>
>
>>setlocale() requires the ".codebase" in the locale. From the man pages, 
>>this is an optional detail.
>>
>>I opened a PR for this: lib/25877
>>    
>>
>
>The description in nls(7) just specifies the possible lexical form of
>a locale name.
>setlocale() is not bad even if it does not accept such omitted form
>for a language, because such form is not available for all languages.
>
>(I do not prefer such ommited form because of ambiguousness...)
>  
>
Personally I don't care what setlocale() accepts or doesn't accept.
I guess if the man page says the format _is_
language[_territory][.codeset][@modifier]
and setlocale() doesn't accept en_CA then:

either setlocale() is buggy;
or the nls(7) man page is wrong;
or the setlocale(3) man page should specify its own format and not refer 
to nls(7)

JL