scripts, cc/gcc: do not fail on existing symlinks or build.log
If the user builds a toolchain over an existing one, so, without removing
CT_PREFIX_DIR, the build fails as the symlinks already exist, as does the
build.log.
This can also happen (for build.log) if the user first ran in download-
or extract-only.
Patch (with no SoB) originally from:
Phil Wilshire <phil.wilshire@overturenetworks.com>
Modified by me as it did not apply cleanly.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from 1ebc2248cc60230cd53ff94ae8f8f1e3261461a3)
1 2008-04-28 Hiroki Kaminaga <kaminaga@sm.sony.co.jp>
4 nptl/sysdeps/powerpc/tcb-offsets.sym (PRIVATE_FUTEX_OFFSET):
5 Guard sym definition with #ifndef __ASSUME_PRIVATE_FUTEX.
7 --- a/nptl/sysdeps/powerpc/tcb-offsets.sym
8 +++ b/nptl/sysdeps/powerpc/tcb-offsets.sym
10 PID thread_offsetof (pid)
11 TID thread_offsetof (tid)
12 POINTER_GUARD (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t))
13 +#ifndef __ASSUME_PRIVATE_FUTEX
14 PRIVATE_FUTEX_OFFSET thread_offsetof (header.private_futex)