Error while trying to setup NetworkTables on PC

[jreneew2]

Hello all, I have been trying to compile ntcore and cscore on a raspberry pi 3 and can not figure out the issue. Whenever I compile with

g++ -std=c++0x -I/home/pi/ntcore/include -lwpilibutil -lntcore test.cpp -o test `pkg-config --cflags --libs opencv`

The error I get is:

fatal error: llvm/ArrayRef.h: No such file or directory

I was able to successfully build the ntcore libs by doing

./gradlew :arm:build

All I have in the cpp file is #include<ntcore.h> and #include<networktables/NetworkTable.h>

Any help is appreciated

[Thad House]

Originally Posted by jreneew2

Hello all, I have been trying to compile ntcore and cscore on a raspberry pi 3 and can not figure out the issue. Whenever I compile with

g++ -std=c++0x -I/home/pi/ntcore/include -lwpilibutil -lntcore test.cpp -o test `pkg-config --cflags --libs opencv`

The error I get is:

fatal error: llvm/ArrayRef.h: No such file or directory

I was able to successfully build the ntcore libs by doing

./gradlew :arm:build

All I have in the cpp file is #include<ntcore.h> and #include<networktables/NetworkTable.h>

Any help is appreciated

You need to add the wpiutil include path "wpiutil/include" to your build command as well. Also you need to be linking with wpiutil, not wpilibutil.

One thing to note is that roborio builds built with ./gradlew :arm:ntcore:build will NOT work with a raspberry pi. They are completely separate architectures. We provide some (untested) artifacts for pi and other hf devices on our maven repo. Our recommendation for Pi is to download the 3 artifacts (cscore, wpiutil and ntcore) from our maven repo, and build locally on the Pi using those artifacts. You can find more information here regarding which artifacts to use and how to find the right ones for your specific device.

If you do want to build your own builds, download the repositories and run "./gradlew :arm:ntcore:build -PcompilerPrefix=" on the pi itself with nothing specified after the compiler prefix. That will trick the build system into building the arm artifacts with the built in compiler.

[jreneew2]

Originally Posted by Thad House

You need to add the wpiutil include path "wpiutil/include" to your build command as well. Also you need to be linking with wpiutil, not wpilibutil.

One thing to note is that roborio builds built with ./gradlew :arm:ntcore:build will NOT work with a raspberry pi. They are completely separate architectures. We provide some (untested) artifacts for pi and other hf devices on our maven repo. Our recommendation for Pi is to download the 3 artifacts (cscore, wpiutil and ntcore) from our maven repo, and build locally on the Pi using those artifacts. You can find more information here regarding which artifacts to use and how to find the right ones for your specific device.

If you do want to build your own builds, download the repositories and run "./gradlew :arm:ntcore:build -PcompilerPrefix=" on the pi itself with nothing specified after the compiler prefix. That will trick the build system into building the arm artifacts with the built in compiler.

Thanks! I figured it out with your help!