Support For frc2019-toolchain

[jath03]

I'm using the beta ppa for the 2019 toolchain on ubuntu 18.04. When I try to build the example cpp project, it doesn't find any valid toolchain. It only looks for arm-frc-linux-gnueabi-g++, but it needs to recognize arm-frc2019-linux-gnueabi-g++ as a valid toolchain. Is the toolchain not supported, or just not found? This is the output of the build with the --info flag.

~/Downloads/GradleRIO/examples/cpp$ ./gradlew build --info
Initialized native services in: /home/jack/.gradle/native
The client will now receive all logging from the daemon (pid: 2722). The daemon log file: 
/home/jack/.gradle/daemon/4.7/daemon-2722.out.log
Starting 2nd build in daemon [uptime: 7.045 secs, performance: 98%]
Using 1 worker leases.
Starting Build
Settings evaluated using settings file 
'/home/jack/Downloads/GradleRIO/examples/cpp/settings.gradle'.
Projects loaded. Root project using build file 
'/home/jack/Downloads/GradleRIO/examples/cpp/build.gradle'.
Included projects: [root project 'cpp']

> Configure project :
Evaluating root project 'cpp' using build file 
'/home/jack/Downloads/GradleRIO/examples/cpp/build.gradle'.
Destination file already exists. Skipping 'JreZulu_18u131_kickoff.ipk'
All projects evaluated.
Starting process 'command 'which''. Working directory: 
/home/jack/Downloads/GradleRIO/examples/cpp Command: which arm-frc-linux-gnueabi-g++
Successfully started process 'command 'which''
FRC Home:
  - Valid?: false
  - Found?: false
  - Version Range:
      - Low: 5.5
      - High: 5.5
      - Is Valid?: false
  - Root: null
  - Bin: null
  - Lib: null
  - Include: null
  - Gcc: null
  - Gdb: null
GradleRIO Home:
  - Valid?: false
 - Found?: false
   - Version Range:
      - Low: 5.5
      - High: 5.5
      - Is Valid?: false
  - Root: null
  - Bin: null
  - Lib: null
  - Include: null
  - Gcc: null
  - Gdb: null

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'cpp'.
> Exception thrown while executing model rule: 
NativeComponentModelPlugin.Rules#createDefaultToolChain(NativeToolChainRegistryInternal)
   > Could not create an instance of type edu.wpi.first.gradlerio.wpi.toolchain.WPIRoboRioGcc_Decorated.
      > No valid toolchain(s) found! Information dumped to info log (run with --info)

* Try:
Run with --stacktrace option to get the stack trace. Run with --debug option to get more log output. 
Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 8s

[PeterJohnson]

We haven't updated GradleRIO for 2019 yet.

[jath03]

Could I just rename the 2019 toolchain files?

[PeterJohnson]

What are you trying to do? The 2019 toolchain cannot be used to compile programs for a 2018 roboRio. If you want to compile programs for 2018, use the 2018 toolchain.

[jath03]

Oh, the 2018 version wasn't installing correctly - annoying dependency stuff that I never figured out - so I just used used the 2019 version and thought that there wouldn't be much of a difference. Nevermind then.

[JaciBrunning]

I'm gonna keep this open just so it's on the roadmap