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 Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.1/uclibc/90_all_304-index_macro.patch
2 diff -durN gcc-4.3.1.orig/libstdc++-v3/include/ext/rope gcc-4.3.1/libstdc++-v3/include/ext/rope
3 --- gcc-4.3.1.orig/libstdc++-v3/include/ext/rope 2008-01-31 19:44:55.000000000 +0100
4 +++ gcc-4.3.1/libstdc++-v3/include/ext/rope 2008-06-10 14:59:02.000000000 +0200
7 #include <tr1/functional>
9 +/* cope w/ index defined as macro, SuSv3 proposal */
13 # define __GC_CONST const
15 diff -durN gcc-4.3.1.orig/libstdc++-v3/include/ext/ropeimpl.h gcc-4.3.1/libstdc++-v3/include/ext/ropeimpl.h
16 --- gcc-4.3.1.orig/libstdc++-v3/include/ext/ropeimpl.h 2007-05-04 17:06:46.000000000 +0200
17 +++ gcc-4.3.1/libstdc++-v3/include/ext/ropeimpl.h 2008-06-10 14:59:02.000000000 +0200
19 #include <ext/memory> // For uninitialized_copy_n
20 #include <ext/numeric> // For power
22 +/* cope w/ index defined as macro, SuSv3 proposal */
25 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)