TheRock/compiler/amd-llvm/flang/docs/ReleaseNotes.md

Flang {{version}} {{in_progress}}Release Notes

```{warning}
These are in-progress notes for the upcoming LLVM {{version}} release.
Release notes for previous releases can be found on [the Download
Page](https://releases.llvm.org/download.html).
```

Introduction

This document contains the release notes for the Flang Fortran frontend, part of the LLVM Compiler Infrastructure, release {{version}}. Here we describe the status of Flang in some detail, including major improvements from the previous release and new feature work. For the general LLVM release notes, see the LLVM documentation. All LLVM releases may be downloaded from the LLVM releases web site.

Note that if you are reading this file from a Git checkout, this document applies to the next release, not the current one. To see the release notes for a specific release, please see the releases page.

Major New Features

Bug Fixes

Non-comprehensive list of changes in this release

New Compiler Flags

• The warning flags with prefixes -Wopen-mp and -Wopen-acc have been deprecated in favor of corrected spellings with the respective prefixes -Wopenmp and -Wopenacc. Removal of the deprecated options is planned for LLVM 25 (July 2027).
• The -Werror flag will cause all warnings to become errors. This includes warnings about support for OpenMP versions, which will now prevent the compilation from happening with the -Werror flag. These OpenMP warnings can be disabled with -Wno-experimental-option.

Windows Support

Fortran Language Changes in Flang

Build System Changes

New Issues Found

Additional Information

Flang's documentation is located in the flang/docs/ directory in the LLVM monorepo.

If you have any questions or comments about Flang, please feel free to contact us on the Discourse forums.