[U-Boot-Users] -nostdinc

[Andrew Wozniak <awozniak@mc.com>]

Thanks for the kind reply.

Wolfgang Denk wrote:
> In message <422E60FD.50108@mc.com> you wrote:
> 
>>Having lots of fun with U-boot on our custom PPC440GX board. We're also 
>>pretty far along on developing a loadable "u-boot application" for this 
>>board.
> 
> Congrats :-)
> 
>>I've noticed that -nostdinc is used for many of the compiles. When I 
> 
> It should be used for _all_ compiles of files that  get  linked  into
> the U-Boot image. Please point out if we're missing any (of course it
> is  NOT  used  for  any  tools that will run on the host system, like
> mkimage etc.).

I haven't seen any yet.

>>attempted to include stdlib.h and atoi() in our application, the 
>>compiler could not find the file.
> 
> That's a good thing as it prevented you to do a stupind thing ;-)
> 
>>Further examination of the U-Boot code-base shows little or no use of 
>>stdlib.h. Is this to keep the overall binary size to a minimum?
> 
> It is to  make  U-Boot  self-contained,  i.  e.  independent  of  any
> external libraries etc.

That's a good thing.

>>Any other reason for not adding this library to build? One simple 
> 
> Yes. You don;t need it.
> 
>>alternative is to include our own atoi() source code.
> 
> Don't reinvent the wheel. Don't bloat the code by multiple  implemen-
> tations of the same function. Use simple_strtoul() instead.

Ahhh, I was wondering how U-Boot handled this common task. I didn't look 
far enough.

> Best regards,
> 
> Wolfgang Denk
>