Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Sun, 14 Aug 2022 21:24:50 -0700

On 8/12/22 08:27, Pierrick M Hanlet via Tech-talk wrote:

Hi,
I'm using v7.0.5.1 with buildroot to build for several platforms. The
build is done in a /scratch
area, but I'd like the -Wl,-rpath, to point to /usr/local.  I believe
that I found the documentation
for it, namely:
https://epics-base.github.io/epics-base/releasenotes.html, but it's not
clear to me
that I'm doing things correctly; it's certainly not changing my rpath at
link time.

LINKER_USE_RPATH=ORIGIN
LINKER_ORIGIN_ROOT=/scratch/products

Are you setting $(INSTALL_LOCATION) as well?

If so, then you should set LINKER_ORIGIN_ROOT=$INSTALL_LOCATION
(which is the default), or a parent of $INSTALL_LOCATION .

If not, do you see any errors from makeRPath.py?

eg. https://github.com/epics-base/epics-base/blob/424d678abff19887cd2fa9ff5af82e33806a3712/src/tools/makeRPath.py#L61

For a working example see:

https://github.com/mdavidsaver/build-epics/blob/d70458fa0f15fb444954a55afa9d284f8e5fbcac/build-epics.sh#L47

With these in CONFIG_SITE, I'm expecting -Wl,-rpath,/scratch/products to
change to -Wl,-rpath,$ORIGIN

which I can then define as I'd like.

I'm a little confused by this.  In the context of
"-rpath", "$ORIGIN" is not an environment variable.
This isn't something you set explicitly.  Rather
"$ORIGIN" is computed automatically by the runtime
linker based on the directory containing an executable
or shared library.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System