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# inet_pton.m4 serial 19
dnl Copyright (C) 2006, 2008-2020 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.
AC_DEFUN([gl_FUNC_INET_PTON],
[
AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
dnl Persuade Solaris <arpa/inet.h> to declare inet_pton.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([AC_C_RESTRICT])
dnl Most platforms that provide inet_pton define it in libc.
dnl Solaris 8..10 provide inet_pton in libnsl instead.
dnl Solaris 2.6..7 provide inet_pton in libresolv instead.
dnl Haiku provides it in -lnetwork.
dnl Native Windows provides it in -lws2_32 instead, with a declaration in
dnl <ws2tcpip.h>, and it uses stdcall calling convention, not cdecl
dnl (hence we cannot use AC_CHECK_FUNCS, AC_SEARCH_LIBS to find it).
HAVE_INET_PTON=1
INET_PTON_LIB=
gl_PREREQ_SYS_H_WINSOCK2
if test $HAVE_WINSOCK2_H = 1; then
dnl It needs to be overridden, because the stdcall calling convention
dnl is not compliant with POSIX. Set REPLACE_INET_PTON in order to avoid
dnl a name conflict at the linker level, even though the header file
dnl <ws2tcpip.h> declares inet_pton only if _WIN32_WINNT >= 0x0600.
REPLACE_INET_PTON=1
AC_CHECK_DECLS([inet_pton],,, [[#include <ws2tcpip.h>]])
if test $ac_cv_have_decl_inet_pton = yes; then
INET_PTON_LIB="-lws2_32"
else
HAVE_DECL_INET_PTON=0
fi
else
gl_save_LIBS=$LIBS
AC_SEARCH_LIBS([inet_pton], [nsl resolv network], [],
[AC_CHECK_FUNCS([inet_pton])
if test $ac_cv_func_inet_pton = no; then
HAVE_INET_PTON=0
fi
])
LIBS=$gl_save_LIBS
if test "$ac_cv_search_inet_pton" != "no" \
&& test "$ac_cv_search_inet_pton" != "none required"; then
INET_PTON_LIB="$ac_cv_search_inet_pton"
fi
AC_CHECK_HEADERS_ONCE([netdb.h])
AC_CHECK_DECLS([inet_pton],,,
[[#include <arpa/inet.h>
#if HAVE_NETDB_H
# include <netdb.h>
#endif
]])
if test $ac_cv_have_decl_inet_pton = no; then
HAVE_DECL_INET_PTON=0
fi
fi
AC_SUBST([INET_PTON_LIB])
])
# Prerequisites of lib/inet_pton.c.
AC_DEFUN([gl_PREREQ_INET_PTON], [
AC_REQUIRE([gl_SOCKET_FAMILIES])
])
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