On 8/9/2013 10:15 AM, Deng Hengyi wrote: > Hi all, > > does anyone know how to configure gcc to build with > "__atomic_compare_exchange_n" support for i386 target?
I recall that one issue with *-rtems* targets is that we support CPU models which are lower than typically used on Linux and BSD systems. I recall that CPU models like the mc68000 and i386 don't necessarily have the atomic instructions available in later models like the mc68040 or i686. My suggestion is to see specifically how that is implemented on the other CPU models and which models don't have implementations. Then we can figure out how to implement it. For lower model CPUs, it should be safe to assume they will never be seen in SMP systems and using a generic RTEMS providing implementation that disables interrupts and does the operation is OK. --joel > WeiY > Best Regards > 在 2013-8-6，下午11:37，Jonathan Wakely <jwakely....@gmail.com> 写道： > >> On 6 August 2013 16:30, Deng Hengyi wrote: >>> Hi Jonathan, >>> >>> Thank you for your reply. >>> And about the error i encounter, do you have any advice? maybe it is caused >>> by my toolchain not install rightly? >>> In the standard pc686 architecture(not cross compile on RTEMS) will it >>> encounter the similar error? >> I don't know anything about the RTEMS port. You might need to build >> and link to libatomic, but I don't know. -- Joel Sherrill, Ph.D. Director of Research & Development joel.sherr...@oarcorp.com On-Line Applications Research Ask me about RTEMS: a free RTOS Huntsville AL 35805 Support Available (256) 722-9985
