[PATCH] Fix for sw_filter_test crash due to ambiguous FieldEntry destructor

[Stephan Bergmann]

On 07/23/2012 05:28 PM, Stephan Bergmann wrote:
> On 07/23/2012 04:40 PM, Michael Stahl wrote:
>> On 22/07/12 11:25, Kristian Rietveld wrote:
>>> (Please keep me on CC as I am not subscribed to the list)
> [...]
>> that is really not supposed to happen, we really should build everything
>> with -fvisibility=hidden on all platforms where unnecessarily exported
>> symbols cause such problems (guess that means everything but Windows).
>>
>> on master and libreoffice-3-6, in solenv/gbuild/platform/macosx.mk the
>> -fvisibility=hidden is inside:
>>
>>> ifeq ($(HAVE_GCC_VISIBILITY_FEATURE),TRUE)
>>
>> can you check that that is actually detected properly for your compiler?
>
> Explicitly disabled for Clang on Mac OS X in configure.in, see
> <http://cgit.freedesktop.org/libreoffice/core/commit/?id=e5143062887093037cab8f936288af8408576ea8>
> "Visibility doesn't seem to work as we want in Apple's Clang."  :(

...and if you revert that (leading to HAVE_GCC_VISIBILITY_FEATURE=TRUE 
and HAVE_GCC_VISIBILITY_BROKEN=TRUE), the build starts to break as e.g. 
libxolo.dylib contains 
__ZN4cppu15WeakImplHelper6IN3com3sun4star8document7XFilterENS3_4lang12XServiceInfoENS4_9XExporterENS6_15XInitializationENS3_9container6XNamedENS6_10XUnoTunnelEE14queryInterfaceERKNS3_3uno4TypeE 
(aka "cppu::WeakImplHelper6<com::sun::star::document::XFilter, 
com::sun::star::lang::XServiceInfo, com::sun::star::document::XExporter, 
com::sun::star::lang::XInitialization, 
com::sun::star::container::XNamed, 
com::sun::star::lang::XUnoTunnel>::queryInterface(com::sun::star::uno::Type 
const&)") as "t" (nm: non-external text section symbol), causing the 
linking of liblnglo.dylib (module linguistic) to fail with "Undefined 
symbols for architecture i386: 
'cppu::WeakImplHelper6<com::sun::star::document::XFilter, 
com::sun::star::lang::XServiceInfo, com::sun::star::document::XExporter, 
com::sun::star::lang::XInitialization, 
com::sun::star::container::XNamed, 
com::sun::star::lang::XUnoTunnel>::queryInterface(com::sun::star::uno::Type 
const&)', referenced from: vtable for ConvDicXMLExport in convdicxml.o" etc.

With a Clang 3.1 build on Linux, on the other hand, that queryInterface 
symbol is exported from libxolo.so as "W" (nm: external weak symbol), so 
liblnglo.so can link against it.

Stephan