https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106424
Bug ID: 106424
Summary: __attribute__ unused confuses -Wshadow when placed on
internal parameter of fn ptr
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: rusty at rustcorp dot com.au
Target Milestone: ---
OK, this is a weird one. I have some automated code which adds attributes
and it (overzealously) added it to the internal parameter of a callback:
void func(char *arg,
void (*cb)(char *arg __attribute__((__unused__))))
{ }
With -Wshadow=local (and -Wshadow) this gives a spurious warning:
foo.c:2:28: warning: declaration of ‘arg’ shadows a parameter [-Wshadow]
2 | void (*cb)(char *arg __attribute__((__unused__))))
| ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:1:17: note: shadowed declaration is here
1 | void func(char *arg,
| ~~~~~~^~~
