Comment 24 for bug 1561621

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0e6f64d9d04a9a26a048d1fb1bf1ebdb6739c5af

commit 0e6f64d9d04a9a26a048d1fb1bf1ebdb6739c5af
Author: Andreas Schwab <email address hidden>
Date: Tue Aug 8 17:44:32 2017 +0200

    Add test for bug 21041

    (cherry picked from commit 40c06a3d0450365e9675fe26f34fc56ce8497325)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=06e775f4646f823cb858f50258bbe5a6f1e6bbe1

commit 06e775f4646f823cb858f50258bbe5a6f1e6bbe1
Author: Andreas Schwab <email address hidden>
Date: Wed Aug 9 10:36:08 2017 +0200

    Fix s390 version of pt-longjmp.c

    (cherry picked from commit 5797b410a87f6f6f6d3661d730fac320cbd5f270)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8182ccd9b8f9e6474712ddc904930e150f96da36

commit 8182ccd9b8f9e6474712ddc904930e150f96da36
Author: Andreas Schwab <email address hidden>
Date: Tue Aug 8 16:21:58 2017 +0200

    Don't use IFUNC resolver for longjmp or system in libpthread (bug 21041)

    Unlike the vfork forwarder and like the fork forwarder as in bug 19861,
    there won't be a problem when the compiler does not turn this into a tail
    call.

    (cherry picked from commit fc5ad7024c620cdfe9b76e94638aac83b99c5bf8)

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

Summary of changes:
 ChangeLog | 21 +++++++++++++
 nptl/Makefile | 6 ++-
 nptl/pt-longjmp.c | 31 ++++++-------------
 nptl/pt-system.c | 24 +++++----------
 .../lcong48.c => nptl/tst-compat-forwarder-mod.c | 10 ++++--
 .../tst-compat-forwarder.c | 23 ++++++--------
 sysdeps/unix/sysv/linux/s390/pt-longjmp.c | 4 +-
 7 files changed, 61 insertions(+), 58 deletions(-)
 copy stdlib/lcong48.c => nptl/tst-compat-forwarder-mod.c (77%)
 copy math/test-fe-snans-always-signal.c => nptl/tst-compat-forwarder.c (67%)