#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2011-2017 blueCAPE Lda
#     Copyright (C) 2019 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     wmakeWindowsDlOpenLibs
#
# Usage
#     wmakeWindowsDlOpenLibs <build/applications/.../options>
#
# Description
#     Extract library dependencies from the EXE_LIBS entry for Windows
#     applications and emit as FOAM_DLOPEN_LIBS for use with setRootCase.H
#     Forcibly dlOpen'ing these libraries ensures that they are truly loaded
#     for the windows application binary.
#
#     An alternative means is to define external entry points into particular
#     libraries and linking with '-u symbol', which would possibly have a lower
#     overhead but is more code-intrusive and somewhat ad hoc.
#
#------------------------------------------------------------------------------
optionsFile="$1"

[ "$#" -gt 0 ] || exit 1
[ -f "$optionsFile" ] || exit 2
[ -r "$optionsFile" ] || exit 2

# Representative exeName from the build path (for messages only)
# Eg, build/.../basic/laplacianFoam/options -> laplacianFoam

exeName="${optionsFile%/options}"   # Strip trailing '/options'
exeName="${exeName##*/}"            # Strip leading path

# Use only OpenFOAM-related libraries that we will can actually find
hasLib()
{
    libFile="lib${1}.dll"   # NB: Windows only (.dll)

    [ -e "$FOAM_LIBBIN/$libFile" ] || \
    [ -e "$FOAM_USER_LIBBIN/$libFile" ] || \
    [ -e "$FOAM_LIBBIN/$FOAM_MPI/$libFile" ]
}


# After the cpp stage, the EXE_LIBS (if they exist) will be on a single line
# Extract EXE_LIBS = -labc ..., ignoring -L and .o entries
#
# The libNames output comprises comma-separated quoted strings
#     "lib1","lib2","libN"
# these are suitable for C-code or a std::initializer_list<fileName> etc.

# The $() sub-shell is unquoted to ensure we get whitespace splitting
# and read individual words, not lines.
unset libNames
for lib in $(sed -ne 's@^.*EXE\_LIBS.*=[ ]*@@p' "$optionsFile")
do
    case "$lib" in
    (*.o | *')'*)
        ;;

    (-l[0-9A-Za-z]*)
        lib="${lib#-l}"
        hasLib "$lib" && libNames="$libNames${libNames:+,}\"$lib\""
        ;;
    esac
done

## Debugging: echo "$exeName: libNames=$libNames" 1>&2

# Emit define for using with Foam::dlOpen()
if [ -n "$libNames" ]
then
    echo "Adding dlOpen(dll) list for $exeName" 1>&2
    echo "EXE_INC += -DFOAM_DLOPEN_LIBS='$libNames'"
fi

exit 0 # clean exit

#------------------------------------------------------------------------------