OpCodeProviderImpl::initFuncOpCode: warn if there is no opcode mapping

During loading an xlsx document in an --enable-dbgutil build
OpCodeProviderImpl::OpCodeProviderImpl() spits out a warning
"OpCodeProviderImpl::OpCodeProviderImpl - opcodes not initialized"

OpCodeProviderImpl::initFuncOpCode() now gives a clue which.

Change-Id: Ia0bc53ce5a590e6904c660cd725d907efa5a731d

sc/source/filter/oox/formulabase.cxx

@@ -33,6 +33,7 @@
 #include <com/sun/star/sheet/XFormulaParser.hpp>
 #include <rtl/strbuf.hxx>
 #include <rtl/ustrbuf.hxx>
+#include <sal/log.hxx>
 #include "oox/core/filterbase.hxx"
 #include "oox/helper/containerhelper.hxx"
 #include "oox/token/properties.hxx"
@@ -1228,6 +1229,9 @@ bool OpCodeProviderImpl::initFuncOpCode( FunctionInfo& orFuncInfo, const ApiToke
         {
             // ignore entries for functions unknown by Calc *and* by Excel
             bIsValid = orFuncInfo.maOoxFuncName.isEmpty();
+            SAL_WARN_IF( !bIsValid, "sc",
+                    "OpCodeProviderImpl::initFuncOpCode - no opcode mapping for function ODF '" <<
+                    orFuncInfo.maOdfFuncName << "' <-> OOXML '" << orFuncInfo.maOoxFuncName << "'");
         }
     }
     else if( orFuncInfo.mnBiffFuncId == BIFF_FUNC_EXTERNCALL )