[Bug c/18799] New: error: static declaration of 'x' follows non-static declaration

["markus at oberhumer dot com" <gcc-bugzilla@gcc.gnu.org>]

This code used to give a warning on gcc 3.2 and gcc 3.3, gcc 3.4 does not warn
at all, and current mainline 4.0 makes this an error.

What do the C89 and C99 standards actually say here ?

+ cat x.c
extern int x[];
static int x[2];
int *foo(void) { return x; }

+ gcc-3.2 -std=c89 -Wall -W -pedantic -c x.c
x.c:2: warning: static declaration for `x' follows non-static

+ gcc-3.3 -std=c89 -Wall -W -pedantic -c x.c
x.c:2: warning: static declaration for `x' follows non-static

+ gcc-3.4 -std=c89 -Wall -W -pedantic -c x.c

+ gcc-4.0 -std=c89 -Wall -W -pedantic -c x.c
x.c:2: error: static declaration of 'x' follows non-static declaration
x.c:1: error: previous declaration of 'x' was here

+ gcc-3.2 -std=c99 -Wall -W -pedantic -c x.c
x.c:2: warning: static declaration for `x' follows non-static

+ gcc-3.3 -std=c99 -Wall -W -pedantic -c x.c
x.c:2: warning: static declaration for `x' follows non-static

+ gcc-3.4 -std=c99 -Wall -W -pedantic -c x.c

+ gcc-4.0 -std=c99 -Wall -W -pedantic -c x.c
x.c:2: error: static declaration of 'x' follows non-static declaration
x.c:1: error: previous declaration of 'x' was here

-- 
           Summary: error: static declaration of 'x' follows non-static
                    declaration
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: markus at oberhumer dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18799