Re: another problem with multiple SNL

[Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>]

You need to add this line to the start of your state program so that global symbols do not conflict. 

option +r;

Here is a real-world example:

https://github.com/epics-modules/measComp/blob/0db360662e2d578c12de203adf1ea29eec416d47/measCompApp/src/USBCTR_SNL.st#L11

Mark

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From: Dariush Hampai <dariush.hampai at lnf.infn.it>
Sent: Tuesday, February 3, 2026 10:36 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Cc: Mark Rivers <rivers at cars.uchicago.edu>; Maurizio M. <maurizio.montis at lnl.infn.it>
Subject: another problem with multiple SNL

 

Dear Community;
I'm trying to make three different state machine (SNL) in the same IOC.
The st.cmd is
< envPaths

cd "${TOP}"

## Register all support components
dbLoadDatabase "dbd/scan.dbd"
scan_registerRecordDeviceDriver pdbbase

## Load record instances
dbLoadRecords("db/scan.db","user=xena,server=xlabsrv2")
dbLoadRecords("db/scan.db","user=rxr,server=xlabsrv2")
dbLoadRecords("db/scan.db","user=cts,server=xlabsrv2")
#dbLoadTemplate("db/scan.val","user=xlabsrv2")

cd "${TOP}/iocBoot/${IOC}"
iocInit

## Start any sequence programs
seq xena_sncscan,"user=xena,server=xlabsrv2"
seq rxr_sncscan,"user=rxr,server=xlabsrv2"
seq cts_sncscan,"user=cts,server=xlabsrv2"

so it should be run three different SNLs. In one server it works
properly, however in a different server during the make I receive this
error message:

/usr/bin/ld:
rxr_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x86_64/../rxr_sncscan.stt:25:
multiple definition of `detector_files';
xena_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x./xena_sncscan.stt:25:
first defined here
/usr/bin/ld:
rxr_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x86_64/../rxr_sncscan.stt:26:
multiple definition of `detector_paths';
xena_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x./xena_sncscan.stt:26:
first defined here
/usr/bin/ld:
cts_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x86_64/../cts_sncscan.stt:25:
multiple definition of `detector_files';
xena_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x./xena_sncscan.stt:25:
first defined here
/usr/bin/ld:
cts_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x86_64/../cts_sncscan.stt:26:
multiple definition of `detector_paths';
xena_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x./xena_sncscan.stt:26:
first defined here

the versions of the two servers are absolutely equal (I copied the
version from one to another), however in one server I have this error...
What am i wrong?
Thank you in advance

Dariush

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