https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99981
Bug ID: 99981
Summary: Misleading "conflicting declaration" error message
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jmarshall at hey dot com
Target Milestone: ---
For the following C++ snippet,
//// forward.cpp
struct foo;
typedef struct {
int i;
} foo;
////
both GCC 10.2.0 and current trunk (according to godbolt.org) produce
forward.cpp:5:3: error: conflicting declaration 'typedef struct foo foo'
5 | } foo;
| ^~~
forward.cpp:1:8: note: previous declaration as 'struct foo'
1 | struct foo;
| ^~~
It is a relatively minor issue, but "typedef struct foo foo" in the first
diagnostic is misleading. I would have expected to see "typedef struct ... foo"
or similar.
(If the code had indeed been "typedef struct foo { /*...*/ } foo", there would
be no error.)
