configure

#!/bin/sh

print_help()
{
  echo 'Usage: configure [options]'
  echo ''
  echo 'where options may be any of the following:'
  echo ''
  echo ' --nowrf             Disables checks to find the path to the compiled WRF model.'
  echo '                     This enables some WPS programs to be compiled without'
  echo '                     requiring WRF to have been compiled, but it will preclude'
  echo '                     the compilation of WPS programs that depend on the WRF I/O'
  echo '                     API (geogrid, metgrid, and int2nc).'
  echo ''
  echo ' --build-grib2-libs  Compiles zlib, libpng, and JasPer libraries from source in'
  echo '                     the external/ directory, and installs the libraries in'
  echo '                     grib2/.'
  echo ''
  echo ' -h/--help           Print this help message and quit.'
}

#
# Check for command-line arguments
# At present, the only supported arguments are:
#     --nowrf : disables checks to find the path to the compiled WRF model
#     --build-grib2-libs : compiles zlib, libpng, and JasPer libraries from
#                          source in the external/ directory and installs
#                          the libraries in grib2/
#
nowrf=0
build_grib2=0
for arg in $@; do
  if [ "${arg}" = "--nowrf" ]; then
    nowrf=1
  elif [ "${arg}" = "--build-grib2-libs" ]; then
    build_grib2=1
  elif [ "${arg}" = "--help" ] || [ "${arg}" = "-h" ]; then
    print_help
    exit
  else
    printf "Unrecognized option %s\n" ${arg}
  fi
done


# Look for netcdf
if test -z "$NETCDF" ; then
  for p in /usr/local/netcdf
  do
    if test -d $p ; then
      NETCDF=$p
      break
    fi
  done
fi

if  test -z "$NETCDF"  ; then
 
  if [ `hostname | cut -c 1-2` = "bs" -o \
       `hostname | cut -c 1-2` = "bv" -o \
       `hostname` = "tempest" -o `hostname` = "lightning" ] ; then
    echo 'Compiling on an NCAR system with weird paths to NetCDF'
    echo 'Setting up a local NetCDF directory with symlinks'
    if ( test -d ./netcdf_links ) ; then
      echo 'A directory ./netcdf_links already exists. Continuing.'
    else
      mkdir ./netcdf_links
      if [ -z "$OBJECT_MODE" ] ; then
         OBJECT_MODE=32 
         export OBJECT_MODE
      fi
      if [ $OBJECT_MODE -ne 64 -a \( `hostname | cut -c 1-2` = "bs" \) ] ; then
        ( cd ./netcdf_links ; ln -s /usr/local/lib32/r4i4 ./lib ; \
                              ln -s /usr/local/include ./include )
      else
        ( cd ./netcdf_links ; ln -s /usr/local/lib64/r4i4 ./lib ; \
                              ln -s /usr/local/include ./include )
      fi
    fi
    NETCDF=`pwd`/netcdf_links
    export NETCDF


  else
    bedone=""
    if [ -d ./netcdf_links ] ; then
      echo '** There is an existing ./netcdf_links file. Should I use? [y]'
      read resp
      if [ "$resp" = "y" ] ; then
        NETCDF=`pwd`/netcdf_links
        bedone="yes"
      else
        echo 'Removing existing ./netcdf_links directory'
        /bin/rm -fr ./netcdf_links
      fi
    else
      echo '** WARNING: No path to NETCDF and environment variable NETCDF not set.'
      echo '** would you like me to try to fix? [y]'
    fi
    netcdfipath=""
    netcdflpath=""
    while [ -z "$bedone" ] ; do 
      read resp
      if [ "$resp" = "y" -o -z "$resp" ]  ; then
        if [ -d ./netcdf_links ] ; then
          echo 'There is already a ./netcdf_links directory. Okay to use links'
          echo 'in this directory for NetCDF include and lib dirs? [y]'
          read resp
          if [ "$resp" = "y" ] ; then
            NETCDF=`pwd`/netcdf_links
            export NETCDF
            bedone="yes"
            continue
          fi
        fi
        if [ -z "$netcdfipath" ] ; then
          echo 'Enter full path to NetCDF include directory on your system'
          read resp
          if [ ! -d "$resp" ] ; then
            echo "invalid path: $resp. Try again? [y]" ; continue
          fi
          netcdfipath=$resp
        fi
        if  [ -z "$netcdflpath" ] ; then
          echo 'Enter full path to NetCDF library directory on your system'
          read resp
          if [ ! -d "$resp" ] ; then
            echo "invalid path: $resp. Try again? [y]" ; continue
          fi
          netcdflpath=$resp
        fi

        if [ -n "$netcdflpath" -a -n "$netcdfipath" ] ; then
          if [ -d ./netcdf_links ] ; then
            echo 'Existing ./netcdf_links directory. Okay to remove. [y]'
            read resp
            if [ "$resp" = "y" ]  ; then
              /bin/rm -fr ./netcdf_links
            fi
          fi
          mkdir ./netcdf_links
          cd ./netcdf_links 
            ln -s "$netcdfipath" include
            ln -s "$netcdflpath" lib
          cd ..
          echo created new ./netcdf_links directory
          /bin/ls -lF ./netcdf_links
          NETCDF=`pwd`/netcdf_links
          export NETCDF
          bedone="yes"
        fi
      else
        bedone="yes"
      fi
    done
  fi
fi

if [ -n "$NETCDF" ] ; then
  echo "Will use NETCDF in dir: $NETCDF"
  # for 3.6.2 and greater there might be a second library, libnetcdff.a .  Check for this and use
  # if available
  NETCDFF=" "
  if [ -f "$NETCDF/lib/libnetcdff.a" ] ; then
    NETCDFF="-lnetcdff"
  fi
else
  echo "Will configure for use without NetCDF"
fi

  # if the uname command exists, give it a shot and see if
  # we can narrow the choices; otherwise, spam 'em
  os="ARCH"
  mach="ARCH"
  type uname > /dev/null
if [ $? -eq 0 ] ; then
    os=`uname`
    if [ "$os" = "AIX" -o "$os" = "IRIX" -o "$os" = "IRIX64" -o "$os" = "SunOS" -o "$os" = "HP-UX"  -o "$os" = "Darwin" ] ; then
      mach="ARCH"
    else
      xxx=`expr "$os" : '\(.........\).*'`
      if [ "$xxx"  = "CYGWIN_NT" ] ; then
        os=$xxx
      fi
      if [ "$os" = "OSF1" -o "$os" = "Linux" -o "$os" = "UNICOS/mp" -o "$os" = "UNIX_System_V" -o "$os" = "CYGWIN_NT" ] ; then
        mach=`uname -m`
      else
        os="ARCH"
        mach="ARCH"
      fi
    fi
fi

wrf_dir="none"
standard_wrf_dirs="WRF WRF-4.0.3 WRF-4.0.2 WRF-4.0.1 WRF-4.0 WRFV3"

if [ ${nowrf} -eq 0 ]; then
   #
   # If no WRF_DIR environment variable is set, try to locate a WRF build in one
   # of the expected directory names one directory level up; otherwise, try to use
   # the WRF I/O library from the code in $WRF_DIR
   #
   if [ -z "$WRF_DIR" ]; then
   #   for d in WRF WRF-4.0.3 WRF-4.0.2 WRF-4.0.1 WRF-4.0 WRFV3; do
      for d in ${standard_wrf_dirs}; do
         if [ -e ../${d}/external/io_netcdf/libwrfio_nf.a ]; then
            echo "Found what looks like a valid WRF I/O library in ../${d}"
            wrf_dir="../${d}"
            break
         fi
      done
   else
      if [ ! -e ${WRF_DIR}/external/io_netcdf/libwrfio_nf.a ]; then
         echo ""
         echo "Error: The \$WRF_DIR environment variable was set, but the WRF code at"
         echo "       ${WRF_DIR} doesn't appear to have been successfully compiled"
         echo ""
         exit
      fi

      echo "Using WRF I/O library in WRF build identified by \$WRF_DIR: ${WRF_DIR}"
      wrf_dir=$WRF_DIR
   fi

   if [ $wrf_dir = "none" ]; then
      echo ""
      echo "Error: No compiled WRF code found. Please check that the WRF model has been compiled"
      echo "       one directory level up (i.e., ../) in a directory named 'WRF', 'WRF-4.0.3', 'WRF-4.0.2', etc.,"
      echo "       or specify the full path to the compiled WRF model with the environment variable \$WRF_DIR ."
      echo ""
      echo "Alternatively, if only WPS components that do no depend on WRF I/O libraries are needed, re-run"
      echo "the configure script with the --nowrf option."
      echo ""
      exit
   fi
else
   cat << EOF
********************************************************************************
Configuring the WPS without a compiled WRF model.
It will not be possible to build the following WPS components, which depend on
the WRF I/O libraries:
  - geogrid
  - metgrid
  - int2nc
********************************************************************************
EOF
fi

grib2dir=""
if [ ${build_grib2} -eq 1 ]; then
   grib2dir="${PWD}/grib2"

   cat << EOF
********************************************************************************
The zlib, libpng, and JasPer libraries will be compiled from source and
installed in ${grib2dir} .

The environment variables JASPERLIB and JASPERINC will be ignored.
********************************************************************************
EOF
fi

# Found perl, so proceed with configuration
perl arch/Config.pl -perl=$PERL -netcdf=$NETCDF -netcdff=$NETCDFF -os=$os -mach=$mach -wrfdir=$wrf_dir -grib2dir=$grib2dir


#Checking cross-compiling capability for some particular environment 
#on Linux and Mac box

if [ $os = "Linux" -o $os = "Darwin" ]; then

  SFC=`grep '^SFC' configure.wps | awk '{print $3}'`
  SCC=`grep '^SCC' configure.wps | awk '{print $3}'`

  SFC="`type $SFC 2>/dev/null | awk '{print $NF}' | sed -e 's/(//g;s/)//g'`"
  SCC="`type $SCC 2>/dev/null | awk '{print $NF}' | sed -e 's/(//g;s/)//g'`"

  if [ -e $NETCDF/lib/libnetcdf.a -a "$SFC" != "" -a "$SCC" != "" ]; then

    SFC_MULTI_ABI=0
    SCC_MULTI_ABI=0
    CROSS_COMPILING=0

    foo=foo_$$

    echo
    echo Testing for NetCDF, C and Fortran compiler
    echo

cat > ${foo}.c <<EOF 
 int main(int argc, char ** argv)
 {
     return (0);
 }
EOF

cat > ${foo}.f <<EOF
          program test_exit
            integer :: STATUS = 0
            call EXIT(STATUS)
          end program test_exit
EOF

    nct=`nm $NETCDF/lib/libnetcdf.a | grep '^0' | cut -d' ' -f 1 | head -1 | wc -c | awk '{print $1+0}'`
    if [ "$nct" -eq "9" ]; then
      netcdf_arch="32-bit"
    else
      netcdf_arch="64-bit"
    fi

    $SFC -o ${foo} ${foo}.f > /dev/null 2>&1 
    SFC_arch="`file ${foo} | grep -o -E '[0-9]{2}-bit|i386'`"
    rm ${foo} ${foo}.o 2> /dev/null

    $SCC -o ${foo} ${foo}.c > /dev/null 2>&1
    SCC_arch="`file ${foo} | grep -o -E '[0-9]{2}-bit|i386'`"
    rm ${foo} ${foo}.o 2> /dev/null

    if [ "$SFC_arch" = "" -o "$SCC_arch" = "" ]; then
      echo "  One of compilers testing failed!"
      echo "  Please check your compiler"
      echo 
      rm -f ${foo} ${foo}.[cfo] 2> /dev/null
      exit
    else
      cp configure.wps configure.wps.edit
    fi

    case $netcdf_arch in

      32-bit|i386 )

      if [ "$SFC_arch" = "64-bit" ] ; then
        CROSS_COMPILING=1
        $SFC -m32 -o ${foo} ${foo}.f > /dev/null 2>&1
        if [ $? = 0 ]; then
          SFC_MULTI_ABI=1
          sed '/^SFC.*=/s/$/ -m32/' configure.wps.edit > configure.wps.tmp
          mv configure.wps.tmp configure.wps.edit
        fi
      fi
      if [ "$SCC_arch" = "64-bit" ] ; then
        CROSS_COMPILING=1
        $SCC -m32 -o ${foo} ${foo}.c > /dev/null 2>&1
        if [ $? = 0 ]; then
          SCC_MULTI_ABI=1
          sed '/^SCC.*=/s/$/ -m32/' configure.wps.edit > configure.wps.tmp
          mv configure.wps.tmp  configure.wps.edit
        fi
      fi

      if [ $CROSS_COMPILING -eq 1 ] ; then
        echo NOTE:
        echo This installation NetCDF is 32-bit
        if [ \( $SFC_MULTI_ABI -ne 1 -a "$SFC_arch" = "64-bit" \) \
             -o \( $SCC_MULTI_ABI -ne 1 -a "$SCC_arch" = "64-bit" \) ] ; then
             rm configure.wps.edit
             echo One of compilers is 64-bit and doesn\'t support cross-compiling.
             echo Please check your NETCDF lib and compiler
        else
          echo -m32 is appended to configure.wps
          echo It will be forced to build in 32-bit.
          echo If you don\'t want 32-bit binaries, please use 64-bit NetCDF, and re-run the configure script.
        fi
      fi
      ;;

      64-bit )

      if [ "$SFC_arch" = "32-bit" -o "$SFC_arch" = "i386" ] ; then
        CROSS_COMPILING=1
        $SFC -m64 -o ${foo} ${foo}.f > /dev/null 2>&1
        if [ $? = 0 ]; then
          SFC_MULTI_ABI=1
          sed '/^SFC.*=/s/$/ -m64/' configure.wps.edit > configure.wps.tmp
          mv configure.wps.tmp configure.wps.edit
        fi
      fi
      if [ "$SCC_arch" = "32-bit" -o "$SCC_arch" = "i386" ] ; then
        CROSS_COMPILING=1
        $SCC -m64 -o ${foo} ${foo}.c > /dev/null 2>&1
        if [ $? = 0 ]; then
          SCC_MULTI_ABI=1
          sed '/^SCC.*=/s/$/ -m64/' configure.wps.edit > configure.wps.tmp
          mv configure.wps.tmp configure.wps.edit
        fi
      fi

      if [ $CROSS_COMPILING -eq 1 ] ; then
        echo NOTE:
        echo This installation NetCDF is 64-bit
        if [ \( $SFC_MULTI_ABI -ne 1 -a "$SFC_arch" != "64-bit" \) \
            -o \( $SCC_MULTI_ABI -ne 1 -a "$SCC_arch" != "64-bit" \) ]; then
            rm configure.wps.edit
            echo One of Compilers is 32-bit and doesn\'t support cross-compiling.
            echo Please check your NetCDF lib and compiler
        else
          echo -m64 is appended to configure.wps
          echo It will be forced to build in 64-bit. 
          echo If you don\'t want 64-bit binaries, please use 32-bit NetCDF, and re-run the configure script.
        fi
      fi
      ;;
    esac
    rm -f ${foo} ${foo}.[cfo] 2> /dev/null

    if [ -e configure.wps.edit ]; then 
      mv configure.wps.edit configure.wps
    fi

    if [ $CROSS_COMPILING -eq 0 ] ; then
      echo This installation NetCDF is $netcdf_arch
      echo C compiler is $SCC_arch
      echo Fortran compiler is $SFC_arch
    fi
    echo

    #  Does our Fortran work with the given NETCDF library.

      /bin/rm -f fort_netcdf.f fort_netcdf
cat > fort_netcdf.f <<EOF 
        program foo
        include 'netcdf.inc'
        integer ncid , status 
        status = nf_open ( 'foo.nc' , 0 , ncid ) 
        print *,'status = ',status
        end program
EOF
    FFLAGS=`grep ^FFLAGS configure.wps | cut -d"=" -f2-`
    FORMAT_FREE=`grep ^FORMAT_FREE configure.wps | cut -d"=" -f2-`
    FFLAGS=`printf "%s" "${FFLAGS}" | sed -e "s/\\$(FORMAT_FREE)/${FORMAT_FREE}/g"`
    cp $NETCDF/include/netcdf.inc .
    FC=`grep ^SFC configure.wps | cut -d"=" -f2-`
    $FC ${FFLAGS} fort_netcdf.f -o fort_netcdf -L${NETCDF}/lib $NETCDFF -lnetcdf > /dev/null 2>&1 
    if [ -f "fort_netcdf" ] ; then
      ./fort_netcdf > /dev/null 2>&1
      if [ $? = 0 ]; then
        /bin/rm -f fort_netcdf.f fort_netcdf.o fort_netcdf netcdf.inc
      else
        echo
        echo "Your Fortran + NETCDF did not run successfully."
        echo
      fi
    else
      echo
      echo "Your versions of Fortran and NETCDF are not consistent."
      echo
    fi

cat > c_test.c <<EOF
#ifndef CRAY
# ifdef NOUNDERSCORE
#      define C_TEST c_test
# else
#   if defined ( F2CSTYLE ) || defined ( _DOUBLEUNDERSCORE )
#      define C_TEST c_test__
#   else
#      define C_TEST c_test_
#   endif
# endif
#endif
#include <stdio.h>

int C_TEST ( float *xx, int *ii )

{
 printf("OK print in C function.  \n" ) ;
 printf("Values are xx = %5.2f and ii = %d \n", *xx, *ii ) ;
 return(0) ;
}
EOF
    CFLAGS=`grep ^CFLAGS configure.wps | cut -d"=" -f2-`
    CPPFLAGS=`grep ^CPPFLAGS configure.wps | cut -d"=" -f2-`
    CC=`grep ^SCC configure.wps | cut -d"=" -f2-`
    ${CC} -c ${CFLAGS} ${CPPFLAGS} c_test.c

cat > f_test.f90 <<EOF
PROGRAM f_test
   INTEGER :: ii
   REAL    :: xx

   ii = 1
   xx = 2

   CALL c_test ( xx , ii ) 

END PROGRAM f_test
EOF
    $FC ${FFLAGS} f_test.f90 -o cf_test c_test.o > /dev/null 2>&1 
    if [ -f "cf_test" ] ; then
      ./cf_test > /dev/null 2>&1
      if [ $? = 0 ]; then
        /bin/rm -f cf_test c_test.c c_test.o f_test.f90 f_test.o
      else
        echo
        echo "Your Fortran + C did not run successfully."
        echo
      fi
    else
      echo
      echo "Your versions of Fortran and C are not consistent."
      echo
    fi

  fi
fi


#
# Check for newer GNU Fortran compilers that require the use of the following:
# -fallow-argument-mismatch
#
cat > gnu_flag_test.F90 << EOF
program gnu_flag_test
#ifdef __GNUC__
#if __GNUC__ > 9
call exit(1)   ! A GNU extension, but at this point we know this is a GNU compiler
#endif
#endif
end program gnu_flag_test
EOF

# The above test program gives exit status 1 iff we are using the GNU Fortran
# compiler with a major version greater than 9

FC=`grep ^SFC configure.wps | cut -d"=" -f2-`
FFLAGS=`grep ^FFLAGS configure.wps | cut -d"=" -f2-`
FORMAT_FREE=`grep ^FORMAT_FREE configure.wps | cut -d"=" -f2-`
FFLAGS=`printf "%s" "${FFLAGS}" | sed -e "s/\\$(FORMAT_FREE)/${FORMAT_FREE}/g"`
$FC ${FFLAGS} gnu_flag_test.F90 -o gnu_flag_test > /dev/null 2>&1
if [ -f ./gnu_flag_test ]; then
   ./gnu_flag_test > /dev/null 2>&1
   if [ $? -eq 1 ]; then
      compat="-fallow-argument-mismatch"
   fi
   rm gnu_flag_test
else
   printf "*** Failed to compile the gnu_flag_test program!\n"
   printf "    This may be because the selected build option does not work correctly.\n"
fi
rm gnu_flag_test.F90

sed "s/CONFIGURE_COMPAT_FLAGS/${compat}/" configure.wps > configure.wps.tmp
mv configure.wps.tmp configure.wps