https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93804
Bug ID: 93804
Summary: exempt extern "C" headers from -Wredundant-tags
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
As noted in https://gcc.gnu.org/ml/gcc-patches/2020-02/msg01016.html,
-Wredundant-tags is not useful for declarations in shared C/C++ headers that
cannot be changed to drop the tag. For example:
$ cat t.C && gcc -S -Wredundant-tags -Wsystem-headers t.C
#include <time.h>
In file included from /usr/include/bits/time.h:73,
from /usr/include/time.h:33,
from t.C:1:
/usr/include/bits/timex.h:37:3: warning: redundant class-key ‘struct’ in
reference to ‘struct timeval’ [-Wredundant-tags]
37 | struct timeval time; /* (read only, except for ADJ_SETOFFSET) */
| ^~~~~~
| ------
In file included from /usr/include/time.h:33,
from t.C:1:
/usr/include/bits/time.h:78:51: warning: redundant class-key ‘struct’ in
reference to ‘struct timex’ [-Wredundant-tags]
78 | extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx)
__THROW;
| ^~~~~~
| ------
In file included from /usr/include/time.h:48,
from t.C:1:
/usr/include/bits/types/struct_itimerspec.h:10:5: warning: redundant class-key
‘struct’ in reference to ‘struct timespec’ [-Wredundant-tags]
10 | struct timespec it_interval;
| ^~~~~~
| ------
/usr/include/bits/types/struct_itimerspec.h:11:5: warning: redundant class-key
‘struct’ in reference to ‘struct timespec’ [-Wredundant-tags]
11 | struct timespec it_value;
| ^~~~~~
| ------
...
