#! /bin/sh
##
# Copyright by The HDF Group.
# All rights reserved.
#
# This file is part of HDF5.  The full HDF5 copyright notice, including
# terms governing use, modification, and redistribution, is contained in
# the LICENSE file, which can be found at the root of the source code
# distribution tree, or in https://www.hdfgroup.org/licenses.
# If you do not have access to either file, you may request a copy from
# help@hdfgroup.org.
##

# Constants definitions
EXIT_SUCCESS=0
EXIT_FAILURE=1

# Variables to control final behavior of script
do_show="no"
do_compile="yes"
do_link="yes"

# Add the HDF5 library directory to the rpath of the
# built executable/library by default
add_rpath="yes"

# Variables for arguments passed to pkg-config and compiler
pc_args="${HDF5_PKG_CONFIG_ARGS}"
compile_args=""
prefix=""
libdir=""

# Variables for flags passed to pkg-config and compiler
pc_flags=""

status=$EXIT_SUCCESS

# Determine name and location of script
prg=$0
if [ ! -e "$prg" ]; then
  case $prg in
    (*/*) exit 1;;
    (*) prg=$(command -v -- "$prg") || exit;;
  esac
fi
dir=$(
  cd -P -- "$(dirname -- "$prg")/.." && pwd -P
) || exit

prog_name=$(basename -- "$prg") || exit
prg=$dir/bin/$prog_name

prefix=$dir

libdir=$dir/lib

export PKG_CONFIG_PATH=$libdir/pkgconfig

# Show the configuration summary of the library recorded in the
# libhdf5.settings file residing in the lib directory.
showconfigure()
{
  cat $dir/lib/libhdf5.settings
  status=$?
}

usage() {
  # "How-to use" message.
  echo "usage: $prog_name [OPTIONS] <compile line>"
  echo "  OPTIONS:"
  echo "    -help | --help | -h   This help message."
  echo "    -echo                 Show all the shell commands executed"
  echo "    -show                 Show the commands without executing them"
  echo "    -showconfig           Show the HDF5 library configuration summary"
  echo "    -shlib                Compile with shared HDF5 libraries [default for"
  echo "                          hdf5 built with shared libraries]"
  echo "    -noshlib              Compile with static HDF5 libraries [default for"
  echo "                          hdf5 built without shared libraries]"
  echo "    -nohl                 By default, $prog_name builds and links against the"
  echo "                          high-level HDF5 library, if it is available."
  echo "                          Specifying the -nohl option disables this behavior."
  echo "    -norpath              By default, $prog_name adds the library directory"
  echo "                          of the HDF5 installation to the rpath of the resulting"
  echo "                          executable/library when linking against shared HDF5"
  echo "                          libraries. If this behavior is not desired or is"
  echo "                          problematic for a particular compiler/linker, specifying"
  echo "                          the -norpath option disables this behavior."
  echo "    -c                    Compile and assemble without linking. When combined"
  echo "                          with -show, displays only the compile flags without"
  echo "                          displaying the linking flags. Otherwise, passes the"
  echo "                          '-c' flag to the compiler, where it's assumed that"
  echo "                          the flag will have the behavior of 'compile and"
  echo "                          assemble without linking'. Note that this may not"
  echo "                          be the case for some compilers."
  echo " "
  echo "  <compile line>  - the normal compile line options for your compiler."
  echo "                    $prog_name uses the same compiler you used to compile"
  echo "                    HDF5, unless an alternate compiler is specified at"
  echo "                    configuration time. Check with your compiler's man"
  echo "                    pages for more information on which options are needed."
  echo " "
  echo "                    All options specific to $prog_name should appear BEFORE"
  echo "                    any options specified for <compile line>."
  echo " "
  echo " You can override whether or not to use shared or static HDF5 libraries"
  echo " by setting the following environment variable:"
  echo " "
  echo "   HDF5_USE_SHLIB=[yes|no]  -  use shared or static version of the HDF5 library."
  echo "                               precedence is given to the -shlib/-noshlib options."
  echo "                                 [default: yes except when built with only"
  echo "                                           static libraries]"
  echo " "
  echo " $prog_name uses pkg-config to determine additional flags to pass to the"
  echo " compiler. You can specify any options to pass to pkg-config by setting the"
  echo " following environment variable:"
  echo " "
  echo "   HDF5_PKG_CONFIG_ARGS"
  echo " "
}

if test $# -eq 0; then
  # No parameters specified, issue usage statement and exit.
  usage
  exit $EXIT_FAILURE
fi

# If a shared library is available, the default will be to use it. If the only
# available library is static, it will be used by default.  The user can
# override either default, although choosing an unavailable library will result
# in errors from h5cc.
SHARED_AVAILABLE="ON"
STATIC_AVAILABLE="OFF"
if test "${SHARED_AVAILABLE}" = "ON"; then
  USE_SHARED_LIB="${HDF5_USE_SHLIB:-yes}"
else
  USE_SHARED_LIB="${HDF5_USE_SHLIB:-no}"
fi

# If the high-level library is available, the default will be to build and
# link against it.
USE_HL_LIB="yes"
HL_AVAILABLE="ON"
if test "${HL_AVAILABLE}" = "ON"; then
  HL_LIB_NAME="hdf5_hl_cpp"
else
  USE_HL_LIB="no"
fi

for arg in $@ ; do
  case "$arg" in
    -help|--help|-h)
      usage
      exit $EXIT_SUCCESS
      ;;
    -echo)
      shift
      set -x
      ;;
    -show)
      shift
      # Delay showing command-line until arguments have been processed
      do_show="yes"
      ;;
    -showconfig)
      showconfigure
      exit $status
      ;;
    -shlib)
      shift
      USE_SHARED_LIB="yes"
      ;;
    -noshlib)
      shift
      USE_SHARED_LIB="no"
      ;;
    -nohl)
      shift
      USE_HL_LIB="no"
      ;;
    -norpath)
      shift
      add_rpath="no"
      ;;
    -c)
      compile_args="${compile_args:+${compile_args} }$arg"
      shift

      do_link="no"
      ;;
    *)
      # For now, any unrecognized arguments are passed directly on to the
      # compiler to simplify handling of them. It's assumed that any
      # h5cc-specific options come before these arguments. If this proves
      # to be insufficient, arguments should be stored somewhere and
      # shifted off the command-line.
      ;;
  esac
done

# Check availability of default or requested HDF5 library type
if test "${USE_SHARED_LIB}" = "yes" -a "${SHARED_AVAILABLE}" != "ON"; then
  echo "error: linking against shared HDF5 libraries was requested, but shared HDF5 libraries aren't available" >&2
  exit $EXIT_FAILURE
elif test "${USE_SHARED_LIB}" = "no" -a "${STATIC_AVAILABLE}" != "ON"; then
  echo "error: linking against static HDF5 libraries was requested, but static HDF5 libraries aren't available" >&2
  exit $EXIT_FAILURE
fi

# Add in relevant flags to pkg-config command
pc_args="${pc_args:+${pc_args} }--define-variable=prefix=$prefix"

if test "$do_compile" = "yes"; then
  pc_args="${pc_args:+${pc_args} }--cflags"
fi

if test "$do_link" = "yes"; then
  pc_args="${pc_args:+${pc_args} }--libs"
fi

if test "$USE_SHARED_LIB" = "no"; then
  pc_args="${pc_args:+${pc_args} }--static"
fi

pc_args="${pc_args:+${pc_args} }hdf5_cpp"

# Build and link against high-level library,
# unless requested not to.
if test "${USE_HL_LIB}" = "yes"; then
  pc_args="${pc_args:+${pc_args} }${HL_LIB_NAME}"
fi

# Evaluate pkg-config command for later use
pc_flags="`pkg-config $pc_args`"
if test $? -ne 0; then
  echo "pkg-config failed with arguments: $pc_args" >&2
  exit $EXIT_FAILURE
fi

# If linking against static HDF5 libraries, fixup the
# flags generated by pkg-config to point to the static
# libraries
if test "$do_link" = "yes" -a "$USE_SHARED_LIB" = "no"; then
  # Escape '/' in libdir path to not conflict with sed delimiter
  escaped_libdir=$(echo "$libdir" | sed 's/\//\\\//g')

  # Replace flags of form '-lhdf5*' with path to matching static library
  edited_pc_flags=$(echo "$pc_flags" | sed -E 's/-l(hdf5[a-z0-9_]*)/'"${escaped_libdir}\/"'lib\1.a/g')
  if test $? -ne 0; then
    echo "couldn't edit flags to compile against static HDF5 libraries" >&2
    exit $EXIT_FAILURE
  fi

  pc_flags=$edited_pc_flags
fi

# If linking against shared HDF5 libraries, add the
# HDF5 library directory to the rpath of the executable
# if not requested not to.
if test "$do_link" = "yes" -a "$USE_SHARED_LIB" = "yes" -a "$add_rpath" = "yes"; then
  # Simply assume that the -Wl,-rpath,<dir> form is acceptable
  # for the compiler and -rpath is a linker option. Add
  # compiler/linker-specific logic as needed.
  compile_args="${compile_args:+${compile_args} }-Wl,-rpath,$libdir"
fi

# If -show was passed, only output the command-line, don't execute it
if test "$do_show" = "yes"; then
  echo /usr/bin/c++ ${compile_args:+"${compile_args} "}"$@" "$pc_flags"
  exit $EXIT_SUCCESS
fi

/usr/bin/c++ $compile_args "$@" $pc_flags
status=$?

if test $status -ne 0; then
  echo "compile failed with command: /usr/bin/c++ $compile_args $@ $pc_flags" >&2
fi

exit $status