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Qemu's tools like qemu-img are often needed on 32-bit platforms, although the actual qemu emulators have been discontinued on 32-bit. To allow building the tools on 32-bit this patch implements three small changes: a) The check in meson.build is changed to still error out if the user tries to build qemu-system or qemu-user on a 32-bit platform, but allows building tools (e.g. by "--enable-tools") alone. b) The compile time check in atomic.h now checks against sizeof(uint64_t) so that 32-bit environments can still build successfully, while 128-bit atomic operations are prevented to sneak in. c) Allow linking against libatomic as long as we don't build the qemu-system and qemu-user binaries. Sucessfully tested on the 32-bit big-endian powerpc architecture. Signed-off-by: Helge Deller <deller@gmx.de> Suggested-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Michael Tokarev <mjt@tls.msk.ru> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>