[Bug math/19822] libm.so install clobbers old version

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https://sourceware.org/bugzilla/show_bug.cgi?id=19822

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ab98aad2867140c24abaea4c6c7164c490e251f3

commit ab98aad2867140c24abaea4c6c7164c490e251f3
Author: Dylan Alex Simon <dylan-sourceware@dylex.net>
Date:   Tue Mar 15 13:20:01 2016 -0400

    math: don't clobber old libm.so on install [BZ #19822]

    When installing glibc (w/mathvec enabled) in-place on a system with
    a glibc w/out mathvec enabled, the install will clobber the existing
    libm.so (e.g., /lib64/libm-2.21.so) with a linker script.  This is
    because libm.so is a symlink to libm.so.6 which is a symlink to the
    final libm-2.21.so file.  When the makefile writes the linker script
    directly to libm.so, it gets clobbered.

    The simple patch below to math/Makefile fixes this.  It is based on
    the nptl Makefile, which does exactly the same thing in a safer way.

    (cherry picked from commit f9378ac3773ffe998a2b3406568778ee9f77f759)
    (cherry picked from commit 73f158cef52f3968e0b9a7785638cf1737c35306)

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Summary of changes:
 math/Makefile |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

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