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Message-ID: <1406295538.6438.50.camel@eris.loria.fr>
Date: Fri, 25 Jul 2014 15:38:58 +0200
From: Jens Gustedt <jens.gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: Re: C11 threads
Am Freitag, den 25.07.2014, 15:04 +0200 schrieb Szabolcs Nagy:
> > The term "inequal function pointer" had nothing pop up. Could you give
> > a reference to the relevant part in POSIX that makes the requirement
> > for a "strong" symbol?
>
>
> hm i might be wrong:
>
> there is a requirement in c and posix that the address of a
> standard function can be taken and that == is only true for
> function pointers if they point to the same function
>
> but i don't see any requirement that each library function
> must be distinct
>
> and there is a dr that implies the opposite:
>
> http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_078.html
>
> without explanation the response says h can return 0.
That DR is only for C. Would be interesting to have something for
POSIX, too.
> the musl math library currently defines distinct long double
> functions even if long double and double have the same
> representation, they could be weak aliases if the standard
> allows this..
It is completely sound as a policy to have no exported user functions
as weak aliases. It reduces the possibility the user shooting him or
herself in the foot.
Whatever choice would be fine with me.
Jens
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