#
# lldp_CHECK_OS
#
# List of supported OS.
#
AC_DEFUN([lldp_DEFINE_OS], [dnl
  case $host_os in
    $1)
      os="$2"
      AC_DEFINE_UNQUOTED(HOST_OS_$3, 1, [Host operating system is $2])
      ;;
  esac
  AM_CONDITIONAL(HOST_OS_$3, test x"$os" = x"$2")dnl
])

AC_DEFUN([lldp_CHECK_OS], [
  AC_CANONICAL_HOST
  AC_MSG_CHECKING([if host OS is supported])

  lldp_DEFINE_OS(linux*, Linux, LINUX)
  lldp_DEFINE_OS(freebsd*|kfreebsd*, FreeBSD, FREEBSD)
  lldp_DEFINE_OS(dragonfly*, [DragonFly BSD], DRAGONFLY)
  lldp_DEFINE_OS(openbsd*, OpenBSD, OPENBSD)
  lldp_DEFINE_OS(netbsd*, NetBSD, NETBSD)
  lldp_DEFINE_OS(darwin*, macOS, OSX)
  lldp_DEFINE_OS(solaris*, Solaris, SOLARIS)

  if test x"$os" = x; then
     AC_MSG_RESULT(no)
     AC_MSG_ERROR([*** unsupported OS $host_os])
  fi
  AC_MSG_RESULT([yes ($os)])
])

# Enable some additional CFLAGS depending on the OS
AC_DEFUN([lldp_CFLAGS_OS], [
  # Most of what we want can be enabled nowadays with _GNU_SOURCE
  AX_CFLAGS_GCC_OPTION([-D_GNU_SOURCE], [LLDP_CPPFLAGS])    dnl GNU systems (asprintf, ...)

  case $host_os in
     solaris*)
       AX_CFLAGS_GCC_OPTION([-D__EXTENSIONS__], [LLDP_CPPFLAGS]) dnl (CMSG_*)
       AX_CFLAGS_GCC_OPTION([-D_XPG4_2], [LLDP_CPPFLAGS])        dnl (CMSG_*)
       ;;
     hpux*)
       AX_CFLAGS_GCC_OPTION([-D_XOPEN_SOURCE=500], [LLDP_CPPFLAGS])      dnl HP-UX
       AX_CFLAGS_GCC_OPTION([-D_XOPEN_SOURCE_EXTENDED], [LLDP_CPPFLAGS]) dnl HP-UX
       ;;
  esac
])