[patch] use of atomic builtins for arm-linux-eabi in boehm-gc

[Richard Earnshaw]

> Current trunk fails to build on arm-linux-gnueabi in boehm-gc, when
> configured
> --with-mode=thumb:
> 
> /tmp/ccVpqOWm.s: Assembler messages:
> /tmp/ccVpqOWm.s:1160: Error: selected processor does not support `swp
> r3,r3,[r2]'
> /tmp/ccVpqOWm.s:2472: Error: selected processor does not support `swp
> r3,r3,[r2]'
> /tmp/ccVpqOWm.s:3232: Error: selected processor does not support `swp
> r3,r3,[r2]'
> make[5]: *** [alloc.lo] Error 1
> 
> arm-linux-gnueabi now provides the atomic builtins; use them
> unconditionally (as
> libjava does).
> 
> Ok for the trunk, if testing succeeds? The build on trunk configured
> with
> --with-mode=thumb fails for other reasons (PR42093), currently testing
> the patch
> for the 4.4 branch.
2009-12-09  Matthias Klose  <doko@ubuntu.com> 

	* include/private/gc_locks.h: For __ARM_EABI__ define
	GC_test_and_set  GC_clear to use the atomic builtins.

OK for trunk once testing is complete.

Please also notify the upstream maintainer of boehm-gc, or this patch may
get lost in a future merge.

R.