https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109316
Bug ID: 109316
Summary: incorrect "warning: declaration does not declare
anything" for anonymous enums in structs, for
-std=(gnu|c)-17
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: jason.vas.dias at gmail dot com
Target Milestone: ---
Just a niggle:
I don't think this code should produce a warning,
but under GCC 12, with -std=gnu17 or -std=c17,
or without any '-std=' setting in C language mode,
it does:
'struct S { int a; enum { S_O_a = 0 }; }';
/tmp/b.c:1:37: warning: declaration does not declare anything
1 | struct S { int a; enum { S_O_a = 0 }; };
|
Yes, I know the enumeration declaration does not
add anything to the struct declaration, (intentionally!),
but in fact GCC HAS inserted DWARF debuginfo for the
enumerator 'S_O_a' in the debug_info section , which
can be used by code in which case the constant is
interpolated into the output machine code, so something
HAS been declared here ...
