mirror of https://github.com/llvm/llvm-project.git synced 2025-04-24 15:56:09 +00:00

[Flang] LLVM_ENABLE_RUNTIMES=flang-rt (#110217 )

Extract Flang's runtime library to use the LLVM_ENABLE_RUNTIME
mechanism. It will only become active when
`LLVM_ENABLE_RUNTIMES=flang-rt` is used, which also changes the
`FLANG_INCLUDE_RUNTIME` to `OFF` so the old runtime build rules do not
conflict. This also means that unless `LLVM_ENABLE_RUNTIMES=flang-rt` is
passed, nothing changes with the current build process.

Motivation:
* Consistency with LLVM's other runtime libraries (compiler-rt, libc,
libcxx, openmp offload, ...)
* Allows compiling the runtime for multiple targets at once using the
LLVM_RUNTIME_TARGETS configuration options
* Installs the runtime into the compiler's per-target resource directory
so it can be automatically found even when cross-compiling

Also see RFC discussion at
https://discourse.llvm.org/t/rfc-use-llvm-enable-runtimes-for-flangs-runtime/80826

2025-02-16 15:39:52 +01:00

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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.

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

Windows Support

Fortran Language Changes in Flang

Build System Changes

The FortranRuntime library has been renamed to flang_rt.runtime.
The FortranFloat128Math library has been renamed to flang_rt.quadmath.
The CufRuntime_cuda_${version} library has been renamed to flang_rt.cuda_${version}.
The Fortran Runtime library has been move to a new top-level directory named "flang-rt". It now supports the LLVM_ENABLE_RUNTIMES mechanism to build Flang-RT for multiple target triples. libflang_rt.runtime.{a|so} will now be emitted into Clang's per-target resource directory (next to libclang_rt..) where it is also found by Flang's driver.

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.

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