Re: EPICS INSTALL_LOCATION/FINAL_LOCATION doesn't work?

["J. Lewis Muir via Tech-talk" <tech-talk at aps.anl.gov>]

On 01/21, Johnson, Andrew N. wrote:
> I think your recipe needs to be something like I’ve shown below, which (after experimentation and carefully reading the Release Notes) works for me on a RHEL-8 system.

Hi, Andrew!

Thank you for taking a look at this!

> I suspect this doesn’t need LD_LIBRARY_PATH to be set at all though. The PYTHON=python3 setting is only necessary for RHEL-8 and above — EPICS builds only need python when you set LINKER_USE_RPATH=ORIGIN. I am planning to replace the Python script with Perl though (thanks Argo!).

Yeah, seems a shame to introduce a build-time dependency on Python for
one script when there's already a dependency on Perl, so thanks for
planning to change that!

> cswdev02% cat > configure/CONFIG_SITE.local
> INSTALL_LOCATION=/tmp/45/work
> FINAL_LOCATION=/tmp/45/opt/epics-7.0.8.1
> LINKER_USE_RPATH=ORIGIN
> LINKER_ORIGIN_ROOT=/tmp/45
> export LD_LIBRARY_PATH=$(INSTALL_LOCATION)/lib/$(EPICS_HOST_ARCH)
> PYTHON=python3
> ^D
> ...
> cswdev02% cd /tmp/45
> cswdev02% ldd work/bin/linux-x86_64/caget
>      linux-vdso.so.1 (0x00007ffcbc3dd000)
>      libca.so.4.14.4 => /tmp/45/work/bin/linux-x86_64/../../lib/linux-x86_64/libca.so.4.14.4 (0x00007f31e0ced000)
>      libCom.so.3.23.1 => /tmp/45/work/bin/linux-x86_64/../../lib/linux-x86_64/libCom.so.3.23.1 (0x00007f31e0a6f000)
> ...
> cswdev02% mv work opt/epics-7.0.8.1
> cswdev02% ldd opt/epics-7.0.8.1/bin/linux-x86_64/caget
>      linux-vdso.so.1 (0x00007fff2212b000)
>      libca.so.4.14.4 => /tmp/45/opt/epics-7.0.8.1/bin/linux-x86_64/../../lib/linux-x86_64/libca.so.4.14.4 (0x00007f30c97b6000)
>      libCom.so.3.23.1 => /tmp/45/opt/epics-7.0.8.1/bin/linux-x86_64/../../lib/linux-x86_64/libCom.so.3.23.1 (0x00007f30c9538000)
> ...

This is unfortunate because I was hoping to avoid using $ORIGIN.  (I'm
thinking about packaging, and at least one package management system,
pkgsrc, does not allow the use of $ORIGIN.)  It also seems to contradict
the comment for FINAL_LOCATION in configure/CONFIG_SITE:

----
# The location from which files placed in INSTALL_LOCATION will actually run.
# This path is compiled into executables, and so should be an absolute.
#  May be used to achieve the effect of autotools.  eg.
#   ./configure --prefix=<FINAL_LOCATION>
#   make DESTDIR=<INSTALL_LOCATION>
# Defaults to the absolute expansion of $(INSTALL_LOCATION)
FINAL_LOCATION=/Users/jlmuir/tmp/45/opt/epics-7.0.8.1
----

That comment doesn't say anything about needing to set
LINKER_USE_RPATH=ORIGIN.  Have things changed?

Michael wrote about DESTDIR-like support in 2020 in

  https://epics.anl.gov/core-talk/2020/msg01276.php

where he said:

> @Chris, if your tools complain about -rpath then use LINKER_USE_RPATH=NO
> and FINAL_LOCATION= and set $LD_LIBRARY_PATH in the environment.
> 
> FINAL_LOCATION being a rough analog of 'configure --prefix=...' in
> this context.  eg.
> 
>> export LD_LIBRARY_PATH==$PWD/lib/$EPICS_HOST_ARCH
>> make LINKER_USE_RPATH=NO FINAL_LOCATION=/usr/local/epics INSTALL_LOCATION=/tmp/staging

I was really hoping that that would work!

Lewis