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

[Paul Eggert]

On 10/26/18 4:26 PM, Albert ARIBAUD wrote:
> Ok, so this requirement extends to all functions called by mktime(),
> directly or indirectly (and ditto for gmtime).

Hmm, well, I'm starting to see why you'd rather have mktime save and 
restore errno when there's not an error. That would also be OK, and that 
might lighten the load on the functions mktime calls.