509f181f40
When an ArrayRefParameter (or OptionalArrayRefParameter) appears in a non-last position within a struct() assembly format directive, the printed output is ambiguous: the comma-separated array elements are indistinguishable from the struct-level commas separating key-value pairs. Fix this by wrapping such parameters in square brackets in both the generated printer and parser. The printer emits '[' before and ']' after the array value; the parser calls parseLSquare()/parseRSquare() around the FieldParser call. Parameters with a custom printer or parser are unaffected (the user controls the format in that case). Fixes #156623 Assisted-by: Claude Code
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.