Protection against missing LITTLEFS_PATH

[frobijn]

Description

Compilation fails with a clear error message if LITTLEFS_PATH is not assigned

Motivation and Context

If the variable is not set, the error message ("cannot find file...") is not very clear and does not point to the root problem.

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dev Containers (changes related with Dev Containers, has no impact on code or features)
• Dependencies/declarations (update dependencies or assembly declarations and changes associated, has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).

Summary by CodeRabbit

• New Features
  • Introduced a verification step that checks for the LITTLEFS_PATH environment variable before the build process, enhancing error handling and preventing build failures.
  • Users will receive clear instructions if the LITTLEFS_PATH is not set, guiding them to configure their environment correctly.

[coderabbitai]

Walkthrough

The changes introduce a new build target named LITTLEFS_PATH_verification in two project files: littlefs.vcxproj and nanoFramework.nanoCLR.vcxproj. This target is designed to check if the LITTLEFS_PATH environment variable is set. If it is not set, the target triggers an error message prompting users to define the variable, ensuring that the necessary environment configuration is in place before the build process begins.

Changes

File	Change Summary
targets/netcore/littlefs/littlefs.vcxproj	Added a target LITTLEFS_PATH_verification to check if LITTLEFS_PATH is set; triggers an error if not.
targets/netcore/nanoFramework.nanoCLR/nanoFramework.nanoCLR.vcxproj	Added a target LITTLEFS_PATH_verification to check if LITTLEFS_PATH is set; triggers an error if not.

Possibly related PRs

• Improvements in littlefs for virtual device #2986: This PR introduces a new target named LITTLEFS_PATH_verification in the hal_littlefs.c file, which is directly related to the changes made in the main PR that also adds the same target in the littlefs.vcxproj file.

Suggested labels

Type: enhancement

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[josesimoes]

LGTM!

[nfbot]

@frobijn thank you again for your contribution! 🙏😄

.NET nanoFramework is all about community involvement, and no contribution is too small.
We would like to invite you to join the project's Contributors list.

Please edit it and add an entry with your GitHub username in the appropriate location (names are sorted alphabetically):

  <tr>
    <td><img src="https://github.com/frobijn.png?size=50" height="50" width="50" ></td>
    <td><a href="https://github.com/frobijn">Frank Robijn</a></td>
  </tr>

(Feel free to adjust your name if it's not correct)