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Date: Thu, 4 Feb 2016 15:54:09 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: setcontext/getcontext/makecontext missing?
* Short, Todd <tshort@...mai.com> [2016-02-04 14:09:30 +0000]:
>
> It appears that setcontext/getcontext/makecontext are declared in ./include/ucontext.h, but there???s no definitions for them in musl. These three functions are part of libc/glibc.so:
>
these are deprecated posix apis.
> Since the functions are declared, is there any intent to put them into musl?
>
they have unclear semantics and only possible to
implement in asm (hence it is a significant effort
to add them).
> I ran into this when attempting to compile OpenSSL with musl. In the OpenSSL master branch, I???m able to do:
>
> CC=musl-gcc ./config
> make depend
> make
>
> However, ld fails because there is an undefined reference to setcontext, getcontext and makecontext. This is new async functionality in OpenSSL that uses these APIS.
>
imho that's an openssl bug.
if they really need the *context apis, then use adequate
(link-time) configure check for them.
but looking at
http://git.openssl.org/?p=openssl.git;a=commit;h=a3667c316ae60ef454fb804221c3ca44af30a9aa
this async lib is probably misguided, but they can
implement the api with pthreads in a portable way.
> This is as of musl:master:47314f1 and openssl:master:4c35c93
>
>
> Thanks,
>
> --
> -Todd Short
> // tshort@...mai.com<mailto:tshort@...mai.com>
> // "One if by land, two if by sea, three if by the Internet."
>
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