Introduction

Below is some more detailed/advanced information about the offline build system. The offline build system is based on SCons. It is implemented as a set of scripts that import functionality from SConsTools (software developed internally). SConsTools introduces a package and release structure to support the build process.  The top level directory is for the release and contains the SConstruct file. Each package is in a sub-directory to the release.  Packages have a SConscript file. The structure of a release directory is explained in this page about Packages and Releases. SConsTools has a number of features including:

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release/include
release/build
release/arch

You may also see

release/data
release/web

depending on the packages being built. These directories belong to the build system - you should never put anything in these directories. They will be rebuilt each time scons runs if need be.
In release/include you will find two links to the package include directories:

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In the arch directory, you will find all the executables, scripts, libaries libraries (built as shared object libraries) and python modules for each package.

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Most packages require no additional options beyond those in the default configuration. If a package requires additional build options, these can often be added by calling the standardSConscript() function in the SConscript file in the package directory. For instance, suppose a psana - Original Documentation user is developing a module in a package called MyPackage which needs to use functions from the Gnu Scientific Library. They would add the following line:

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To upgrade the version of a release, see Typical Common development tasks.

Presentations

Below are slides from a talk given during the 2014 LCSL users meeting that covers the release/package structure of SConsTools, as well as how psana modules: Software_Development_Environment.pdf