[xsd-users] multiple definitions errors

[Henderson, H.C. (Henk)]

Hello Boris,

Thank you for the suggestions. I think that I have already done what you suggest but I have a couple of questions.
Let me tell you which steps I have done on a system without xsd and xerces on it:

1) 
I first installed the binary xsd-4.0.0-14.el7.x86_64.rpm on my CentOS 7 system that can be found on the  CodeSythesis site with the command

>rpm -Uvh  xsd-4.0.0-14.el7.x86_64.rpm

2)
After the install the xsd program can be found in the directory /usr/bin.
With the xsd program I generate code from my xsd file.
For each xsd I use the command (for example for the file MsdlSimpleTypes.xsd with the result in the output directory msdlGenCode)

> ./xsd cxx-tree --generate-serialization --output-dir msdlGenCode MsdlSimpleTypes.xsd

3)
In this step I include all the generated code from the msdlGenCode directory in my eclipse project so I can use it.

4) 
The I try to compile my code (For my code I have to build a shared object that will be included as a plugin in a standard application) .
The hxx-files of xsd can be found since the rpm installer placed them in the directory  /usr/include and that path is present in my project.
In my generated code there are a lot of includes like cxx/tree/......hxx 

Compiling fails since I also need xerces include files that are not there. In the installer on linux xerces is not included.

And here my first question. How do I know which version of xerces the xsd is using ???

When I go to the CodeSynthesis website (on the page CodeSythesis XSD Download) I find a link to xerces
There I find xerces-c-3.2.0.tar.gz. Since I don't know which version to us I continue with this version, is that OK ???
For this version is no binary available so I try to build that with the instructions given on another page:
========================================================================================================================
Xerces-C++

If you already have Xerces-C++ libraries and development files installed on your system, you can skip this sections and proceed to the next section.

Download the latest Xerces-C++ source release from the Xerces-C++ download page. Then follow these build instructions:

$ cd
$ gzip -d xerces-c-3.1.1.tar.gz
$ tar xf xerces-c-3.1.1.tar
$ cd xerces-c-3.1.1
$ ./configure --disable-threads --disable-network \
--disable-shared CXXFLAGS=-O2 CFLAGS=-O2
$ cd src
$ make

The above command sequence builds Xerces-C++ as a static library. If you would prefer to build a shared library, replace the --disable-shared option with --disable-static.
========================================================================================================================

I followed the suggestions changing 3.1.1 in 3.2.0 and ALSO changed the --disable-shared in --disable-static but after doing the make instruction I cannot find a xerces shared object file.

5)
When I include the directory xerces-c-3.2.0 in my include path of my eclipse project then the code compiles and links. So the result of my program is a shared object but when I run my application with the shared object as plugin then I get the undefined symbol message of xerces. That could be correct since there is no xerces shared library.

6)
After that I also try to use the xerces-c-3.1.1 binary installer (xerces-c-3.1.1-x86-64-linux-gcc-3.4.tar.gz)  that can be found in the archive. Of course after the install I build my program again with the changed xerces include directory  That gives the same undefines  symbol error. In my library path (LD_LIBRARY_PATH) the location of the xerces shared library is added. 

Note that (g++ --version) gives Red Hat version 4.8.5-11 so I am using a different compiler.

Conclusion: What to do to get the correct xerces version that can be used in combination with the xsd I installed ????

In windows that wasn't an issue since there the libraries and include files for xerces are included in the same xsd installer so there is always a combination that works together.

7)
So I also tried to build the xsd myself (see previous mail) to be sure that the same xerces version is used, but maybe that is not needed when I there are two binary installers (one for xsd and one for xerces that belongs to each other. In all cases I could never build a xerces shared library so that method for sure don't work.

Thanks,
Henk

-----Original Message-----
From: Boris Kolpackov [mailto:boris at codesynthesis.com] 
Sent: vrijdag 15 september 2017 13:59
To: Henderson, H.C. (Henk) <henk.henderson at tno.nl>
Cc: 'xsd-users at codesynthesis.com' <xsd-users at codesynthesis.com>; Berg, T.W. (Tom) van den <tom.vandenberg at tno.nl>
Subject: Re: [xsd-users] multiple definitions errors

Henderson, H.C. (Henk) <henk.henderson at tno.nl> writes:

> Error loading 
> /home/hendersonhc/Tools/eclipse_ws_cpp/LLBMLPlugin/Release
> /libLLBMLPlugin.so /home/hendersonhc/Tools/eclipse_ws_cpp/LLBMLPlugin/
> Release/libLLBMlPlugin.so: undefined symbol:
> _ZKN11xerces_3_213XMLAttDefList14isSerializableEv)

This kind of errors usually mean that you've built your library with one build/version of Xerces-C++ but the library is being picked up from a different build/version.

My suggestion would be to remove any custom builds (including from /usr/local), install the latest version from your distribution's packages, and use that.


> I have followed the build instructions:
> 
> http://www.codesynthesis.com/projects/xsd/extras/build-unix.xhtml

These instructions are for building the XSD compiler itself, not for building your application. I would suggest that you don't try this and instead use the pre-built XSD compiler binary from the download page.

Boris
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