[Bug c/28744] New: externally_visible attribute not effective with prior declaration of symbol.

dwmw2 at infradead dot org gcc-bugzilla@gcc.gnu.org
Tue Aug 15 20:01:00 GMT 2006


$ cat foo.c
extern char *bar1 __attribute__((externally_visible));
char *bar1;

extern char *bar2 __attribute__((externally_visible));
char *bar2 __attribute__((externally_visible));

extern char *bar3;
char *bar3 __attribute__((externally_visible));

char *bar4 __attribute__((externally_visible));

char *bar5;
extern char *bar5 __attribute__((externally_visible));
 $ gcc -O -fwhole-program -c -o foo.o foo.c
foo.c:1: warning: ‘externally_visible’ attribute have effect only on public
objects
foo.c:4: warning: ‘externally_visible’ attribute have effect only on public
objects
foo.c:13: warning: ‘externally_visible’ attribute have effect only on public
objects
 $ nm -a foo.o | grep bar
00000004 C bar4

All five of these variables ought to be externally visible.
Note -fwhole-program.

Seen with:
(ppc) gcc version 4.1.1 20060525 (Red Hat 4.1.1-1.pr27898)
(ppc->i686) gcc version 4.1.0


-- 
           Summary: externally_visible attribute not effective with prior
                    declaration of symbol.
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dwmw2 at infradead dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28744



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