[Gdal-dev] Re: RESOLVED: GDAL support for GML w/ Xerces 2.3.0

[Jack Varga]

 From Xerces C 2.3.0  doc/html/program-others.html#CPPNamespace...

Xerces-C++ 2.3.0 now supports C++ Namespace.

- users' applications must namespace qualified all the Xerces-C++ 
classes/data/variables with "xercesc::" or add the "using namespace 
xercesc" clause.

So I modified configure so it would pass conftest...

$ diff ../clean/configure ..modifiedl/configure
21076,21078c21076,21078
<     LIBS="-lxerces-c1_6_0 -lpthread $LIBS"
<     if test -f /usr/local/lib/libxerces-c1_6_0.so ; then
<       LIBS="-L/usr/local/lib $LIBS"
---
 >     LIBS="-lxerces-c -lpthread $LIBS"         # was  
LIBS="-lxerces-c1_6_0"
 >     if test -f /usr/local/xerces-c-2_3_0/lib/libxerces-c.so.23.0 ; then
 >       LIBS="-L/usr/local/xerces-c-2_3_0/lib $LIBS"
21084,21085c21084,21085
<     if test -d /usr/local/include/xercesc ; then
<       XERCES_INCLUDE="-I/usr/local/include/xercesc"
---
 >     if test -d /usr/local/xerces-c-2_3_0 ; then
 >       XERCES_INCLUDE="-I/usr/local/xerces-c-2_3_0/include"
21091c21091,21096
<   echo '#include <util/PlatformUtils.hpp>' > conftest.cpp
---
 >   # Xerces-C++ 2.3.0 now supports C++ Namespace.
 >   # From doc/html/program-others.html#CPPNamespace
 >   echo '#include <xercesc/util/PlatformUtils.hpp>' > conftest.cpp
 >   echo '#include <xercesc/sax/HandlerBase.hpp>' >> conftest.cpp
 >   echo '#define XERCES_HAS_CPP_NAMESPACE' >> conftest.cpp
 >   echo 'using namespace xercesc;' >> conftest.cpp

I also modified ogr/ogrsf_frmts/gml/gmlreaderp.h  (although not clear 
why this was necessary using namespaces)

diff ../clean/gdal/ogr/ogrsf_frmts/gml/gmlreaderp.h 
../modified/gdal/ogr/ogrsf_frmts/gml/gmlreaderp.h
64,68c64,68
< #include <util/PlatformUtils.hpp>
< #include <sax2/DefaultHandler.hpp>
< #include <sax2/ContentHandler.hpp>
< #include <sax2/SAX2XMLReader.hpp>
< #include <sax2/XMLReaderFactory.hpp>
---
 > #include <xercesc/util/PlatformUtils.hpp>
 > #include <xercesc/sax2/DefaultHandler.hpp>
 > #include <xercesc/sax2/ContentHandler.hpp>
 > #include <xercesc/sax2/SAX2XMLReader.hpp>
 > #include <xercesc/sax2/XMLReaderFactory.hpp>

Not sure all this was necessary, (I'm not a big C++ coder) but its what 
I needed to compile in support for Xerces 2.3.0 and GML and wanted some 
place to document my modifications in the chance it can help someone else...

-jv
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