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* [Bug c/54162] New: Does not accept static global anonymous unions or structs
@ 2012-08-02 23:04 josh at joshtriplett dot org
2012-08-02 23:23 ` [Bug c/54162] " joseph at codesourcery dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: josh at joshtriplett dot org @ 2012-08-02 23:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54162
Bug #: 54162
Summary: Does not accept static global anonymous unions or
structs
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: josh@joshtriplett.org
C1X, and numerous other compilers, support static anonymous unions or structs
at file scope. For example, the following code should work with a C1X
compiler:
static union {
unsigned x;
unsigned y;
};
int main(void)
{
x = 5;
return y;
}
However, GCC says:
test.c:4:1: warning: unnamed struct/union that defines no instances [enabled by
default]
test.c: In function ‘main’:
test.c:8:5: error: ‘x’ undeclared (first use in this function)
test.c:8:5: note: each undeclared identifier is reported only once for each
function it appears in
test.c:9:12: error: ‘y’ undeclared (first use in this function)
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/54162] Does not accept static global anonymous unions or structs
2012-08-02 23:04 [Bug c/54162] New: Does not accept static global anonymous unions or structs josh at joshtriplett dot org
@ 2012-08-02 23:23 ` joseph at codesourcery dot com
2012-08-03 8:07 ` rguenth at gcc dot gnu.org
2012-08-20 14:50 ` [Bug c/54162] Please accept static global anonymous unions or structs as an extension josh at joshtriplett dot org
2 siblings, 0 replies; 4+ messages in thread
From: joseph at codesourcery dot com @ 2012-08-02 23:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54162
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-08-02 23:23:19 UTC ---
On Thu, 2 Aug 2012, josh at joshtriplett dot org wrote:
> C1X, and numerous other compilers, support static anonymous unions or structs
> at file scope. For example, the following code should work with a C1X
> compiler:
No it shouldn't. Anonymous structures and unions are *members* of a
containing structure or union, not declarations outside such a context;
see C11 6.7.2.1 paragraph 13. The constraint in 6.7 paragraph 2 applies:
"A declaration other than a static_assert declaration shall declare at
least a declarator (other than the parameters of a function or the members
of a structure or union), a tag, or the members of an enumeration.". Your
union declares none of those.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/54162] Does not accept static global anonymous unions or structs
2012-08-02 23:04 [Bug c/54162] New: Does not accept static global anonymous unions or structs josh at joshtriplett dot org
2012-08-02 23:23 ` [Bug c/54162] " joseph at codesourcery dot com
@ 2012-08-03 8:07 ` rguenth at gcc dot gnu.org
2012-08-20 14:50 ` [Bug c/54162] Please accept static global anonymous unions or structs as an extension josh at joshtriplett dot org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-08-03 8:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54162
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-03 08:07:12 UTC ---
Thus invalid.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/54162] Please accept static global anonymous unions or structs as an extension
2012-08-02 23:04 [Bug c/54162] New: Does not accept static global anonymous unions or structs josh at joshtriplett dot org
2012-08-02 23:23 ` [Bug c/54162] " joseph at codesourcery dot com
2012-08-03 8:07 ` rguenth at gcc dot gnu.org
@ 2012-08-20 14:50 ` josh at joshtriplett dot org
2 siblings, 0 replies; 4+ messages in thread
From: josh at joshtriplett dot org @ 2012-08-20 14:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54162
Josh Triplett <josh at joshtriplett dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|INVALID |
Summary|Does not accept static |Please accept static global
|global anonymous unions or |anonymous unions or structs
|structs |as an extension
--- Comment #3 from Josh Triplett <josh at joshtriplett dot org> 2012-08-20 14:50:35 UTC ---
How odd. Quite a number of sources seem to suggest that C11 allows this. But
in any case, several other compilers *do* allow this syntax; thus, reopening
this and turning it into a request for an extension.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-08-20 14:50 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2012-08-02 23:04 [Bug c/54162] New: Does not accept static global anonymous unions or structs josh at joshtriplett dot org
2012-08-02 23:23 ` [Bug c/54162] " joseph at codesourcery dot com
2012-08-03 8:07 ` rguenth at gcc dot gnu.org
2012-08-20 14:50 ` [Bug c/54162] Please accept static global anonymous unions or structs as an extension josh at joshtriplett dot org
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