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Date: Thu, 16 Jan 2020 17:53:42 +0400
From: Abdessattar Sassi <>
Subject: Implementation of built-in locale only allows for 'C.UTF-8' and fails
 with just 'C'


I run into a problem compiling a C library into WASM using emscripten,
which in turn uses libmusl.

The library calls 'locale_t __newlocale(int mask, const char *name, locale_t
loc)' with name being "C".
the implementation in musl calls __get_locale() with val being "C":
-- extracted from locale_map.c:

int builtin = (val[0]=='C' && !val[1])
>       || !strcmp(val, "C.UTF-8")
>       || !strcmp(val, "POSIX");
> if (builtin) {
>       if (cat == LC_CTYPE && val[1]=='.')
>             return (void *)&__c_dot_utf8;
>       return 0;
> }

If I understand that code correctly, it will return 0 (fail) if the name is
just "C" and not "C.UTF-8".

Is this the intended behavior? (note that glibc and others do NOT require
the .UTF-8, a simple 'C' works just fine and many existing code relies on

Thank you.

*Please Cc: me in reply.*

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