Is there a way to build a program without stdlib linked to it?

Is there a way to build a program without stdlib linked to it?

[William Tambe]

When I build a program ommiting:
#include <stdio.h> or
#include <stdlib.h>

I get message such as:
implicit declaration of built-in function 'printf' or 'malloc'

Is there a way to build my program in a way that an error such as symbol 
not found is generated instead of gcc linking agains stdlib?

Please let me know.

Re: Is there a way to build a program without stdlib linked to it?

[me22]

On Tue, May 13, 2008 at 10:51 PM, William Tambe <tambewilliam@gmail.com> wrote:
>  I get message such as:
>  implicit declaration of built-in function 'printf' or 'malloc'
>
>  Is there a way to build my program in a way that an error such as symbol
> not found is generated instead of gcc linking agains stdlib?
>

I'm fairly sure that omitting is legal, in C89, so long as the
signature works out.

It might not be in C99 though, so you could try -std=c99 -pedantic

If that doesn't work either, you could always use C++ instead :P

Re: Is there a way to build a program without stdlib linked to it?

[Tim Prince]

William Tambe wrote:
> When I build a program ommiting:
> #include <stdio.h> or
> #include <stdlib.h>
>
> I get message such as:
> implicit declaration of built-in function 'printf' or 'malloc'
>
> Is there a way to build my program in a way that an error such as 
> symbol not found is generated instead of gcc linking agains stdlib?
>
You want to cause just those functions to go missing at link time?  On 
most platforms, you could strip functions out of the libraries which are 
linked automatically by gcc. It's outside the realm of gcc, unless those 
are builtins present in libgcc.

Re: Is there a way to build a program without stdlib linked to it?

[Ian Lance Taylor]

William Tambe <tambewilliam@gmail.com> writes:

> When I build a program ommiting:
> #include <stdio.h> or
> #include <stdlib.h>
>
> I get message such as:
> implicit declaration of built-in function 'printf' or 'malloc'
>
> Is there a way to build my program in a way that an error such as
> symbol not found is generated instead of gcc linking agains stdlib?

See the -nostdlib and -nodefaultlibs options.

Ian