[Bug build/20918] Building with --enable-nss-crypt fails tst-linkall-static.

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https://sourceware.org/bugzilla/show_bug.cgi?id=20918

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=84aa75162cd5ba73caa76864496fadd2551a5caa

commit 84aa75162cd5ba73caa76864496fadd2551a5caa
Author: Carlos O'Donell <carlos@systemhalted.org>
Date:   Fri Dec 2 15:39:09 2016 -0500

    Bug 20918 - Building with --enable-nss-crypt fails tst-linkall-static

    Some configurations may use NSS cryptographic routines but have no
    static library for those routines. The following changes allow glibc to
    be built and tested with --enable-nss-crypt, but without having a static
    NSS library. At a high level the change does two things:

    (1) Detect at configure time if static NSS crypto libraries are
        available.  Assumes libfreebl3.a (instead of the existing Fedora
        libfreebl.a which is incomplete) which matches libfreebl3.so.

    (2) If static NSS crypto libraries are _not_ available then adjust the
        way in which we build tst-linkall-static. This includes excluding a
        reference to crypt and not linking against libcrypt.a, all of which
        will fail otherwise.

    Testing assumptions:
    * Static library is named libfreebl3.a (not libfreebl.a as is currently
      provided in Fedora), matching libfreebl3.so shared link name.

    Tested on x86_64 on Fedora with:

    (a) --enable-nss-crypt, with no static NSS library support: PASS
        (previous FAIL)

    (b) --enable-nss-crypt, with faked static NSS library support: PASS
        (unsupported)
        * Requires changing elf/Makefile to include a stub
          /lib64/libfreebl3.a for testing purposes.

    (c) --disable-nss-crypt: PASS
        (default)

    No regressions on x86_64.

    For details see:
    https://www.sourceware.org/ml/libc-alpha/2016-11/msg00647.html

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

Summary of changes:
 ChangeLog                |   16 ++++++++++++++++
 config.make.in           |    1 +
 configure                |   29 +++++++++++++++++++++++++++++
 configure.ac             |   14 ++++++++++++++
 elf/Makefile             |   32 ++++++++++++++++++++++++++++++--
 elf/tst-linkall-static.c |    2 ++
 6 files changed, 92 insertions(+), 2 deletions(-)

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