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 diff -durN gcc-4.2.1.orig/libstdc++-v3/include/ext/rope gcc-4.2.1/libstdc++-v3/include/ext/rope
2 --- gcc-4.2.1.orig/libstdc++-v3/include/ext/rope 2006-10-17 13:56:21.000000000 +0200
3 +++ gcc-4.2.1/libstdc++-v3/include/ext/rope 2007-08-03 20:34:23.000000000 +0200
5 #include <bits/allocator.h>
6 #include <ext/hash_fun.h>
8 +/* cope w/ index defined as macro, SuSv3 proposal */
12 # define __GC_CONST const
14 diff -durN gcc-4.2.1.orig/libstdc++-v3/include/ext/ropeimpl.h gcc-4.2.1/libstdc++-v3/include/ext/ropeimpl.h
15 --- gcc-4.2.1.orig/libstdc++-v3/include/ext/ropeimpl.h 2006-10-17 13:56:21.000000000 +0200
16 +++ gcc-4.2.1/libstdc++-v3/include/ext/ropeimpl.h 2007-08-03 20:34:23.000000000 +0200
18 #include <ext/memory> // For uninitialized_copy_n
19 #include <ext/numeric> // For power
21 +/* cope w/ index defined as macro, SuSv3 proposal */
24 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)