[PATCH] Use an alias to `ptsname_r' in login/tst-ptsname.c

[Joseph Myers]

On Wed, 24 May 2017, Arjun Shankar wrote:

> When compiled with `-O3', inlining causes GCC to realize that one of the
> tests calls `ptsname_r' with a NULL buffer and error out when compiling
> with -Wnonnull.
> 
> Declare `ptsname_r_alias' and alias it to `ptsname_r' to avoid this.

Normally in such cases we'd use the DIAG_* macros from libc-diag.h, with 
appropriate comments, to disable the specific warning for the code in 
question.

-- 
Joseph S. Myers
joseph@codesourcery.com