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汇编头文件,条件编译?



请教大哥们一个问题呢!

     我做了一个汇编头文件"asm.h64", 想像C语言头文件一样有防重编译,加了如下代码。总是报错,不知道怎么回事?

.if $isdefed("_asmh64")=0     ; 如果没有定义
.defined 45,_asmh64             ;总是报错,提示非法字符。 我已经怎么改呢??

;$defined("_asmh64")            ;用这个也不的行

......................

.endif