when flexible
array member is not the last one
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: alansnape3058 at gmail dot com
Target Milestone: ---
Details and comparison with Clang in
The unions containing a flexible array member that is not the last one are not
considered flexible array unions.
```
union X {
int x[];
int y;
};
struct T {
union X x;
int plug;
};
```
In this example, the flexible array member in `union X` is not the last
element. However, it is still a flexible array union. When using this union to
define a member in the middle of another struct, the usage is not reported.
This is also true when referencing a flexible array struct in the union.
```
struct Q {
int len;
int data[];
};
union Y {
struct Q q;
int y;
};
struct S {
union Y y;
int plug;
};
```
