gnulib/import/m4/netdb_h.m4

   1 # netdb_h.m4 serial 15
   2 dnl Copyright (C) 2008-2022 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_ONCE([gl_NETDB_H],
   8 [
   9   AC_REQUIRE([gl_NETDB_H_DEFAULTS])
  10   gl_CHECK_NEXT_HEADERS([netdb.h])
  11   if test $ac_cv_header_netdb_h = yes; then
  12     HAVE_NETDB_H=1
  13   else
  14     HAVE_NETDB_H=0
  15   fi
  16   AC_SUBST([HAVE_NETDB_H])
  17
  18   dnl Check for declarations of anything we want to poison if the
  19   dnl corresponding gnulib module is not in use.
  20   gl_WARN_ON_USE_PREPARE([[#include <netdb.h>]],
  21     [getaddrinfo freeaddrinfo gai_strerror getnameinfo])
  22 ])
  23
  24 # gl_NETDB_MODULE_INDICATOR([modulename])
  25 # sets the shell variable that indicates the presence of the given module
  26 # to a C preprocessor expression that will evaluate to 1.
  27 # This macro invocation must not occur in macros that are AC_REQUIREd.
  28 AC_DEFUN([gl_NETDB_MODULE_INDICATOR],
  29 [
  30   dnl Ensure to expand the default settings once only.
  31   gl_NETDB_H_REQUIRE_DEFAULTS
  32   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
  33   dnl Define it also as a C macro, for the benefit of the unit tests.
  34   gl_MODULE_INDICATOR_FOR_TESTS([$1])
  35 ])
  36
  37 # Initializes the default values for AC_SUBSTed shell variables.
  38 # This macro must not be AC_REQUIREd.  It must only be invoked, and only
  39 # outside of macros or in macros that are not AC_REQUIREd.
  40 AC_DEFUN([gl_NETDB_H_REQUIRE_DEFAULTS],
  41 [
  42   m4_defun(GL_MODULE_INDICATOR_PREFIX[_NETDB_H_MODULE_INDICATOR_DEFAULTS], [
  43     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETADDRINFO])
  44   ])
  45   m4_require(GL_MODULE_INDICATOR_PREFIX[_NETDB_H_MODULE_INDICATOR_DEFAULTS])
  46   AC_REQUIRE([gl_NETDB_H_DEFAULTS])
  47 ])
  48
  49 AC_DEFUN([gl_NETDB_H_DEFAULTS],
  50 [
  51   dnl Assume proper GNU behavior unless another module says otherwise.
  52   HAVE_STRUCT_ADDRINFO=1;   AC_SUBST([HAVE_STRUCT_ADDRINFO])
  53   HAVE_DECL_FREEADDRINFO=1; AC_SUBST([HAVE_DECL_FREEADDRINFO])
  54   HAVE_DECL_GAI_STRERROR=1; AC_SUBST([HAVE_DECL_GAI_STRERROR])
  55   HAVE_DECL_GETADDRINFO=1;  AC_SUBST([HAVE_DECL_GETADDRINFO])
  56   HAVE_DECL_GETNAMEINFO=1;  AC_SUBST([HAVE_DECL_GETNAMEINFO])
  57   REPLACE_GAI_STRERROR=0;   AC_SUBST([REPLACE_GAI_STRERROR])
  58   REPLACE_GETADDRINFO=0;    AC_SUBST([REPLACE_GETADDRINFO])
  59 ])