[Bug malloc/20432] malloc: Minimize interface required for interposition

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https://sourceware.org/bugzilla/show_bug.cgi?id=20432

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ef4f97648dc95849e417dd3e6328165de4c22185

commit ef4f97648dc95849e417dd3e6328165de4c22185
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Aug 26 22:40:27 2016 +0200

    malloc: Simplify static malloc interposition [BZ #20432]

    Existing interposed mallocs do not define the glibc-internal
    fork callbacks (and they should not), so statically interposed
    mallocs lead to link failures because the strong reference from
    fork pulls in glibc's malloc, resulting in multiple definitions
    of malloc-related symbols.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                              |   34 ++++
 include/libc-symbols.h                 |   15 ++
 malloc/Makefile                        |   27 +++-
 malloc/tst-interpose-aux-nothread.c    |   20 +++
 malloc/tst-interpose-aux-thread.c      |   20 +++
 malloc/tst-interpose-aux.c             |  270 ++++++++++++++++++++++++++++++++
 malloc/tst-interpose-aux.h             |   30 ++++
 malloc/tst-interpose-nothread.c        |   20 +++
 malloc/tst-interpose-skeleton.c        |  204 ++++++++++++++++++++++++
 malloc/tst-interpose-static-nothread.c |   19 +++
 malloc/tst-interpose-static-thread.c   |   19 +++
 malloc/tst-interpose-thread.c          |   20 +++
 nptl/tst-tls3-malloc.c                 |  156 +------------------
 sysdeps/mach/hurd/fork.c               |    6 +-
 sysdeps/nptl/fork.c                    |    6 +-
 15 files changed, 706 insertions(+), 160 deletions(-)
 create mode 100644 malloc/tst-interpose-aux-nothread.c
 create mode 100644 malloc/tst-interpose-aux-thread.c
 create mode 100644 malloc/tst-interpose-aux.c
 create mode 100644 malloc/tst-interpose-aux.h
 create mode 100644 malloc/tst-interpose-nothread.c
 create mode 100644 malloc/tst-interpose-skeleton.c
 create mode 100644 malloc/tst-interpose-static-nothread.c
 create mode 100644 malloc/tst-interpose-static-thread.c
 create mode 100644 malloc/tst-interpose-thread.c

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