dnl -*- shell-script -*-
dnl
dnl Copyright (c)      2008 The University of Tennessee and The University
dnl                         of Tennessee Research Foundation.  All rights
dnl                         reserved.
dnl Copyright (c) 2021 Cisco Systems, Inc.  All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl

######################################################################
#
# OMPI_INTERIX
#
# Detect if the environment is SUA/SFU (i.e. Interix) and modify
# the compiling environment accordingly.
#
# USAGE:
#   OMPI_INTERIX()
#
######################################################################
AC_DEFUN([OMPI_INTERIX],[

    AC_MSG_CHECKING(for Interix environment)
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
                   [#if !defined(__INTERIX)
                    #error Normal Unix environment
                    #endif])],
                   is_interix=yes,
                   is_interix=no)
    AC_MSG_RESULT([$is_interix])
    if test "$is_interix" = "yes"; then

        opal_show_subtitle "Interix detection"

        if ! test -d /usr/include/port; then
            AC_MSG_WARN([Compiling Open MPI under Interix require an up-to-date])
            AC_MSG_WARN([version of libport. Please ask your system administrator])
            AC_MSG_WARN([to install it (pkg_update -L libport).])
            AC_MSG_ERROR([*** Cannot continue])
        fi
        #
        # These are the minimum requirements for Interix ...
        #
        AC_MSG_WARN([    -lport was added to the linking flags])
        LDFLAGS="-lport $LDFLAGS"
        AC_MSG_WARN([    -D_ALL_SOURCE -D_USE_LIBPORT was added to the compilation flags])
        CFLAGS="-D_ALL_SOURCE -D_USE_LIBPORT -I/usr/include/port $CFLAGS"
        CPPFLAGS="-D_ALL_SOURCE -D_USE_LIBPORT -I/usr/include/port $CPPFLAGS"
        CXXFLAGS="-D_ALL_SOURCE -D_USE_LIBPORT -I/usr/include/port $CXXFLAGS"

    fi

])