[Bug lto/54187] New: liblto_plugin.so broken with -fvisibility=hidden

[Bug lto/54187] New: liblto_plugin.so broken with -fvisibility=hidden

[wbrana at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54187

             Bug #: 54187
           Summary: liblto_plugin.so broken with -fvisibility=hidden
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: wbrana@gmail.com


liblto_plugin.so is broken if BOOT_CFLAGS includes -fvisibility=hidden
build system should add -fvisibility=normal for building liblto_plugin.so to
fix it

[Bug lto/54187] liblto_plugin.so broken with -fvisibility=hidden

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54187

Richard Guenther <rguenth at gcc dot gnu.org> changed:

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

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-06 08:31:02 UTC ---
What do you gain with -fvisibility-hidden?  Nothing, as for non-shared objects
it is already the default.  Not for GCC though because of our plugin API
(thus, --disable-plugins).

[Bug lto/54187] liblto_plugin.so broken with -fvisibility=hidden

[wbrana at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54187

--- Comment #2 from wbrana <wbrana at gmail dot com> 2012-08-06 08:57:43 UTC ---
Executables are smaller and loads faster with -fvisibility=hidden.
Since which version -fvisibility=hidden is enabled by default?
4.7.2 pre doesn't use -fvisibility=hidden by default.

[Bug lto/54187] liblto_plugin.so broken with -fvisibility=hidden

[wbrana at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54187

wbrana <wbrana at gmail dot com> changed:

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

--- Comment #3 from wbrana <wbrana at gmail dot com> 2012-08-06 09:29:09 UTC ---
I was wrong 4.7.2 pre is using -fvisibility=hidden by default, but cc1 isn't
built with -fvisibility=hidden.
Why it isn't possible to have cc1 built with -fvisibility=hidden and
liblto_plugin.so built without -fvisibility=hidden?

[Bug lto/54187] liblto_plugin.so broken with -fvisibility=hidden

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54187

Richard Guenther <rguenth at gcc dot gnu.org> changed:

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

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-06 10:45:38 UTC ---
All ELF executables have hidden visibility by default if you not export all
dynamic symbols with -Wl,--export-dynamic.  That's what we need for GCC plugins
(_not_ the linker plugin), because plugin shared objects need to be able to
bind to all cc1 symbols.  Thus, disable GCC plugins.