[Bug middle-end/38574] New: -fvisibility=hidden not affecting thread variables while attribute hidden does.

[Bug middle-end/38574] New: -fvisibility=hidden not affecting thread variables while attribute hidden does.

[hp at gcc dot gnu dot org]

Compile the following, with "-O2 -fvisibility=hidden -S" without/with -DH. 
Compare assembly code. For this target, you'll see the following diff, but the
difference was noticed on the CRIS TLS w.i.p. using [gcc-4_3-branch revision
135713]:

--- hh.s        2008-12-18 23:14:54.000000000 +0100
+++ h.s 2008-12-18 23:15:05.000000000 +0100
@@ -13,5 +13,6 @@ foo:
        popl    %ebp
        ret
        .size   foo, .-foo
+       .hidden xyzzy
        .ident  "GCC: (GNU) 4.3.0 20080428 (Red Hat 4.3.0-8)"
        .section        .note.GNU-stack,"",@progbits


-- 
           Summary: -fvisibility=hidden not affecting thread variables while
                    attribute hidden does.
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hp at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38574

[Bug middle-end/38574] -fvisibility=hidden not affecting thread variables while attribute hidden does.

[hp at gcc dot gnu dot org]

------- Comment #1 from hp at gcc dot gnu dot org  2008-12-18 22:21 -------
Oops, forgot the code:

extern __thread char xyzzy[64] __attribute__ ((tls_model
                                               ("initial-exec")
#ifdef H
                                               , visibility ("hidden")
#endif
                                               ));

char *
foo (void)
{
  return xyzzy+9;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38574

[Bug middle-end/38574] -fvisibility=hidden not affecting thread variables while attribute hidden does.

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2008-12-18 22:25 -------
Actually this is expected behavior of -fvisibility=hidden IIRC.  


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |middle-end


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38574

[Bug target/38574] -fvisibility=hidden not affecting thread variables while attribute hidden does.

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2008-12-18 22:24 -------
Works on PPC-linux-gnu on the trunk.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |target


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38574

[Bug middle-end/38574] -fvisibility=hidden not affecting thread variables while attribute hidden does.

[hp at gcc dot gnu dot org]

------- Comment #4 from hp at gcc dot gnu dot org  2008-12-18 22:35 -------
(In reply to comment #3)
> Actually this is expected behavior of -fvisibility=hidden IIRC.  

Oh right, it's at the end of the doc paragraph.
Ok, I've done my share of the noise for today. :)


-- 

hp at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38574