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Compiling CMSSW code on 64-bit Opterons

by Aaron Dominguez — last modified 2006-05-10 05:21

I finally figured out how to compile CMS code (in CMSSW) on our 64-bit cluster, red.unl.edu. Previously, this wasn't possible; we could only RUN CMSSW applications on red, not compile. Compiling always had to be performed on native 32-bit nodes. Thanks to some help from Thomas Speer, this can now be done!

The solution is a bit hacky right now, but at least it is a solution. Other Tier-2 users might be interested in this though. What you need to do is the following two steps:

Check out and setup your CMSSW area:

scramv1 project CMSSW CMSSW_0_6_0
cd CMSSW_0_6_0/src
cvs co WhateverPackageYouWantToCompile

Then you need to replace a magic file used by SCRAM. Replace the file in your CMSSW_0_6_0/config/BuildFile with the stuff below:

# -*-toolbox-*-

CXXFLAGS := -m32 -Wa,--32 -pthread
LDFLAGS:=-m32
MODULEFLAGS:=-m32
CSharedFlags:=-m32
CXXSharedFlags:=-m32 -Wa,--32 -pthread

<Architecture name=slc3_ia32_gcc323>
<Flags CXXFLAGS="-m32 -Wa,--32 -pthread">
<Flags LDFLAGS="-m32">
<Flags MODULEFLAGS="-m32">
<Flags CSharedFlags="-m32">
<Flags CXXSharedFlags="-m32 -Wa,--32 -pthread">
<Flags CXXSHAREDOBJECTFLAGS="-m32 -Wa,--32 -pthread">
<makefile>
F77compiler:=g77
CCcompiler:=gcc3
CXXFLAGS:=-m32
LDFLAGS:=-m32
MODULEFLAGS:=-m32
CSharedFlags:=-m32
CXXSharedFlags:=-m32
</makefile>
</Architecture>

<Architecture name=slc3_amd64_gcc323>
<makefile>
F77compiler:=g77
CCcompiler:=gcc3
CXXFLAGS:=-m32
LDFLAGS:=-m32
MODULEFLAGS:=-m32
CSharedFlags:=-m32
CXXSharedFlags:=-m32
</makefile>
</Architecture>

<Architecture name=slc3_ia32_gcc323_dbg>
<Flags CXXFLAGS="-O0 -g -DDEBUG">
<makefile>
F77compiler:=g77
CCcompiler:=gcc3
CXXFLAGS:=$(patsubst -O2,,$(CXXFLAGS))
CXXFLAGS:=-m32
LDFLAGS:=-m32
MODULEFLAGS:=-m32
CSharedFlags:=-m32
CXXSharedFlags:=-m32
</makefile>
</Architecture>

<Architecture name=slc3_ia32_gcc344>
<makefile>
F77compiler:=g77
CCcompiler:=gcc3
</makefile>
</Architecture>

<Architecture name=slc3_ia32_gcc344_dbg>
<Flags CXXFLAGS="-O0 -g -DDEBUG">
<makefile>
F77compiler:=g77
CCcompiler:=gcc3
CXXFLAGS := $(patsubst -O2,,$(CXXFLAGS))
</makefile>
</Architecture>

# Storage locations:
<ProductStore name=lib type=arch swap=true>
<ProductStore name=bin type=arch swap=true>
<ProductStore name=test type=arch swap=true>
<ProductStore name=logs type=arch swap=true>
<ProductStore name=doc>
<ProductStore name=module type=arch swap=true>

# ClassPaths:
<ClassPath path=+Project/+SubSystem/+Package/scripts+scripts>
<ClassPath path=+Project/Documentation+Documentation/+doc>
<ClassPath path=+Project/+SubSystem/+Package/src+library>
<ClassPath path=+Project/+SubSystem/+Package/bin+binary>
<ClassPath path=+Project/+SubSystem/+Package/test+test>
<ClassPath path=+Project/+SubSystem/+Package/data+data_install>

# Add use for SCRAM-managed projects we're going to use 
# (this ensures that we end up with LIBDIR and INCLUDE from each):
<use name=lcgaa>
<use name=coral>
<use name=pool>
<use name=seal>

# Choose a compiler:
<use name=cxxcompiler>

Then you need to tell SCRAM to reset its caches and compile your code:
```
cd ~/CMSSW_0_6_0/src
scramv1 b -r
```

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Compiling CMSSW code on 64-bit Opterons