[flang][cuda] Skip device-only specifics at host call sites in generic resolution (#234710) When CUDA is enabled and the call site is not in a device context, skip specifics whose only CUDA subprogram attribute is DEVICE. HOST,DEVICE and unattributed specifics are unaffected. Call sites inside CUF kernel and OpenACC regions, which share Scope::Kind::OpenACCConstruct and may be device code in a host subprogram, are left unfiltered. GitOrigin-RevId: 72015f2d65274c8586ff420aa9158050058f1584
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.