Re: How to make section take no space in output file?

["H.J. Lu" <hjl at lucon dot org>]

On Fri, Jan 11, 2008 at 02:11:31PM -0800, Rick Mann wrote:
>
> On Jan 11, 2008, at 12:43 PM, DJ Delorie wrote:
>
>>
>> If they're memory mapped devices, I think a better approach is to make
>> them "extern" in your C program, and assign them values in the linker
>> script or an auxiliary asm file, like this:
>>
>>        .global framebuffer
>> framebuffer = 0xc8000000
>>
>> If your C sources create data, the linker has to put it somewhere.
>> The solution is to not create data.
>>
>> You could also try the DISCARD section, but whether it's useful or not
>> depends on your specific situation.
>
> They are not memory-mapped devices; they're strictly allocated RAM. The 
> only requirement is that they be of specific size and alignment, and I'd 
> like for the linker to just assign addresses accordingly. However, in the 
> output file, they don't need to exist at all; I just want references to the 
> symbols to have the right values at run time.

Have you tried "NOLOAD"? See

http://www.sourceware.org/bugzilla/show_bug.cgi?id=5522

However, this feature may a bug in linker:

http://sourceware.org/ml/binutils/2008-01/msg00083.html



H.J.