rsync - Jul 2014 - [Bug 10715] New: IPv6 configure test fails on musl c-library

https://bugzilla.samba.org/show_bug.cgi?id=10715

           Summary: IPv6 configure test fails on musl c-library
           Product: rsync
           Version: 3.1.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: timo.teras at iki.fi
         QAContact: rsync-qa at samba.org


The autoconfigure tests for IPv6 relies on C-library internals, and it
currently fails for musl c-library based linux. For Alpine Linux bug report see
http://bugs.alpinelinux.org/issues/3158.

A better test (and non-OS dependent) would be to try creating AF_INET6 socket,
if it succeeds, then IPv6 is supported.

See e.g.:

http://ftp.netbsd.org/pub/NetBSD/NetBSD-release-6/src/crypto/dist/ipsec-tools/configure.ac
(and search for --disable-ipv6)

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https://bugzilla.samba.org/show_bug.cgi?id=10715

Pierre-Olivier Mercier <nemunaire at nemunai.re> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nemunaire at nemunai.re

--- Comment #1 from Pierre-Olivier Mercier <nemunaire at nemunai.re> ---
Created attachment 13546
  --> https://bugzilla.samba.org/attachment.cgi?id=13546&action=edit
Proposed patch to fix the issue

Please find attached a proposal patch following Timo's suggestion: I replace
the long specific C library detection (which in our case forgot musl's
users)
by a single feature test that all C libraries have to implement in order to
have a compiling rsync with IPv6 support.

After applying this patch, I was able to compile an IPv6 ready rsync with musl,
while keeping the same behaviour with the glibc under Linux. This should be
tested against others libc I don't have access to.

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