[flang] Fix homonymous interface and procedure warning (#171696) When emitting an homonymous generic interface and procedure warning, the source locations of the interface and the procedure were being compared to find the one that occurred later in the source file. The problem is that they could be in different source/module files, which makes the comparison invalid. Fix it by using parser::AllCookedSources::Precedes() instead, that correctly handle names in different source files. GitOrigin-RevId: 6395afa535e9a05bc97ca7876fac1024de8ee17d
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.
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.