In message 457F6D37.0000CE.20237@bj163app22.163.com you wrote:
Everyone,I was reading the U-boot of the mpc8260 in recent months. And I was a freshman. Yesterday,When I was reading the U-boot1.1.4\include\malloc.h, I was puzzled by the ln223 and the ln224 (#ifndef _STD_C #ifdef _STDC_).
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I don't understand the differeces between the "_STD_C" and "_STDC_".Could anyone can help me?
The difference is in the order of the last two characters. In your first string, the 'C' is preceeded by the '_', while in the second string the 'C' is followed by the '_'.
But I have to admit that I see no relation of this question to actual U-Boot code, since neither of these strings is used in U-Boot. Also, only one of the lines you referred to is a '#ifdef' statement; the other one is a '#define' instead.
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Best regards,
Wolfgang Denk