Re: Patch for Makefile to improve linkability of the kernel
H. Peter Anvin (hpa@transmeta.com)
14 Dec 1998 14:03:25 GMT
Followup to: <Pine.BSF.3.96.981214110419.13272C-100000@toad.stack.nl>
By author: Arjan van de Ven <arjan@stack.nl>
In newsgroup: linux.dev.kernel
>
> Description of the problem
> --------------------------
> Several of the Linux-kernel .a files have dependencies among them. The "ld"
> program (in normal operation) only links the symbols in an .a file that
> where previously unresolved. This is a problem when a symbol is needed in an
> .a file that is linked _after_ the current file. (For example, drivers/net/net.a
> is linked before drivers/cdrom/cdrom.a, cdrom.a uses auto_irq from it but
> drivers/net/net.a does not provide it if it is not used before).
>
> The solution
> ------------
> One way of solving this kind a stuff is to modify the linking order. This is
> uggly and even circular dependencies might exist. the "--start-group ....
> --end-group" aproach seems like a clean, tool-based solution:
>
A much better idea is to use ld -r and use .o files instead of .a
files.
-hpa
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