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U-boot Standalone Examples - Hello_world.c

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  U-boot Standalone Examples - Hello_world.c Ilias Abrams <iliasabrams@gmail.com> - 2018-03-28 11:23 -0700
    Re: U-boot Standalone Examples - Hello_world.c Wouter Verhelst <w@uter.be> - 2018-03-29 16:34 +0200

#8578 — U-boot Standalone Examples - Hello_world.c

Hi guys, 

I was looking into the standalone example (hello_world) 
that U-boot repository contains and builds when you build and compile U-boot. 

It has those two libraries at the top, and I was wondering, 
where the program finds those libraries? Where those headers located? 
There are not into the U-boot directory. 
A Makefile defines where the compiler will find the header? 
I am a newbie in C programming so, I am trying with simple examples to 
understand how the compiler works and combine the headers with .c program. 

#include <common.h> 
#include <exports.h> 

Thanks! 

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#8589

On 28-03-18 20:23, Ilias Abrams wrote:
> Hi guys, 
> 
> I was looking into the standalone example (hello_world) 
> that U-boot repository contains and builds when you build and compile U-boot. 
> 
> It has those two libraries at the top, and I was wondering, 
> where the program finds those libraries? Where those headers located? 

For clarity, "header files" and "libraries" are not the same thing. A
header file is meant to contain function declarations, constants, and
macros that a programmer may be able to use in a program. A library is a
body of compiled code that a program may link to.

> There are not into the U-boot directory. 
> A Makefile defines where the compiler will find the header? 

Usually, the build system (which may, but is not required to be, a
Makefile) will indeed have to define where such headers are to be found.

Most compilers accept a "-I" argument to pass extra include paths to the
preprocessor; if you search the Makefile for such options, you should be
able to figure out where the header files in question are to be found.

Regards,

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