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+[[!meta copyright="Copyright © 2012, 2013 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+Things to consider regarding *versioning*.
+
+The provider and user of any interface need to agree about how to interpret the
+data being exchanged. Internal-only interfaces can be changed easily, because
+you can change the provider and user at the same time. Interfaces that are
+exposed externally require more attention, for obvious reasons. To *change*
+interfaces means to either remove, or add, or modify an existing interface.
+Modify basically means to remove and then re-add a variant, re-using the former
+name/identifier.
+
+
+# [[RPC]]s
+
+## [[microkernel/mach/message/msgh_id]]
+
+
+# Shared Libraries
+
+ * [[!wikipedia soname]]
+ * ELF symbol versioning
+ * [[!wikipedia "GNU Libtool"]]
+
+
+## Hurd
+
+Transition to "normal" ELF symbol versioning/libtool?
+
+For all libraries, the SONAME is currently set to *0.3*. [[!message-id
+desc="Not changed" "87ob7cxbu6.fsf@kepler.schwinge.homeip.net"]] when doing the
+[[Hurd 0.5 release|news/2013-09-27]].
+
+
+## glibc
+
+Bump the glibc SONAME to some point, or can do everything with symbol
+versioning?
+
+
+### IRC, freenode, #hurd, 2012-12-14
+
+[[!tag open_issue_glibc open_issue_libpthread]]
+
+In context of [[packaging_libpthread]]/[[libpthread]].
+
+ <pinotree> once libc is switched internally from cthreads to pthreads (thus
+ breaking its BC), may be worth cleanup the hurd-specific exported symbols
+ <tschwinge> pinotree: Yes. If you already have ideas about what to clean
+ up, feel free to add a new page or a section on open_issues/glibc.
+ <pochu> we're gonna break backwards compatibility in glibc on hurd? that
+ could be the perfect moment to fix the /dev/fd/N problem without adding
+ new RPCs, though we'd probably have to break backwards-compatibility in
+ the exec server IIRC...
+ <tschwinge> pochu: Oh, I have to re-read that discussion, but thanks for
+ reminding!
+
+[[!GNU_Savannah_bug 28934]], [[user/pochu]], [[!message-id
+"4BFA500A.7030502@gmail.com"]].