[Bug libc/15648] Support building glibc with -flto.

["knrstaj at gmail dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15648

--- Comment #6 from Neil <knrstaj at gmail dot com> ---
Created attachment 7086
  --> http://sourceware.org/bugzilla/attachment.cgi?id=7086&action=edit
multiple definition of `__lll_lock_wait_private' example2

I don't want to build glibc with -flto option.
I build application with -flto.

The problem is like building thread program which static link with -lc
-lpthread

For example:
gcc thread_program.c -lc -lpthread -static
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libpthread.a(lowlevellock.o):
In function `__lll_lock_wait_private':
/build/buildd/eglibc-2.15/nptl/../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:76:
multiple definition of `__lll_lock_wait_private'
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libc.a(libc-lowlevellock.o):(.text+0x0):
first defined here
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libpthread.a(lowlevellock.o):
In function `__lll_unlock_wake_private':
/build/buildd/eglibc-2.15/nptl/../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:332:
multiple definition of `__lll_unlock_wake_private'
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libc.a(libc-lowlevellock.o):(.text+0x30):
first defined here
collect2: ld returned 1 exit status

But, I don't know why -flto causes the problem for my first example. :(

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