32-Bit LabVIEW RT 2019 finds a 64-Bit .so on NI Linux RT, but doesn't find the 32-Bit .so

[blackburnite]

I have a .so library, both a 64/32 bit version.  These are located at /usr/lib on a PXI running 64-bit NI Linux RT.

When calling a function from this library, the deployment fails, if the call library function node is configured to use the 32-bit library, with error that it was unable to find the library.  It does not fail with the 64-bit version.

This does not make sense to me since LabVIEW RT is 32-bit.

[rolfk]

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@blackburnite wrote:

This does not make sense to me since LabVIEW RT is 32-bit.

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Only if your RT target uses an ARM CPU. If it is an Intel CPU it absolutely certainly is a 64 bit executable (but you don't notice it from your Windows system as LabVIEW transparently cross compiles it for the 64 bit Linux target).

[blackburnite]

This is what I thought was happening based on the behavior but I couldn't find any documentation going into detail on the RT engine for NI Linux as far as bitness and/or how compilation occurs from 32bit-LabVIEW.