ed37bdcc3e
Refactor how `func.func` discardable attributes are handled in the Func-to-LLVM conversion. Instead of ad hoc checks for linkage and readnone followed by a simple filter, the pass now generically processes inherent attributes from LLVMFuncOp. Attributes that correspond to inherent `llvm.func` ODS names can be attached as `llvm.<name>` on `func.func` and are stripped to `<name>` when building `LLVM::LLVMFuncOp`, so LLVM-specific knobs stay namespaced on the source op but land on the right inherent slots on `llvm.func`. Other discardable attributes continue to be propagated as-is. Fixes #175959 Fixes #181464 Assisted-by: CLion code completion, GPT 5.3-Codex --------- Co-authored-by: Mehdi Amini <joker.eph@gmail.com>
Flang
Flang is a ground-up implementation of a Fortran front end written in modern C++. It started off as the f18 project (https://github.com/flang-compiler/f18) with an aim to replace the previous flang project (https://github.com/flang-compiler/flang) and address its various deficiencies. F18 was subsequently accepted into the LLVM project and rechristened as Flang.
Please note that flang is not ready yet for production usage.
Getting Started
Read more about flang in the docs directory. Start with the compiler overview.
To better understand Fortran as a language and the specific grammar accepted by flang, read Fortran For C Programmers and flang's specifications of the Fortran grammar and the OpenMP grammar.
Treatment of language extensions is covered in this document.
To understand the compilers handling of intrinsics, see the discussion of intrinsics.
To understand how a flang program communicates with libraries at runtime, see the discussion of runtime descriptors.
If you're interested in contributing to the compiler, read the style guide and also review how flang uses modern C++ features.
If you are interested in writing new documentation, follow LLVM's Markdown style guide.
Consult the Getting Started with Flang for information on building and running flang.