Can rtems4.11-gcc compile rtems-4.10?

[薛飞]

Hi all,
Someone can tell me how to use rtems4.11-gcc to compile rtems-4.10? Now,
i have rtems4.11 toolchains and rtems4.10 source code,
i want to use the toolchain to compile the code, i configured the
target=xxxx-rtems4.11, but fail. Thanks!