gnulib/import/m4/inet_ntop.m4

   1 # inet_ntop.m4 serial 19
   2 dnl Copyright (C) 2005-2006, 2008-2016 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 AC_DEFUN([gl_FUNC_INET_NTOP],
   8 [
   9   AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
  10
  11   dnl Persuade Solaris <arpa/inet.h> to declare inet_ntop.
  12   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  13
  14   AC_REQUIRE([AC_C_RESTRICT])
  15
  16   dnl Most platforms that provide inet_ntop define it in libc.
  17   dnl Solaris 8..10 provide inet_ntop in libnsl instead.
  18   dnl Solaris 2.6..7 provide inet_ntop in libresolv instead.
  19   dnl Native Windows provides it in -lws2_32 instead, with a declaration in
  20   dnl <ws2tcpip.h>, and it uses stdcall calling convention, not cdecl
  21   dnl (hence we cannot use AC_CHECK_FUNCS, AC_SEARCH_LIBS to find it).
  22   HAVE_INET_NTOP=1
  23   INET_NTOP_LIB=
  24   gl_PREREQ_SYS_H_WINSOCK2
  25   if test $HAVE_WINSOCK2_H = 1; then
  26     AC_CHECK_DECLS([inet_ntop],,, [[#include <ws2tcpip.h>]])
  27     if test $ac_cv_have_decl_inet_ntop = yes; then
  28       dnl It needs to be overridden, because the stdcall calling convention
  29       dnl is not compliant with POSIX.
  30       REPLACE_INET_NTOP=1
  31       INET_NTOP_LIB="-lws2_32"
  32     else
  33       HAVE_DECL_INET_NTOP=0
  34       HAVE_INET_NTOP=0
  35     fi
  36   else
  37     gl_save_LIBS=$LIBS
  38     AC_SEARCH_LIBS([inet_ntop], [nsl resolv], [],
  39       [AC_CHECK_FUNCS([inet_ntop])
  40        if test $ac_cv_func_inet_ntop = no; then
  41          HAVE_INET_NTOP=0
  42        fi
  43       ])
  44     LIBS=$gl_save_LIBS
  45
  46     if test "$ac_cv_search_inet_ntop" != "no" \
  47        && test "$ac_cv_search_inet_ntop" != "none required"; then
  48       INET_NTOP_LIB="$ac_cv_search_inet_ntop"
  49     fi
  50
  51     AC_CHECK_HEADERS_ONCE([netdb.h])
  52     AC_CHECK_DECLS([inet_ntop],,,
  53       [[#include <arpa/inet.h>
  54         #if HAVE_NETDB_H
  55         # include <netdb.h>
  56         #endif
  57       ]])
  58     if test $ac_cv_have_decl_inet_ntop = no; then
  59       HAVE_DECL_INET_NTOP=0
  60     fi
  61   fi
  62   AC_SUBST([INET_NTOP_LIB])
  63 ])
  64
  65 # Prerequisites of lib/inet_ntop.c.
  66 AC_DEFUN([gl_PREREQ_INET_NTOP], [
  67   AC_REQUIRE([gl_SOCKET_FAMILIES])
  68 ])