[U-Boot-Users] STD_C and STDC_
Wolfgang Denk
wd at denx.de
Wed Dec 13 20:31:57 CET 2006
In message <457F6D37.0000CE.20237 at 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_).
Your lines are too long. Please make sure to restrict your line
length to 70 characters or so.
> 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.
> --Boundary-=_CBfWamzZMGvDFyxcltoAEydEtpOl
> Content-Type: text/html; charset="gb2312"
> Content-Transfer-Encoding: quoted-printable
And please don't post HTML here.
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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