OpenSSH 6.6p1 configure script error

[Scott Neugroschl]

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 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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Scott Neugroschl | XYPRO Technology Corporation
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