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Files must be shared between packages as much as possible. Compiler independent parts, such as data files in `+%{_datadir}/%{name}+` and man files MUST be put into a `+-common+` subpackage that is required by all of the binary packages (the serial package and all of the MPI packages).
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A sample spec file
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# Define a macro for calling ../configure instead of ./configure
%global dconfigure %(printf %%s '%configure' | sed 's!\./configure!../configure!g')
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Name: foo
Requires: %{name}-common = %{version}-%{release}
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%package common
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%package openmpi
BuildRequires: openmpi-devel
# Require explicitly for dir ownership and to guarantee the pickup of the right runtime
Requires: openmpi
Requires: %{name}-common = %{version}-%{release}
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%package mpich
BuildRequires: mpich-devel
# Require explicitly for dir ownership and to guarantee the pickup of the right runtime
Requires: mpich
Requires: %{name}-common = %{version}-%{release}
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%build
# Have to do off-root builds to be able to build many versions at once
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# To avoid replicated code define a build macro
%define dobuild() \
mkdir $MPI_COMPILER; \
cd $MPI_COMPILER; \
%dconfigure --program-suffix=$MPI_SUFFIX ;\
make %{?_smp_mflags} ; \
cd ..
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# Build serial version, dummy arguments
MPI_COMPILER=serial MPI_SUFFIX= %dobuild
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# Build parallel versions: set compiler variables to MPI wrappers
export CC=mpicc
export CXX=mpicxx
export FC=mpif90
export F77=mpif77
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# Build OpenMPI version
%{_openmpi_load}
%dobuild
%{_openmpi_unload}
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# Build mpich version
%{_mpich_load}
%dobuild
%{_mpich_unload}
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%install
# Install serial version
make -C serial install DESTDIR=%{buildroot} INSTALL="install -p" CPPROG="cp -p"
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# Install OpenMPI version
%{_openmpi_load}
make -C $MPI_COMPILER install DESTDIR=%{buildroot} INSTALL="install -p" CPPROG="cp -p"
%{_openmpi_unload}
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# Install MPICH version
%{_mpich_load}
make -C $MPI_COMPILER install DESTDIR=%{buildroot} INSTALL="install -p" CPPROG="cp -p"
%{_mpich_unload}
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%files # All the serial (normal) binaries
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%files common # All files shared between the serial and different MPI versions
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%files openmpi # All openmpi linked files
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%files mpich # All mpich linked files
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