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 This is backported partially from 2.20 branch
3 http://sourceware.org/ml/binutils-cvs/2009-10/msg00173.html
6 Index: binutils-2.20/gas/as.h
7 ===================================================================
8 --- binutils-2.20.orig/gas/as.h 2009-10-22 00:27:08.700469349 -0700
9 +++ binutils-2.20/gas/as.h 2009-10-22 00:28:04.068416318 -0700
10 @@ -238,7 +238,7 @@ typedef addressT valueT;
11 #define know(p) gas_assert(p) /* Verify our assumptions! */
12 #endif /* not yet defined */
14 -#define know(p) /* know() checks are no-op.ed */
15 +#define know(p) do {} while (0) /* know() checks are no-op.ed */