Welcome back! It's 8th week and the Fortran Package Manager (FPM) now compiles fully till the ASR (Abstract Semantic Representation) stage using LFortran! The focus was primarily on creating and fixing MREs related to fpm and tomlf compilation, uncovering deeper issues in AST-to-ASR and some ASR-to-LLVM logic.

Many errors encountered were due tocomplex complex language features like runtime polymorphism, type-bound procedures, select type resolution, and interface dispatching. These are now isolated, with some fixed and others with MREs which I will be fixing later.

Work done this week:

• FPM compiled fully till ASR stage:
  • All core modules and dependencies now emit correct ASR without fatal errors and 5-6 workarounds for which we have MREs.
  • Started identifying and resolving ASR to LLVM issues.
• Key MREs created:
  • Issue #7974: Handle type containing procedure in select type inside another type bound procedure
  • Issue #7984: Handle association of m_assoc_name variable to structInstanceMember in select type statements
  • Issue #8009: Handle deffered operator overloading used in a type bound procedure
• Sample Fixes / Pull Requests:
  • PR #7978: Maintain current selector var properly and use it to get current derived type
  • PR #7975: Get struct vtab correctly if not present in scope
  • PR #8001: Check current selector name for deciding is_polymorphic in visit_Arrayitem

This week involved around 18 hours of focused debugging and implementation. Next focus will be to get fpm soon till LLVM.

Huge thanks to Ondřej Čertík and Pranav Goswami for continued feedback and reviews.

Plan for next week:

• Resolve blocking ASR to LLVM issues and generate full IR for FPM.
• Submit remaining patches for polymorphism improvements.
• Ensure FPM builds reproducibly on LFortran via CI pipeline by end of next week.