79f3653fbd
Re-apply "[flang][cmake] Fix bcc dependencies (#125822)" It was overwritten due to an automatic merge gone wrong for #124416. `git cherry-pick f9af5c145f40480d46874b643ca2b1237e9fbb2a` applied in 97cf061e83a0d0cada38d8a2d75c8a840b01ba26 ignored the renaming of FortranCommon into FortranSupport after #125822. Original commit message: The Fortran libraries are not part of MLIR, so they should use target_link_libraries() rather than mlir_target_link_libraries(). This fixes an issue introduced in #20966. (cherry picked from commit 2bb23d444767540c59c32ccdb86f7ef6e35fd96e)
Flang
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.
Getting Started
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.