[En-Nut-Discussion] Unable to compile 'simple': circular references between libraries

[Henrik Maier]

Hi!

I had similar linker issues with various Nut/OS projects.

The gcc linker cannot resolve circular references between libraries. 
Depending on the Nut/OS functions used in a project, I found one always 
has to reorder libraries and add them multiple times.

I suggested in an earlier post to drop the concept of splitting Nut/OS 
in separate libraries and just to have one library libnutosall.a.

Another option is to embed the libraries in start-group/end-group linker 
options. gcc will then search the libraries multiple times to resolve 
circular references between libraries. For example:

-Wl,--start-group -lnutpro -lnutos -lnutarch -lnutdev -lnutnet -lnutfs 
-lnutcrt -Wl,--end-group

Henrik Maier
http://www.proconx.com


Lloyd Bailey wrote:
> Hi,
> 
> I had the same problem, so I re-ordered the libraries (swopped  nutdev
> and nutarch and add nutdev at the end.
> 
> I hope this helps,
> 
> Lloyd.
>