[Bug 2259] New: Checking for external _res fails

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2259

            Bug ID: 2259
           Summary: Checking for external _res fails
           Product: Portable OpenSSH
           Version: 6.6p1
          Hardware: Other
                OS: Other
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Build system
          Assignee: unassigned-bugs at mindrot.org
          Reporter: sconeu at yahoo.com

I'm not familiar enough with autoconf to edit the configure.ac file,
but...

The location in configure.ac is around line 3902

In the configure script, when it checks to see if _res is an extern,
there are two problems:

1.  There is no ac_WHATEVER variable to control it and override it.
2.  Because the extern reference to _res is unused, the linker on some
systems may elide it, causing an erroneous definition of
HAS__RES_EXTERN

The test should be coded in "configure" as follows:

/* ... confdefs.h */
#include <stdio.h>
#if HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
extern struct __res_state _res;

int
main ()
{
struct __res_state *volatile p = &_res;  /* force resolution of _res */
return 0; }

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