configure

#!/bin/sh -f

# show_help exit_code
show_help() {
  cat << EOF
    usage: configure [options]

    Options:

     --help                   show this help and exit
     --prefix=DIR             installation prefix
     --bindir=DIR             use DIR instead of PREFIX/bin for executables
     --libdir=DIR             use DIR instead of PREFIX/lib for libraries
     --incdir=DIR             use DIR instead of PREFIX/include for headers
     --docdir=DIR             use DIR instead of PREFIX/share/doc/mdwf for docs
     --with-qmp=DIR           use DIR/bin/qmp-config to query QMP configuration
     --with-gsl=DIR         use DIR/bin/gsl-config to query GSL configuration
     --with-atlas=DIR       use ATLAS implementation of BLAS in DIR/lib
     --target=TARGET          build target architecture, see below

   Target architectures:

     cee-32                  K&R C on a 32-bit target
     cee-64                  K&R C on a 64-bit target
     c99-32                  ISO/IEC 9899 (aka C99) on a 32-bit target
     c99-64                  ISO/IEC 9899 (aka C99) on a 64-bit target
     bgl/xlc                 BG/L or BG/P with IBM XLC compiler
     bgq/xlc                 BG/Q with IBM XLC compiler

   Environment variables:
     CC                      C compiler to use
     CFLAGS                  Flags to pass to the compiler
     COPTS                   Options for the compiler
     LD                      Link editor to use
     LDFLAGS                 Flags to pass to the linker
     LIBS                    Extra libraries to use
     AR                      Library archiver
     RANLIB                  Library indexing tool
EOF
exit $1
}

# show_error arg ...
show_error() {
   echo "**** Configure error: $*" 1>&2
   exit 1
}

# configuration variables
prefix=
bindir=
libdir=
incdir=
docdir=

# defaults
default_prefix=/usr/local
# rest is relative to prefix by default
bindir_loc=bin
libdir_loc=lib
incdir_loc=include
docdir_loc=share/doc/mdwf
default_cc=gcc
default_cflags=""
default_copts="-Wall"
default_ld=gcc
default_ldflags=""
default_ar=ar
default_ranlib="echo RANLIB"

# process_args arg ...
process_args() {
  while [ $# -ne 0 ]; do
    case "$1" in
      --help)  show_help 0 ;;
      --prefix=*)       prefix=`echo "$1" | sed -e 's/--prefix=//'`   ;;
      --bindir=*)       bindir=`echo "$1" | sed -e 's/--bindir=//'`   ;;
      --libdir=*)       libdir=`echo "$1" | sed -e 's/--libdir=//'`   ;;
      --incdir=*)       incdir=`echo "$1" | sed -e 's/--incdir=//'`   ;;
      --docdir=*)       docdir=`echo "$1" | sed -e 's/--docdir=//'`   ;;
      --with-qmp=*)     qmp=`echo "$1" | sed -e 's/--with-qmp=//'`    ;;
      --with-gsl=*)     gsl=`echo "$1" | sed -e 's/--with-gsl=//'`     ;;
      --with-atlas=*)   atlas=`echo "$1" | sed -e 's/--with-atlas=//'` ;;
      # handle other CBLAS implementations here
      --target=*)       target=`echo "$1" | sed -e 's/--target=//'`   ;;
      *) show_error "Unknown argument $1" ;;
    esac
    shift
  done
}

# speciate_target
speciate_target() {
  case "$target" in
    cee-32)
       limpdir=cee-32
       default_cc="gcc -std=c99 -m32"
       default_cflags=""
       default_copts="-Wall -O3"
       default_ld="gcc -std=c99 -m32"
       default_ldflags=""
       default_libs=""
       default_ar="ar"
       default_ranlib="ranlib"
       ;;
    c99-32)
       limpdir=c99-32
       default_cc="gcc -std=c99 -m32"
       default_cflags=""
       default_copts="-Wall -O3"
       default_ld="gcc -std=c99 -m32"
       default_ldflags=""
       default_libs=""
       default_ar="ar"
       default_ranlib="ranlib"
       ;;
    cee-64)
       limpdir=cee-64
       default_cc="gcc -std=c99 -m64"
       default_cflags=""
       default_copts="-Wall -O3"
       default_ld="gcc -std=c99 -m64"
       default_ldflags=""
       default_libs=""
       default_ar="ar"
       default_ranlib="ranlib"
       ;;
    c99-64)
       limpdir=c99-64
       default_cc="gcc -std=c99 -m64"
       default_cflags=""
       default_copts="-Wall -O3"
       default_ld="gcc -std=c99 -m64"
       default_ldflags=""
       default_libs=""
       default_ar="ar"
       default_ranlib="ranlib"
       ;;
    bgl/xlc)
       limpdir=bgl-xlc
       default_cc="blrts_c99"
       default_cflags=""
       default_copts="-O3 -qarch=440d -qstrict"
       default_ld="blrts_c99"
       default_ldflags=""
       default_libs=""
       default_ar="powerpc-bgl-blrts-gnu-ar"
       default_ranlib="powerpc-bgl-blrts-gnu-ranlib"
       ;;
    bgp/xlc)
       limpdir=bgl-xlc
       default_cc="bgc99"
       default_cflags=""
       default_copts="-O3 -qarch=450d -qstrict"
       default_ld="bgc99"
       default_ldflags=""
       default_libs=""
       default_ar="ar"
       default_ranlib="ranlib"
       ;;
    bgq/xlc)
       limpdir=bgq-xlc
       default_cc="bgc99"
       default_cflags=""
       default_copts="-O3 -qstrict -qmaxmem=-1"
       default_ld="bgc99"
       default_ldflags=""
       default_libs=""
       default_ar="powerpc64-bgq-linux-ar"
       default_ranlib="powerpc64-bgq-linux-ranlib"
       ;;
    *) show_error "Unsupported target $target" ;;
  esac
}

# normalize
normalize() {
  prefix=${prefix:-$default_prefix}
  bindir=${bindir:-$prefix/$bindir_loc}
  libdir=${libdir:-$prefix/$libdir_loc}
  incdir=${incdir:-$prefix/$incdir_loc}
  docdir=${docdir:-$prefix/$docdir_loc}

  # target speciation
  speciate_target

  # flags and defaults
  cc="${CC:-$default_cc}"
  cflags="${CFLAGS:-$default_cflags}"
  copts="${COPTS:-$default_copts}"
  default_ld="${cc:-$default_ld}"
  ld="${LD:-$default_ld}"
  ldflags="${LDFLAGS:-$default_ldflags}"
  libs="${LIBS}"
  ar="${AR:-$default_ar}"
  ranlib="${RANLIB:-$default_ranlib}"
  [ -z "$target" ] && show_error "No target specified"
  [ -z "$qmp" ] && show_error "QMP must be explicitly specified"
  [ -x $qmp/bin/qmp-config ] || show_error "No qmp-config found in $qmp"
  qmp_cflags=`$qmp/bin/qmp-config --cflags`
  qmp_ldflags=`$qmp/bin/qmp-config --ldflags`
  qmp_libs=`$qmp/bin/qmp-config --libs`
  # optimized CBLAS library
  if [ ! -z "$atlas" ] ; then
      cblas_libs="-L$atlas/lib -lcblas"
  fi
  [ -x $gsl/bin/gsl-config ] || show_error "No gsl-config found in $gsl"
  gsl_cflags="-DHAVE_GSL `$gsl/bin/gsl-config --cflags`"
  if [ -z "$cblas_libs" ] ; then
      gsl_libs=`$gsl/bin/gsl-config --libs`
  else
      gsl_libs=`$gsl/bin/gsl-config --libs-without-cblas`
  fi
}

# show_config
show_config() {
   echo "MDWF configuration summary:"
   echo "====================================="
   echo "prefix                  $prefix"
   echo "binaries directory      $bindir"
   echo "libraries directory     $libdir"
   echo "headers directory       $incdir"
   echo "doc directory           $docdir"
   echo "C compiler              $cc"
   echo "Compiler flags          $cflags"
   echo "Compiler options        $copts"
   echo "Link editor             $ld"
   echo "Linking flags           $ldflags"
   echo "Extra libraries         $libs"
   echo "Archiver                $ar"
   echo "Ranlib                  $ranlib"
   echo "QMP location            $qmp"
   echo "GSL location            $gsl"
   # optimized CBLAS
   [ -z "$atlas" ] || echo "ATLAS location          $atlas"
   echo "Build target            $target"
   echo "====================================="
}

# build_config input output
build() {
  sed < $1 \
      -e "s|@bindir@|$bindir|g" \
      -e "s|@libdir@|$libdir|g" \
      -e "s|@incdir@|$incdir|g" \
      -e "s|@docdir@|$docdir|g" \
      -e "s|@cc@|$cc|g" \
      -e "s|@cflags@|$cflags|g" \
      -e "s|@copts@|$copts|g" \
      -e "s|@ld@|$ld|g" \
      -e "s|@ldflags@|$ldflags|g" \
      -e "s|@libs@|$libs|g" \
      -e "s|@ar@|$ar|g" \
      -e "s|@ranlib@|$ranlib|g" \
      -e "s|@qmp@|$qmp|g" \
      -e "s|@qmp_cflags@|$qmp_cflags|g" \
      -e "s|@qmp_ldflags@|$qmp_ldflags|g" \
      -e "s|@qmp_libs@|$qmp_libs|g" \
      -e "s|@target@|$target|g" \
      -e "s|@limpdir@|$limpdir|g" \
 | sed -e "s|@gsl@|$gsl|g" \
       -e "s|@gsl_cflags@|$gsl_cflags|g" \
       -e "s|@gsl_libs@|$gsl_libs|g" \
       -e "s|@cblas_libs@|$cblas_libs|g" \
      > $2 \
|| show_error "Could not generate $2"
}

######

if [ $# -eq 0 ]; then
  show_help 1
fi

process_args $*
normalize
build mdwf-config.in mdwf-config
chmod +x mdwf-config
build Makefile.in Makefile
build target.in target
build samples/Makefile.in samples/Makefile
show_config
show_config > config.log