commit | 0870180a40a5f2d6815c29727742b4b523e62423 | [log] [tgz] |
---|---|---|
author | Peter Klausler <35819229+klausler@users.noreply.github.com> | Mon Apr 08 11:57:01 2024 -0700 |
committer | Copybara-Service <copybara-worker@google.com> | Mon Apr 08 12:01:00 2024 -0700 |
tree | 520c13d2f5962df1de1cb700dbf764ffaa179719 | |
parent | d7b72daef4ec5dcfb9826f22800f48a098353173 [diff] |
[flang] Clean up ISO_FORTRAN_ENV, fix NUMERIC_STORAGE_SIZE (#87566) Address TODOs in the intrinsic module ISO_FORTRAN_ENV, and extend the implementation of NUMERIC_STORAGE_SIZE so that the calculation of its value is deferred until it is needed so that the effects of -fdefault-integer-8 or -fdefault-real-8 are reflected. Emit a warning when NUMERIC_STORAGE_SIZE is used from the module file and the default integer and real sizes do not match. Fixes https://github.com/llvm/llvm-project/issues/87476. GitOrigin-RevId: e1ad2735c3e7b0af94159f585458c7383255f03e
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.