= Building LIGO softwares for 64 bit linux =
----
== EPICS ==
Well this is not a LIGO software, but it is essential for a control room computer.

=== EPICS Base ===
Download the EPICS base package from http://www.aps.anl.gov/epics/base/index.php

Unpack it. Set/unset environmental variables.

{{{
setenv EPICS_HOST_ARCH linux-x86_64
unsetenv SCRIPTS
}}}

Compile

{{{
make
}}}

Install

{{{
cd ..
cp -r base-3.14.0 /cvs/cds/caltech/apps/linux64/epics/base
}}}

=== Extensions ===
Download the archive containing the extensions directory structure. http://www.aps.anl.gov/epics/download/extensions/extensionsTop_20070703.tar.gz

Unpack it to /cvs/cds/caltech/apps/linux64/epics/

Download necessary extensions (medm, ezca, etc).

Unpack it into /cvs/cds/caltech/apps/linux64/epics/extensions/src/

Move to the extracted directory and type {{{make}}} to compile the extension.

----
== Dataviewer ==
Check out source code from the CDS CVS repository (you need an account).

{{{
setenv CVSROOT :pserver:username@ldas-sw.ligo.caltech.edu:/ldcg_server/common/repository_cds
cvs login 
cvs checkout cds/project/daq/dv
cd dv
}}}

Compile

{{{
make
}}}

Copy the following files to /cvs/cds/caltech/apps/linux64/dataviewer/

{{{
Control/dc3
Display/framer4 
Display/frameMemRead
}}}

Create /cvs/cds/caltech/apps/linux64/dataviewer/dataviewer with the following contents.

{{{
#!/bin/sh
mkdir /tmp/$$DC
DVPATH=/cvs/cds/caltech/apps/linux64/dataviewer
export DVPATH
PATH=${PATH}:${DVPATH}:/cvs/cds/caltech/apps/linux64/grace/bin
export PATH
$DVPATH/dc3  -s fb40m -a $$  -b $DVPATH $*
/bin/rm -f -r /tmp/$$DC
}}}

----
== GDS software ==
Here is what I tried to get the build the GDS software. The compilation completes but dtt does not run.

First you have to install ROOT.

=== Installing ROOT ===
Download ROOT-5.20 from http://root.cern.ch/root/Version520.html

Expand the archive and run the configure script.

{{{
./configure linuxx8664gcc --prefix=/cvs/cds/caltech/apps/linux64/root
}}}

Build & install.

{{{
make
make install
}}}

=== Building GDS ===
Check out the GDS CVS tree.

{{{
setenv CVSROOT :pserver:readonly@ldas-sw.ligo.caltech.edu:/ldcg_server/common/repository_gds
cvs login 
m0n1t0r
cvs checkout gds
cd gds
}}}

Set environmental variables.

{{{
setenv   GDSBUILD online
setenv   ROOTSYS /cvs/cds/caltech/apps/linux64/root
}}}

Prepare the building environment.

{{{
./bootstrap
./configure --enable-dtt --enable-online --prefix=/cvs/cds/caltech/apps/linux64/gds
}}}

I had to tweak some Makefiles. First, I edited Monitors/Makefile and emptied SUBDIRS so that no monitor will be built. If you want to compile DMT monitors, you should not do this.

Next, I edited {{{DTT/src/Makefile}}} to add {{{$(epicslib)}}} at the end of the definition of {{{LDADD}}}.

The next step is to create libepics-linux.a (in DTT/lib) for 64bit linux. It turned out that this is just an archive file of object files from libca.a, libCom.a and libezca.a (all from epics). I took the following steps to create it.

{{{
mkdir libepics
cd libepics
ar x /cvs/cds/caltech/apps/linux64/epics/base/lib/linux-x86_64/libca.a
ar x /cvs/cds/caltech/apps/linux64/epics/base/lib/linux-x86_64/libCom.a
ar x /cvs/cds/caltech/apps/linux64/epics/extensions/lib/linux-x86_64/libezca.a
ar rcs libepics-linux.a *
}}}

Copy libepics-linux.a to DTT/lib overwriting the existing file.

Build and install

{{{
make
make install
}}}

Setup environmental variables for execution.

{{{
setenv   ROOTSYS /cvs/cds/caltech/apps/linux64/root
setenv   LD_LIBRARY_PATH ${ROOTSYS}/lib/root:/cvs/cds/caltech/apps/linux64/gds/lib:${LD_LIBRARY_PATH}
setenv   PATH /cvs/cds/caltech/apps/linux64/gds/bin:/cvs/cds/caltech/apps/linux64/gds/startup:${PATH}
}}}