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long __int40_t 数据大小问题



本人使用的编译器版本为7.4.4,数据手册上说在coff格式下long的大小为40bits,在elf格式下long为32bits,__int40_t为40bits,但是我在两种格式下编译后用sizeof查看的数据大小均为32bits,这是为什么呢?