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* configure.ac: Set ABI_TWEAKS_SRCDIR. * configure.host: Set abi_tweaks_dir. Check for atomicity.h when setting atomicity_dir. Override type_cpu for arm based targets. * include/Makefile.am (host_headers): Add cxxabi_tweaks.h. * libsupc++/cxxabi.h: Include bits/cxxabi.h. Don't declare __guard. * libsupc++/guard.cc: Use definitions from cxxabi_tweaks.h. * libsupc++/vec.cc: Ditto. * config/cpu/arm/cxxabi_tweaks.h: New file. * config/cpu/generic/cxxabi_tweaks.h: New file. * */Makefile.in: Regenerate. * configure: Regenerate. From-SVN: r84032