Hello when I study arnlinux ,I find the word __ARM_ARCH_2__.I know it is defined by gcc. I know it may be preprocessor symbol(macros). but I can't find something about __ARM_ARCH_2__ in gcc manual. so I writte to you I want to know something about __ARM_ARCH_*__. which manual I can find __ARM_ARCH_*__ in . thank you xvzhaobin
