dynamic linker in RTEMS 5 ?

[Chris Johns]

On 22/12/2017 08:34, Joel Sherrill wrote:
> On Dec 21, 2017 3:04 PM, "Till Straumann" <strauman at slac.stanford.edu
> <mailto:strauman at slac.stanford.edu>> wrote:
>     On 12/20/2017 02:46 PM, Chris Johns wrote:
>         On 21/12/17 2:22 am, Till Straumann wrote:
>             I think it would not be very difficult to add support for dlopen to
>             cexpsh.
> 
>         Great. Is there a public repo with the latest code?
> 
>     https://github.com/till-s/cexpsh <https://github.com/till-s/cexpsh>

Thanks.

>         Can just the cexp part be brought into RTEMS under say libmisc?
> 
>     In principle, yes, but I'd think it might be more useful if we add
>     support for loading modules via dlopen (under linux this already works
>     but I'd expect RTEMS' variant to differ; in particular I'm using dlinfo
>     and dl_iterate_phdr, i.e., some sort of inspection is required).

We do not support dl_iterate_phdr and I am not sure what is present in dlinfo.

The support under the dlopen family of calls may not be exactly the same as
Linux or Unix as we do not need to followed the sharing model. We should be
following what the standard says.

>         Looking at the a github repo I see regexp, getopt, and libtecla. Do we
>         need all
>         of these?
> 
>     Some of them (libtecla) can be configured away (but it's not a good idea
>     since it affects the user experience). All of the libraries should have
>     benign licensing.
> 

I am fine with libtecla being in libmisc, the standard RTEMS may benefit from it.

Why is there a regexp library?

> I started adding these to the RSB as add-on libraries. There is a ticket which
> captures my progress. 
OK.

> We need to be careful about the dependencies required to build RTEMS itself.
> This may be better as an RSB kit.

Joel, which dependences are you thinking of?

Chris