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%% File: Examples.tex
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%%____________________________________________________________________
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%%
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%% Author: Shaun ASHBY <Shaun.Ashby@cern.ch>
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%% Update: 2005-11-02 17:08:52+0100
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%% Revision: $Id$
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%%
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%% Copyright: 2005 (C) Shaun ASHBY
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%%
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%%--------------------------------------------------------------------
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\chapter{Examples}\label{ch:examples}
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\section{Configuring New Projects}\label{sec:configuringprojectexample}
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\subsection{Creating Standalone Projects}\label{sec:configuringstandaloneprojects}
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\section{BuildSystem and Configuration Tips And Tricks}
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Examples of useful tips? For configuration, could mention changes to \texttt{Self}.
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\paragraph{Using Project ClassPaths to Customise the Build System}
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Describe a proper ClassPath.
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\paragraph{Redefining An Existing Tool}
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Currently it is not possible to have multiple versions of the same
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tool. Therefore, this recipe should be followed if an installed tool
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should be modified, for example to redefine the libraries used or to
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add an extra runtime variable definition.
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- Create a new template using \scram, or copy the installed version
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from \texttt{.SCRAM/architecture/InstalledTools}. If you cannot see
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the \texttt{InstalledTools} directory (which sometimes happens for
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%% FIXME>> Should this be ``scram set'' or will ``scram setup <tool>'' work?
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developer areas), type \texttt{scram setup} or copy the tool description file
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from the release area for the version of the project you're using to
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the project area.
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Next, edit this version of the tool file.
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Delete the installed version by running \texttt{scram tool remove <tool>}.
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Set up the new version of the tool, giving a \texttt{file:} URL to
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point to your new tool description file.
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\paragraph{Creating an executable}
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How to create a binary executable.
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\paragraph{Creating a test executable}
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How to create a test binary executable. How is this different to a
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normal binary? Different template defines custom behaviour, in this
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case to move the product to a \texttt{test} storage location and
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defining rules for executing the test.
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\paragraph{Changing the default name of a package library}
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The CMSSW example. Demonstrate how to change the name of the target,
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taking the path information from the standard template for the library.
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\paragraph{Creating an extra shared library}
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How to use the \texttt{extra\_library.tmpl} template. Types of globs
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to pick up source files from a stubs directory, for example.
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\paragraph{How to create a debug version of something}
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Basically by adding $<$flags \texttt{CXXFLAGS}=\texttt{-g -O0}$>$ to
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the \buildfile. Easy.
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\subsection{How To Avoid Rebuilding}
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Info here on creating a private ``release'' area from which to create
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a developer area.
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\example{Example} An example of the contents of a bootstrap file for
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a project is shown below. \index{example bootstrap file}
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%\footnotesize{\begin{verbatim}
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%<doc type=Configuration::BootStrapProject version=1.0>
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%<project name=P version=P_1_0>
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%<base url="cvs://server.cern.ch?auth=pserver&user=anoncvs&passkey=Ah<Z&version=TAG">
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%<download url="cvs:?module=SCRAMToolBox/configs" name=config/site>
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%</base>
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%
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%*************************************************************
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%
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%<Config dir=config>
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%<base url="cvs://server.cern.ch/cvs/SEAL?auth= \
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%pserver&user=anoncvs&passkey=Ah<Z&version=SEAL_1_1_0">
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%<download url="cvs:?module=scram" name="config">
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%<RequirementsDoc name=config/RequirementsDoc>
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%</base>
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%</project>
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%\end{verbatim}}\normalsize
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\ni This bootstrap file instructs \scram to create a project area
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called \texttt{P\_1\_0}. Inside this area there is a
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directory called \texttt{config} (the configuration directory)
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where all project configuration files are stored. All source code
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for the project is downloaded to a directory called
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\texttt{src}. Once the configuration files have been downloaded,
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\scram parses the requirements file \texttt{RequirementsDoc},
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found in the \texttt{config} directory.
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\example{Example} Here is part of the requirements file for the
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\texttt{COBRA} project example used above:\index{example requirements file}
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%% \footnotesize{\begin{verbatim}
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%% <doc type=BuildSystem::Requirements version=2.0>
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%% <baseurl="cvs://cmscvs.cern.ch/cvs_server/repositories/ToolBox?auth=\
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%% pserver&user=anonymous&passkey=AA_:yZZ3e&version=CMS_53_1">
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%% <include url="cvs:?module=ToolBox/CMS/Configuration/CMSconfiguration">
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%% <Architecture name=SunOS__5>
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%% <select name=CC>
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%% </Architecture>
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%% <Architecture name=Linux__2>
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%% <select name=gcc>
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%% </Architecture>
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%% <select name=clhep>
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%% <select name=htl>
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%% <select name=qt>
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%% </base>
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%% \end{verbatim}}\normalsize
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%% \ni The base URL is set to point to a CVS repository for the
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%% toolbox. The version of the toolbox to be used has the CVS
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%% symbolic tag \texttt{CMS\_53\_1} according to local
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%% conventions.The configuration file \texttt{CMSconfiguration} is
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%% included using an \lbkt\texttt{include}\rbkt statement. This file
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%% contains entries like these\index{example using the \texttt{include} directive}
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%% \footnotesize{\begin{verbatim}
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%% <Architecture name=SunOS__5>
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%% <require name=CC version=5.2 url="cvs:?module=ToolBox/CompilerTools/CXX/SunCC">
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%% </require>
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%% </Architecture>
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%% <Architecture name=Linux__2>
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%% <require name=cxxcompiler version=2.95.2 url="cvs:?module=ToolBox/CompilerTools/CXX/gcc">
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%% </require>
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%% </Architecture>
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%% <require name=Qt version=3.0.1 url="cvs:?module=ToolBox/LHCxx/Qt">
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%% </require>
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%% <require name=CLHEP version=1.7.5.0 url="cvs:?module=ToolBox/LHCxx/CLHEP">
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%% </require>
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%% <require name=HTL version=1.3.2.1 url="cvs:?module=ToolBox/LHCxx/HTL">
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%% </require>
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%% \end{verbatim}}\normalsize
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\ni which are parsed directly after the file is downloaded,
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\ie the behaviour is exactly the same as if the
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\lbkt\texttt{require}\rbkt statements are written in the
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requirements file itself. The compiler tool document wraps the
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architecture-specific information within the document itself so that
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it is only necessary to have \lbkt\texttt{use} name=\texttt{cxxcompiler}\rbkt
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declared in the project \texttt{BuildFile} to use the specified
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compiler. If no compiler is declared like this, the native
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\texttt{g++/gcc} will be used instead.
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%Notice that the compilers are
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%enclosed within architecture specific blocks-- more details
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%concerning compiler support can be found in Section~\ref{sec:compilersupport}.
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\example{Example} Here is an example of a \texttt{ToolDoc} for a tool
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called \texttt{CLHEP}: \index{\texttt{ToolDoc}!example}
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%% \footnotesize{\begin{verbatim}
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%% <doc type=BuildSystem::ToolDoc version=1.0>
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%% <Tool name=CLHEP version=1.7.5.0>
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%% <info url=http://wwwinfo.cern.ch/asd/lhc++/clhep></info>
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%% <LIB name=CLHEP>
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%% <Client>
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%% <Environment name=CLHEP_BASE>
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%% The top of the standard CLHEP distribution.
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%% </Environment>
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%% <Environment name=LIBDIR default="$CLHEP_BASE/lib" type=lib>
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%% The Library location for the CLHEP distribution
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%% </Environment>
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%% <Environment name=INCLUDE default="$CLHEP_BASE/include">
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%% The header file location for the CLHEP distribution
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%% </Environment>
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%% </Client>
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%% <Environment name=LD_LIBRARY_PATH value="$LIBDIR" type=Runtime_path>
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%% </Environment>
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%% </Tool>
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%% \end{verbatim}}\normalsize
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%% %$
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\ni When this \texttt{ToolDoc} is parsed by \scram,
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\texttt{CLHEP\_BASE} is set by the configuration manager
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(either automatically or by prompting the user if necessary), both
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\texttt{LIBDIR} and \texttt{INCLUDE} are set to the default
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values if these paths are found to be valid and, at runtime, the
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value of the path \texttt{\$LIBDIR} is appended to the user
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shell variable \texttt{\$LD\_LIBRARY\_PATH} if it exists
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(otherwise, it is defined automatically).
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\ni Here area several examples illustrating how to use the \texttt{scram setup} command.
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\example{Example A} We want to add to our area an analysis tool called \texttt{ROOT}.
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This tool is included in the tagged configuration available to all projects, so the
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setup command to use in this case is--
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\small{\begin{verbatim}
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scram setup [-i] root 3.05.03 \
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'cvs://lcgapp.cern.ch/cvs/SPITOOLS? \
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auth=pserver&module=SCRAMToolBox/General/ROOT \
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&passkey=Ah<Z&user=anonymous&version=LCG_06'
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\end{verbatim}}\normalsize
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\example{Example B} We want to add the tool \texttt{ruby}
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to our project area. This is not a regularly used tool (that is, the tool is not contained in
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the configuration), so we will add it using a local tool
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description file. The command is
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\begin{scramcmd}{setup}
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\flag{-i}~\marg{ruby}~\marg{1.6.7}~\marg{file:./ruby-1.6.7}
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\end{scramcmd}
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\ni The tool description file looks like this:
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\footnotesize{
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\begin{verbatim}
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<doc type=BuildSystem::ToolDoc version=1.0>
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<Tool name=RUBY version=1.6.7>
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<Client>
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<Environment name=RUBY_BASE>
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The top of the Ruby distribution.
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</Environment>
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<Environment name=LIBDIR default=$RUBY_BASE/lib/ruby/1.6 type=lib>
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</Environment>
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</Client>
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<Environment name=PATH value="$RUBY_BASE/bin" type=Runtime_path>
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</Environment>
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<Environment name=LD_LIBRARY_PATH value=$LIBDIR type=Runtime_path>
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</Environment>
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</Tool>
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\end{verbatim}
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}\normalsize
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%$
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\ni so the interactive setup mechanism will ask for a value for
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\texttt{RUBY\_BASE} and the other values will be set automatically.
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\example{ClassPath Example} Following the recommended project
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structure conventions, here is an
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example of \lbkt\texttt{ClassPath}\rbkt settings for a project:
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\index{\texttt{ClassPath} tag!example}
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%% \small{\begin{verbatim}
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%% <ClassPath path=+Project/+SubSystem/+Package/src+library>
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%% <ClassPath path=+Project/+SubSystem/+Package/test+UnitTest>
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%% <ClassPath path=+Project/+SubSystem/+Package/application+binaryApp>
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%% \end{verbatim}}\normalsize
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\index{structure templates! and the \texttt{ClassPath}}
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\ni These settings will associate the top-level \texttt{src}
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directory with \texttt{Project\_template.tmpl} and any directory in the next
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level with the template \texttt{SubSystem\_template.tmpl}.
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The level below that will be associated with \texttt{Package\_template.tmpl}.
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The last elements have a pattern-matching string before the \texttt{+}
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sign: only directories matching the names \texttt{src},
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\texttt{test} and \texttt{application} at the third level below
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the top-level \texttt{src} directory will be mapped to the
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templates \texttt{library\_template.tmpl},
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\texttt{UnitTest\_template.tmpl} and
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\texttt{binaryApp\_template.tmpl} respectively. Thus, any
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source files in a directory \texttt{src} at package-level will
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source the template \texttt{library\_template.tmpl} for build
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rules to build a library. Likewise, binary applications will be
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built from sources located in any directory called
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\texttt{application} using a template
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\texttt{binaryApp\_template.tmpl}.
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\example{ProductStore Example} To create separate \texttt{include},
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\texttt{bin} and \texttt{lib} subdirectories, all of which are
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architecture-dependent, the following tags would be added to the project \texttt{BuildFile}:
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\index{\texttt{ProductStore} tag!example}
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%% \small{\begin{verbatim}
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%% <ProductStore name=include type=arch></ProductStore>
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%% <ProductStore name=lib type=arch></ProductStore>
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%% <ProductStore name=bin type=arch></ProductStore>
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%% <ProductStore name=module type=arch swap=t></ProductStore>
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%% \end{verbatim}}\normalsize
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\ni In the above example, the storage location for modules is architecture-dependent and is
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created as \texttt{module/rh73\_gcc32} on a system with a \scram
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architecture \texttt{rh73\_gcc32}. The other directories
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(\texttt{bin}, \texttt{lib} and \texttt{include}) are created under a
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directory \texttt{rh73\_gcc32} in the project area.
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\ni Here are two examples of how the tag might be used.
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\index{using external libraries!example}
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\example{Example 1} Working in a local area, you want to link against
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the X11 libraries. Firstly, X11 must be an external tool that is
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available in your project configuration. You can check this by seeing
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if X11 is listed when you run \texttt{scram tool list}. Then just add
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the line
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\begin{tagprint}
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\lbkt\texttt{external} ref=\texttt{X11}\rbkt
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\end{tagprint}
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\ni to your \texttt{BuildFile} to use the X11 libraries.
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\example{Example 2} You are developing code which is dependent on
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another \textsc{scram}-managed project called \texttt{fooproject}.
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Following the previous example would result in all of the project
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libraries being used. However, if libraries belonging to one
|
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particular subsystem are required, and only these libraries, the line
|
| 317 |
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|
| 318 |
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\begin{tagprint}
|
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\lbkt\texttt{external} ref=\texttt{fooproject} use=\texttt{barsub}\rbkt
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\end{tagprint}
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|
| 322 |
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\ni will select only the subsystem \texttt{barsub}.
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|
| 324 |
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\example{Example Binary BuildFile} Here is an example of a
|
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\texttt{BuildFile} to build two binary executables:
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|
| 327 |
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\small{\begin{verbatim}
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<environment>
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<Group name=SimReader>
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<Use name=CARF>
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<bin file=testSimReader.cpp>SimReader test executable</bin>
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<bin file=testObserver.cpp>Observer test executable</bin>
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</environment>
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\end{verbatim}}\normalsize
|
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|
| 336 |
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\ni The object files for both binaries are linked against the
|
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libraries provided by group \texttt{SimReader} which is defined in the
|
| 338 |
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\texttt{CARF} subsystem \texttt{BuildFile} to produce the executables.
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|
|
| 340 |
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|
\example{Example Module BuildFile} This example will build
|
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two separate modules:
|
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|
|
| 343 |
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\small{\begin{verbatim}
|
| 344 |
|
|
<environment>
|
| 345 |
|
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<Group name=BaseUtilities>
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| 346 |
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<Use name=Utilities>
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| 347 |
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<module file=BaseUtilitiesModule.cpp>Base utilities plug-in</module>
|
| 348 |
|
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</environment>
|
| 349 |
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|
|
| 350 |
|
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<environment>
|
| 351 |
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<Group name=Persistency>
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| 352 |
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<Use name=Utilities>
|
| 353 |
|
|
<module file=PersistencyModule.cpp>Persistency layer</module>
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|
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</environment>
|
| 355 |
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|
\end{verbatim}}\normalsize
|
| 356 |
|
|
|
| 357 |
|
|
\example{Adding a New Rule} Suppose that for a package called
|
| 358 |
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|
\texttt{myPackage}, some additional library should be built in
|
| 359 |
|
|
addition to the default library \texttt{libmyPackage.so}.
|
| 360 |
|
|
The typical \tagstart{ClassPath} entry to build a library looks like
|
| 361 |
|
|
this
|
| 362 |
|
|
%% \small{\begin{verbatim}
|
| 363 |
|
|
%% <ClassPath path=+Project/myPackage+Package/src+library>
|
| 364 |
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|
%% \end{verbatim}}\normalsize
|
| 365 |
|
|
%% \ni and this uses a makefile called \texttt{library\_makefile.tmpl}.
|
| 366 |
|
|
%% At the top of this makefile there exists a statement for the default
|
| 367 |
|
|
%% build, namely,
|
| 368 |
|
|
%% \small{\begin{verbatim}
|
| 369 |
|
|
%% # Package Context Defaults
|
| 370 |
|
|
%% library : lib
|
| 371 |
|
|
%% \end{verbatim}}\normalsize
|
| 372 |
|
|
%% \ni A new build rule called \texttt{customlib} can be defined in the
|
| 373 |
|
|
%% structure makefile: if it is added above, it will be run by default
|
| 374 |
|
|
%% when building \textit{any} library.
|
| 375 |
|
|
%% For this action to take place only for the package \texttt{myPackage},
|
| 376 |
|
|
%% it is best to create a new structure makefile with a different name,
|
| 377 |
|
|
%% say \texttt{myCustomlib\_makefile.tmpl}, in which the new rule is
|
| 378 |
|
|
%% defined. Now the statement in \texttt{myCustomlib\_makefile.tmpl}
|
| 379 |
|
|
%% for the default build looks like this
|
| 380 |
|
|
|
| 381 |
|
|
%% \small{\begin{verbatim}
|
| 382 |
|
|
%% # Package Context Defaults
|
| 383 |
|
|
%% myCustomlib : lib customlib
|
| 384 |
|
|
%% \end{verbatim}}\normalsize
|
| 385 |
|
|
|
| 386 |
|
|
%% \ni and the corresponding \tagstart{ClassPath}
|
| 387 |
|
|
|
| 388 |
|
|
%% \small{\begin{verbatim}
|
| 389 |
|
|
%% <ClassPath path=+Project/myPackage+Package/src+myCustomlib>
|
| 390 |
|
|
%% \end{verbatim}}\normalsize
|
| 391 |
|
|
|
| 392 |
|
|
\ni will ensure that the new rule is used when building in the
|
| 393 |
|
|
\texttt{src/myPackage} directory.
|
| 394 |
|
|
|
| 395 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
| 396 |
|
|
|
| 397 |
|
|
%%% Local Variables:
|
| 398 |
|
|
%%% mode: latex
|
| 399 |
|
|
%%% TeX-master: "SCRAM-manual"
|
| 400 |
|
|
%%% End:
|
| 401 |
|
|
|
| 402 |
|
|
%%____________________________________________________________________
|
| 403 |
|
|
%% End of Examples.tex
|
| 404 |
|
|
%%____________________________________________________________________
|
| 405 |
|
|
%%
|
