gnulib/import/m4/inet_ntop.m4

   1 # inet_ntop.m4 serial 21
   2 dnl Copyright (C) 2005-2006, 2008-2019 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 Haiku provides it in -lnetwork.
  20   dnl Native Windows provides it in -lws2_32 instead, with a declaration in
  21   dnl <ws2tcpip.h>, and it uses stdcall calling convention, not cdecl
  22   dnl (hence we cannot use AC_CHECK_FUNCS, AC_SEARCH_LIBS to find it).
  23   HAVE_INET_NTOP=1
  24   INET_NTOP_LIB=
  25   gl_PREREQ_SYS_H_WINSOCK2
  26   if test $HAVE_WINSOCK2_H = 1; then
  27     dnl It needs to be overridden, because the stdcall calling convention
  28     dnl is not compliant with POSIX.  Set REPLACE_INET_NTOP in order to avoid
  29     dnl a name conflict at the linker level, even though the header file
  30     dnl <ws2tcpip.h> declares inet_ntop only if _WIN32_WINNT >= 0x0600.
  31     REPLACE_INET_NTOP=1
  32     AC_CHECK_DECLS([inet_ntop],,, [[#include <ws2tcpip.h>]])
  33     if test $ac_cv_have_decl_inet_ntop = yes; then
  34       INET_NTOP_LIB="-lws2_32"
  35     else
  36       HAVE_DECL_INET_NTOP=0
  37     fi
  38   else
  39     gl_save_LIBS=$LIBS
  40     AC_SEARCH_LIBS([inet_ntop], [nsl resolv network], [],
  41       [AC_CHECK_FUNCS([inet_ntop])
  42        if test $ac_cv_func_inet_ntop = no; then
  43          HAVE_INET_NTOP=0
  44        fi
  45       ])
  46     LIBS=$gl_save_LIBS
  47
  48     if test "$ac_cv_search_inet_ntop" != "no" \
  49        && test "$ac_cv_search_inet_ntop" != "none required"; then
  50       INET_NTOP_LIB="$ac_cv_search_inet_ntop"
  51     fi
  52
  53     AC_CHECK_HEADERS_ONCE([netdb.h])
  54     AC_CHECK_DECLS([inet_ntop],,,
  55       [[#include <arpa/inet.h>
  56         #if HAVE_NETDB_H
  57         # include <netdb.h>
  58         #endif
  59       ]])
  60     if test $ac_cv_have_decl_inet_ntop = no; then
  61       HAVE_DECL_INET_NTOP=0
  62     fi
  63   fi
  64   AC_SUBST([INET_NTOP_LIB])
  65 ])
  66
  67 # Prerequisites of lib/inet_ntop.c.
  68 AC_DEFUN([gl_PREREQ_INET_NTOP], [
  69   AC_REQUIRE([gl_SOCKET_FAMILIES])
  70 ])