https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127779
Bug ID: 127779
Summary: Cannot apply __attribute__((unused)) to goto labels
Product: gcc
Version: 16.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: luca.bacci at outlook dot com
Target Milestone: ---
Docs for -Wunused-label say [1]:
> -Wunused-label: warn whenever a label is declared but not used [...].
> To suppress this warning use the unused attribute.
And docs for 'attribute unused' say:
> unused: this attribute can be attached to a function, variable, structure
field, type declaration, or label.
However applying __attribute__((unused)) to a label results in syntax errors:
int
func (void)
{
__attribute__((unused))
retry:
return 0;
}
Compiler output is [3]:
> error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
References:
[1]
https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wunused-label
[2] https://gcc.gnu.org/onlinedocs/gcc/Common-Attributes.html#index-unused
[3] https://godbolt.org/z/5sfjrdnns
Best Regards!
Luca
