Folks, Boost 1.40.0 beta 1 fail to build on SPARC64 machines. 1.37, however, builds flawlessly. Brief analysis indicates that the issue arises when code of smart_ptr is assembled. The "boost/smart_ptr/detail/sp_counted_base_gcc_sparc.hpp" file contains SPARC-specific assembly for atomic compare-and-swap implementation and assembler rejects the code generated by the compiler out of that function. The generated code contains a "cas" instruction where first operand is a memory reference with complex addressing (register and offset). According to the SPARC v9 manual only register containing stored address may go there. Environment: "uname -a": FreeBSD boost 8.0-BETA4 FreeBSD 8.0-BETA4 #4: Tue Sep 15 14:03:28 UTC 2009 boris@poly-e450-1:/usr/obj/usr/src/sys/E450 sparc64 "c++ --version": c++ (GCC) 4.2.1 20070719 [FreeBSD] "as --version": GNU assembler 2.15 [FreeBSD] 2004-05-23 The attached patch allows the code to build. What is the appropriate way to check that the patched code works correctly both in terms of logic and atomicity? Alexander Churanov maintainer of devel/boost-* ports for FreeBSD