Document trailing whitespace policy.

[bpt/guile.git] / m4 / arpa_inet_h.m4

# arpa_inet_h.m4 serial 5
dnl Copyright (C) 2006, 2008 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl Written by Simon Josefsson and Bruno Haible

AC_DEFUN([gl_HEADER_ARPA_INET],
[
  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
  dnl once only, before all statements that occur in other macros.
  AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])

  AC_CHECK_HEADERS_ONCE([arpa/inet.h])
  if test $ac_cv_header_arpa_inet_h = yes; then
    HAVE_ARPA_INET_H=1
  else
    ARPA_INET_H='arpa/inet.h'
    HAVE_ARPA_INET_H=0
  fi
  AC_SUBST([HAVE_ARPA_INET_H])
  dnl Execute this unconditionally, because ARPA_INET_H may be set by other
  dnl modules, after this code is executed.
  gl_CHECK_NEXT_HEADERS([arpa/inet.h])
])

dnl Unconditionally enables the replacement of <arpa/inet.h>.
AC_DEFUN([gl_REPLACE_ARPA_INET_H],
[
  AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
  ARPA_INET_H='arpa/inet.h'
])

AC_DEFUN([gl_ARPA_INET_MODULE_INDICATOR],
[
  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
])

AC_DEFUN([gl_ARPA_INET_H_DEFAULTS],
[
  GNULIB_INET_NTOP=0;     AC_SUBST([GNULIB_INET_NTOP])
  GNULIB_INET_PTON=0;     AC_SUBST([GNULIB_INET_PTON])
  dnl Assume proper GNU behavior unless another module says otherwise.
  HAVE_DECL_INET_NTOP=1;  AC_SUBST([HAVE_DECL_INET_NTOP])
  HAVE_DECL_INET_PTON=1;  AC_SUBST([HAVE_DECL_INET_PTON])
  ARPA_INET_H='';         AC_SUBST([ARPA_INET_H])
])