Sender: Harald Arnesen <skogtun@gmail.com>
Subject: [alpine-devel] Non-standard C library
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From: Harald Arnesen <harald@skogtun.org>
Message-ID: <717ca2a3-d579-4ab6-ace2-1bc0dbbb111c@skogtun.org>
Date: Tue, 31 Jan 2017 19:22:37 +0100
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musl defines "IPPORT_RESERVED" in "netdb.h", while both GNU libc and BSD
libc define it in "netinet/in.h". And I can't find an e-mail address for
a musl developer without subscribing to their mailing list.


This is from a conversation with Snobol maintainer Phil Budne:

> > This one is from an old Asus EeePC 900, running AlpineLinux, which uses
> > the musl libc instead of glibc. A compile error ('IPPORT_RESERVED'
> > undeclared) in 'lib/auxil/bindresvport.c' was fixed by
> > '#include <netdb.h>'

Thanks!

I'd report it as a bug in libc....  IPPORT_RESERVED is a property of
on the wire protocol (or at least the local TCP stack), while
<netdb.h> is the interface for hostname lookups.

Linux and BSD agree the constant comes from netinet/in.h

And charmingly, they refuse to define an ifdef so you can tell
you're using their broken library (because they're never wrong):

http://wiki.musl-libc.org/wiki/FAQ#Q:_why_is_there_no_MUSL_macro_.3F

I've put this in after #include <errno.h>:

#if !defined(IPPORT_RESERVED) && !defined(__GLIBC__)
/*
 * could be using broken musl libc!
 * they refuse to identify themselves:
 * http://wiki.musl-libc.org/wiki/FAQ#Q:_why_is_there_no_MUSL_macro_.3F
 */
#include <netdb.h>
#endif
-- 
Hilsen Harald


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