stack:tldr:fbdea

The "stack build" command is used in Haskell programming with the Stack tool to build a Haskell project.

When you run the "stack build" command, it instructs Stack to compile the Haskell source code in your project and build the executable and/or library defined in your project configuration. It also downloads and installs any necessary dependencies specified in your project's dependency file, typically the "stack.yaml" file.

Here's the general process executed by the "stack build" command:

1. Stack first checks if your project's dependencies are already installed. If they are not found or if you have made changes to your dependency configuration, Stack will download and install the necessary dependencies from package repositories like Hackage or Stackage.

2. Once the dependencies are resolved and installed, Stack compiles your project's Haskell source code. It uses the GHC compiler and takes care of any GHC options or build flags specified in your project configuration files.

3. If the compilation is successful, Stack generates the executable and/or library defined in your project configuration. The generated artifacts are usually created in a "dist" directory within your project.

The "stack build" command is often used during the development phase to check for building errors and ensure that the project is set up correctly. If the command completes successfully, you can then execute the resulting binary using the "stack exec" command or run any project-specific test suites or benchmarks.