Update the architecture API: architecture help is mandatory.
Update all architectures (some with pointer to the specs, when available).

/trunk/docs/overview.txt | 8 8 0 0 ++++++++
/trunk/arch/arm/config.in | 3 3 0 0 +++
/trunk/arch/powerpc/config.in | 3 3 0 0 +++
/trunk/arch/ia64/config.in | 3 3 0 0 +++
/trunk/arch/alpha/config.in | 2 2 0 0 ++
/trunk/arch/x86/config.in | 3 3 0 0 +++
/trunk/arch/mips/config.in | 3 3 0 0 +++
/trunk/arch/sh/config.in | 3 3 0 0 +++
/trunk/arch/x86_64/config.in | 3 3 0 0 +++
9 files changed, 31 insertions(+)

diff -durN gcc-4.2.1.orig/boehm-gc/include/gc.h gcc-4.2.1/boehm-gc/include/gc.h

--- gcc-4.2.1.orig/boehm-gc/include/gc.h	2006-09-18 20:45:08.000000000 +0200

+++ gcc-4.2.1/boehm-gc/include/gc.h	2007-08-03 20:33:00.000000000 +0200

@@ -502,7 +502,7 @@

 #if defined(__linux__) || defined(__GLIBC__)

 # include <features.h>

 # if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1 || __GLIBC__ > 2) \

-     && !defined(__ia64__)

+     && !defined(__ia64__) && !defined(__UCLIBC__)

 #   ifndef GC_HAVE_BUILTIN_BACKTRACE

 #     define GC_HAVE_BUILTIN_BACKTRACE

 #   endif