Experimental Physics and
Industrial Control System

"Dmitry Yu. Bolkhovityanov via Tech-talk" <tech-talk at aps.anl.gov> · Tue, 9 May 2023 11:45:54 +0700 (+07)

Michael,

On Sun, 7 May 2023, Michael Davidsaver wrote:

On 5/6/23 23:12, Dmitry Yu. Bolkhovityanov via Tech-talk wrote:

 P.S. Yes, I'm aware of a "COMMANDLINE_LIBRARY=EPICS" flag (which took some
 time to figure out :D), but the question remains -- why any commandline
 editing is needed for network communication libraries at all?

This is a side-effect of the convention we use to support both dynamic and

static linking

with one configuration. Since static libraries do not carry dependency

information, when

linking statically it is necessary to give a complete list of all dependent

libraries

when linking any executable. This includes libreadline when libCom depends

on it.

One simple way to avoid this over-linking in the dynamic case by passing

"-Wl,--as-needed"

when linking.

(assumes GCC or clang on an ELF target)

Thanks for this -- I didn't know of this linker option!

However, I still don't understand: why libCom depends on libreadline (or

any commandline-editing library)?

With best regards,
Dmitry

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System