Home/ Questions/Q 8746747
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-13T12:14:36+00:00

I am looking for an AC_CHECK_* function that let’s me change a behavior in

  • 0

I am looking for an AC_CHECK_* function that let’s me change a behavior in my code depending on whether pppd/pppd.h contains

extern struct notifier *ipv6_up_notifier;

which was added recently. It is actually provided in pppd/ipc6cp.h:

struct notifier *ipv6_up_notifier = NULL;

I have tried with

AC_CHECK_DECLS(notifier *ipv6_up_notifier,,, [#include <pppd/pppd.h>])
AC_CHECK_DECLS(extern notifier *ipv6_up_notifier,,, [#include <pppd/pppd.h>])
AC_CHECK_DECLS(struct notifier *ipv6_up_notifier,,, [#include <pppd/pppd.h>])
AC_CHECK_DECLS(extern struct notifier *ipv6_up_notifier,,, [#include <pppd/pppd.h>])

but all this leads to

checking whether notifier *ipv6_up_notifier is declared... no

when ./configure’ing. Is it at all possible to check for extern’s?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    As discussed in the comments, the first argument is variable name (without type):

    AC_CHECK_DECLS([ipv6_up_notifier], [], [], [#include <pppd/pppd.h>])
    • 0