[PATCH] Ensure mktime sets errno on error (bug 23789)

[Albert ARIBAUD]

Hi Paul,

On Fri, 26 Oct 2018 15:45:29 -0700, Paul Eggert <eggert@cs.ucla.edu>
wrote :

> On 10/26/18 2:18 PM, Albert ARIBAUD wrote:
> > Is it allowed behavior to
> > alter errno when not returning an error condition?  
> 
> Ordinarily yes. But it would be better if mktime left errno alone when 
> -1 does not represent an error, so that the caller can easily 
> distinguish valid -1 return values from erroneous ones.

Ok, so this requirement extends to all functions called by mktime(),
directly or indirectly (and ditto for gmtime).

Cordialement,
Albert ARIBAUD
3ADEV