[CMake]: Replace CMAKE_SOURCE_DIR -> RPP_SOURCE_DIR

[zacharyvincze]

PR Description:

• Replaces CMAKE_SOURCE_DIR with RPP_SOURCE_DIR to properly refer to the relative source directory for RPP.

[zacharyvincze]

For future reference in this project. Please avoid using variables such as CMAKE_SOURCE_DIR or CMAKE_BINARY_DIR as this may break installs whenever RPP is being added to a larger project as a subdirectory.

Prefer to use the relative variants: CMAKE_CURRENT_SOURCE_DIR or CMAKE_CURRENT_BINARY_DIR instead. In the case of this, a variable is set in the root CMake: RPP_SOURCE_DIR to always refer to the root source directory of RPP, regardless of the location of any parent CMakeLists.txt files.

[Copilot]

Pull request overview

This pull request addresses a CMake configuration issue to properly support RPP being used as a subproject in other CMake projects. The changes replace CMAKE_SOURCE_DIR with RPP_SOURCE_DIR to ensure correct path resolution.

Changes:

• Replaced all instances of CMAKE_SOURCE_DIR with RPP_SOURCE_DIR in src/modules/CMakeLists.txt to ensure proper relative path resolution when RPP is used as a subproject

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #672   +/-   ##
========================================
  Coverage    92.69%   92.69%           
========================================
  Files          196      196           
  Lines        87559    87559           
========================================
+ Hits         81156    81158    +2     
+ Misses        6403     6401    -2     

see 1 file with indirect coverage changes

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