Re: Best practice for linking against libatomic?

* Simon Richter:

> Hi,
>
> On 1/12/26 11:59 PM, Florian Weimer wrote:
>
>> It would be interesting to know which functionality needs libatomic.
>> What are the linker errors you encountered?
>
> Missing symbols, the ones in the build logs I have are:
>
>  - __atomic_exchange_1
>  - __atomic_fetch_add_2
>  - __atomic_compare_exchange_1
>
> There are a few weird ones, like
>
> /usr/bin/ld: /tmp/ccXOVIUZ.ltrans0.ltrans.o: undefined reference to
> symbol '__atomic_exchange_1@@LIBATOMIC_1.0'
>
> so for LTO, there seems to be an error path that can find the version,
> but then does not resolve the symbol -- these are fairly seldom
> though.

I think those call should never happen if you are targeting CPUs with
the A extension.  If you are not doing that, some parts of the build are
misconfigured.

Thanks,
Florian