fix math export/import in docx/rtf

For some reason older gcc versions don't manage to dynamic_cast
to the necessary cast. I'm not quite sure why, forcing sal/osl/unx/module.cxx
to always use RTLD_GLOBAL does not seem to help. Most probably
compiler bug. Changing the cast to two simpler ones helps.

3 files changed, 15 insertions, 4 deletions

diff --git a/writerfilter/Library_writerfilter.mk b/writerfilter/Library_writerfilter.mk
index 3c30b36892b5..202990d6472d 100644
--- a/writerfilter/Library_writerfilter.mk
+++ b/writerfilter/Library_writerfilter.mk
@@ -74,6 +74,7 @@ $(eval $(call gb_Library_use_libraries,writerfilter,\
     msfilter \
     oox \
     sal \
+    sfx \
     sot \
     svt \
     tl \
diff --git a/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx b/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
index 680109b225c5..a4803a948b18 100644
--- a/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
+++ b/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
@@ -33,6 +33,7 @@
 #include <comphelper/embeddedobjectcontainer.hxx>
 #include <tools/globname.hxx>
 #include <comphelper/classids.hxx>
+#include <sfx2/sfxbasemodel.hxx>
 #include "OOXMLFastContextHandler.hxx"
 #include "OOXMLFactory.hxx"
 #include "Handler.hxx"
@@ -2441,8 +2442,12 @@ void OOXMLFastContextHandlerMath::process()
     OUString aName;
     uno::Reference< embed::XEmbeddedObject > ref = container.CreateEmbeddedObject( name.GetByteSequence(), aName );
     uno::Reference< uno::XInterface > component( ref->getComponent(), uno::UNO_QUERY );
-    if( oox::FormulaImportBase* import = dynamic_cast< oox::FormulaImportBase* >( component.get()))
-        import->readFormulaOoxml( buffer );
+// gcc4.4 (and 4.3 and possibly older) have a problem with dynamic_cast directly to the target class,
+// so help it with an intermediate cast. I'm not sure what exactly the problem is, seems to be unrelated
+// to RTLD_GLOBAL, so most probably a gcc bug.
+    oox::FormulaImportBase* import = dynamic_cast< oox::FormulaImportBase* >( dynamic_cast< SfxBaseModel* >(component.get()));
+    assert( import != NULL );
+    import->readFormulaOoxml( buffer );
     if (isForwardEvents())
     {
         OOXMLPropertySet * pProps = new OOXMLPropertySetImpl();
diff --git a/writerfilter/source/rtftok/rtfdocumentimpl.cxx b/writerfilter/source/rtftok/rtfdocumentimpl.cxx
index f27050a9915c..812054003135 100644
--- a/writerfilter/source/rtftok/rtfdocumentimpl.cxx
+++ b/writerfilter/source/rtftok/rtfdocumentimpl.cxx
@@ -51,6 +51,7 @@
 #include <tools/globname.hxx>
 #include <comphelper/classids.hxx>
 #include <comphelper/embeddedobjectcontainer.hxx>
+#include <sfx2/sfxbasemodel.hxx>
 
 #include <oox/mathml/import.hxx>
 #include <doctok/sprmids.hxx> // NS_sprm namespace
@@ -3635,8 +3636,12 @@ int RTFDocumentImpl::popState()
         OUString aName;
         uno::Reference<embed::XEmbeddedObject> xObject = aContainer.CreateEmbeddedObject(aGlobalName.GetByteSequence(), aName);
         uno::Reference<util::XCloseable> xComponent(xObject->getComponent(), uno::UNO_QUERY);
-        if( oox::FormulaImportBase* pImport = dynamic_cast<oox::FormulaImportBase*>(xComponent.get()))
-            pImport->readFormulaOoxml(m_aMathBuffer);
+// gcc4.4 (and 4.3 and possibly older) have a problem with dynamic_cast directly to the target class,
+// so help it with an intermediate cast. I'm not sure what exactly the problem is, seems to be unrelated
+// to RTLD_GLOBAL, so most probably a gcc bug.
+        oox::FormulaImportBase* pImport = dynamic_cast<oox::FormulaImportBase*>(dynamic_cast<SfxBaseModel*>(xComponent.get()));
+        assert( pImport != NULL );
+        pImport->readFormulaOoxml(m_aMathBuffer);
         RTFValue::Pointer_t pValue(new RTFValue(xObject));
         RTFSprms aMathAttributes;
         aMathAttributes.set(NS_ooxml::LN_starmath, pValue);