[Bug other/55530] New: Visibility warning not always shown

[Bug other/55530] New: Visibility warning not always shown

[jaak at ristioja dot ee]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55530

             Bug #: 55530
           Summary: Visibility warning not always shown
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jaak@ristioja.ee


struct __attribute__ ((visibility("internal"))) A {};
struct B { A * a; }; /* warning: 'B' declared with greater visibility than the
type of its field 'B::a' [-Wattributes] */

struct C;
struct D { B * a; }; /* No warning */
struct __attribute__ ((visibility("internal"))) C {};

Similar behaviour with both gcc and g++.

$ gcc -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.3/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-4.6.3/work/gcc-4.6.3/configure
--prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --with-ppl --with-cloog --disable-ppl-version-check
--with-cloog-include=/usr/include/cloog-ppl --enable-lto --disable-nls
--with-system-zlib --enable-obsolete --disable-werror --enable-secureplt
--enable-multilib --enable-libmudflap --disable-libssp --enable-libgomp
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/python
--enable-checking=release --disable-libgcj --enable-languages=c,c++,go,fortran
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-targets=all --with-bugurl=http://bugs.gentoo.org/
--with-pkgversion='Gentoo 4.6.3 p1.8, pie-0.5.2'
Thread model: posix
gcc version 4.6.3 (Gentoo 4.6.3 p1.8, pie-0.5.2)

Please move bug to the appropriate component.

[Bug other/55530] Visibility warning not always shown

[jaak at ristioja dot ee]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55530

--- Comment #1 from Jaak Ristioja <jaak at ristioja dot ee> 2012-11-29 13:37:29 UTC ---
Sorry, the minimal testcase should have been:

struct __attribute__ ((visibility("internal"))) A {};
struct B { A * a; }; /* warning: 'B' declared with greater visibility than the
type of its field 'B::a' [-Wattributes] */

struct C;
struct D { C * c; }; /* No warning */
struct __attribute__ ((visibility("internal"))) C {};

[Bug other/55530] Visibility warning not always shown

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55530

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-12-09
     Ever Confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-12-09 01:54:20 UTC ---
The warning happens when the struct at definition time rather than at the end
of compilation.  Maybe we should warn about the case where the forward
declaration and definitions are two different visibility.