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Building, Debugging, and Testing on Unix.md

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Building, Debugging and Testing on Unix

This guide is meant to help developers setup an environment for debugging / contributing to Roslyn from Linux. Particularly for developers who aren't experienced with .NET Core development on Linux.

Working with the code

  1. Ensure the commands git and curl are available
  2. Clone git@github.com:dotnet/roslyn.git
  3. Run ./build.sh --restore
  4. Run ./build.sh --build

Working in Visual Studio Code

  1. Install VS Code
    • After you install VS Code, install the C# extension
    • Important tip: You can look up editor commands by name by hitting Ctrl+Shift+P, or by hitting Ctrl+P and typing a > character. This will help you get familiar with editor commands mentioned below. On a Mac, use ⌘ instead of Ctrl.
  2. Install the .NET 9.0 SDK which matches the sdk.version property in global.json
  3. You can build from VS Code by running the Run Build Task command, then selecting an appropriate task such as build or build current project (the latter builds the containing project for the current file you're viewing in the editor).
  4. You can run tests from VS Code by opening a test class in the editor, then using the Run Tests in Context and Debug Tests in Context editor commands. You may want to bind these commands to keyboard shortcuts that match their Visual Studio equivalents (Ctrl+R, T for Run Tests in Context and Ctrl+R, Ctrl+T for Debug Tests in Context).
  5. You can launch a new VS Code instance with the language server from your current code by running the "launch vscode with language server" task.

Running Tests

The unit tests can be executed by running ./build.sh --test.

To run all tests in a single project, it's recommended to use the dotnet test path/to/project command.

GitHub

The best way to clone and push is to use SSH. On Windows you typically use HTTPS and this is not directly compatible with two factor authentication (requires a PAT). The SSH setup is much simpler and GitHub has a great HOWTO for getting this setup.

https://help.github.com/articles/connecting-to-github-with-ssh/

Debugging test failures

The best way to debug is using lldb with the SOS plugin. This is the same SOS as used in WinDbg and if you're familiar with it then lldb debugging will be pretty straight forward.

The dotnet/diagnostics repo has more information:

CoreCLR also has some guidelines for specific Linux debugging scenarios:

Corrections:

  • LLDB and createdump must be run as root
  • dotnet tool install -g dotnet-symbol must be run from $HOME

Core Dumps

The CoreClr does not used the standard core dumping mechanisms on Linux. Instead you must specify via environment variables that you want a core dump to be produced. The simplest setup is to do the following:

> export COMPlus_DbgEnableMiniDump=1
> export COMPlus_DbgMiniDumpType=4

This will cause full memory dumps to be produced which can then be loaded into LLDB.

A preview of dotnet-dump is also available for interactively creating and analyzing dumps.

GC stress failures

When you suspect there is a GC failure related to your test then you can use the following environment variables to help track it down.

> export COMPlus_HeapVerify=1
> export COMPlus_gcConcurrent=1

The COMPlus_HeapVerify variable causes GC to run a verification routine on every entry and exit. Will crash with a more actionable trace for the GC team.

The COMPlus_gcConcurrent variable removes concurrency in the GC. This helps isolate whether this is a GC failure or memory corruption outside the GC. This should be set after you use COMPLUS_HeapVerify to determine it is indeed crashing in the GC.

Note: this variables can also be used on Windows as well.

Ubuntu 18.04

The recommended OS for developing Roslyn is Ubuntu 18.04. This guide was written using Ubuntu 18.04 but should be applicable to most Linux environments. Ubuntu 18.04 was chosen here due to it's support for enhanced VMs in Hyper-V. This makes it easier to use from a Windows machine: full screen, copy / paste, etc ...

Hyper-V

Hyper-V has a built-in Ubuntu 18.04 image which supports enhanced mode. For more information, see a tutorial for creating such an image.

When following this make sure to:

  1. Click Installation Source and uncheck "Windows Secure Boot"
  2. Complete the Ubuntu installation wizard. Full screen mode won't be available until this is done.

Overall this takes about 5-10 minutes to complete.

Source Link

Many of the repositories that need to be built use source link and it crashes on Ubuntu 18.04 due to dependency changes. To disable source link add the following to the Directory.Build.props file in the root of the repository.

<EnableSourceControlManagerQueries>false</EnableSourceControlManagerQueries>
<EnableSourceLink>false</EnableSourceLink>
<DeterministicSourcePaths>false</DeterministicSourcePaths>

Prerequisites

Make sure to install the following via apt install

  • clang
  • lldb
  • cmake
  • xrdp