Software/Geant4/Installation/Xerces-C

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Contents

Introduction

Xerces-C++ is a validating XML parser written in a portable subset of C++. Xerces-C++ makes it easy to give your application the ability to read and write XML data.

Geant4 requires the Xerces-C++ headers and libraries compiled against the C++11 standard in order to provide support for GDML geometry descriptions.

Details

Website 
http://xerces.apache.org/xerces-c/
Source URL 
http://www.apache.org/dist/xerces/c/3/sources/
Installed Production version 
3.1.3 (17 Feb 2016)
Source code 
src/geant4-prerequisites/xerces-c/xerces-c-3.1.3.tar.gz
Installed Development version 
3.2.0 (20 October 2017)
Central Repository 
https://github.com/apache/xerces-c

Installation Notes

The Xerces-C++ website provides some useful instructions on Building and Installing Xerces-C++.

For installation, Xerces-C++ does not support installation into a sandbox directory (i.e. there are no options prefix or DESTDIR defined for command make install) and must be given the installation directory with the -prefix option. As such, to recompile Xerces-C++ for different target directories, the configure script must be rerun with a modified -prefix /path/to/dest option. This has to be managed manually as can be seen in the installation commands below.

Installation

When downloading software, the downloaded tarball (or other Zip archive) should be placed in an appropriately named directory in /unix/pbt/software/src: the instructions below assume that the directory is /unix/pbt/software/src/geant4-prerequisites/xerces-c.

The source code should then be extracted into a suitable subdirectory in /unix/pbt/software/build. The extracted source code directory can only be deleted once the software has been built and installed.

Installation from Central Repository

After the latest version has been pulled from its central repository and placed within /unix/pbt/software/src/xerces-c, create a build directory within the PBT software directory from which you can compile the code:

cd /unix/pbt/software/build/
mkdir xerces-c
cd xerces-c

CMake can then be used to configure and install Xerces-C.

cmake ../../src/xerces-c
ccmake .

The command ccmake . opens an interactive GUI that can be used to specify installation options. From within this you can define your installation directory and configure any other options as required. On the PBT cluster it is required that the software is installed to the development directory, and so the CMAKE_INSTALL_PREFIX is defined as follows:

CMAKE_INSTALL_PREFIX       /unix/pbt/software/dev/xerces-c-3.2
  • c to configure
  • g to generate and exit

The software can then be installed using the usual commands:

make 
make install

Installation from source code

Source Code Extraction

cd /unix/pbt/software/src/geant4-prerequisites/xerces-c
tar -xvz -f xerces-c-3.1.3.tar.gz

Build And Install

It is possible to build for the Production environment without deleting the Xerces-C build directory created for the Development installation, meaning that significant time is saved when running make. However, it isn't recommended to do so as the Production installation ends up referencing components within /unix/pbt/software/dev which is not desirable as the two environments are no longer independent. As such, these instructions assume one is building from scratch for each environment: to do so, make sure that the build/qt directory is deleted before recreating it for the subsequent build and install.

Also, although it is possible to install straight to the Production environment, it is highly discouraged to do so without first compiling a Development version.

Development Environment
cd /unix/pbt/software/build
mkdir -pv xerces-c/xerces-c-3.1.3
cd xerces-c/xerces-c-3.1.3
../../../src/geant4-prerequisites/xerces-c/xerces-c/configure --prefix /unix/pbt/software/dev/xerces-c-3.1.3
make
make install
Production Environment
cd /unix/pbt/software/build
mkdir -pv xerces-c/xerces-c-3.1.3
cd xerces-c/xerces-c-3.1.3
../../../src/geant4-prerequisites/xerces-c/xerces-c/configure --prefix /unix/pbt/software/prod-sl6
make
make install
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