9478f661c2
This is a big refactor of the clang driver's option handling to use the Visibility flags introduced in https://reviews.llvm.org/D157149. There are a few distinct parts, but they can't really be split into separate commits and still be made to compile. 1. We split out some of the flags in ClangFlags to ClangVisibility. Note that this does not include any subtractive flags. 2. We update the Flag definitions and OptIn/OptOut constructs in Options.td by hand. 3. We introduce and use a script, update_options_td_flags, to ease migration of flag definitions in Options.td, and we run that on Options.td. I intend to remove this later, but I'm committing it so that downstream forks can use the script to simplify merging. 4. We update calls to OptTable in the clang driver, cc1as, flang, and clangd to use the visibility APIs instead of Include/Exclude flags. 5. We deprecate the Include/Exclude APIs and add a release note. *if you are running into conflicts with this change:* Note that https://reviews.llvm.org/D157150 may also be the culprit and if so it should be handled first. The script in `clang/utils/update_options_td_flags.py` can help. Take the downstream side of all conflicts and then run the following: ``` % cd clang/include/clang/Driver % ../../../utils/update_options_td_flags.py Options.td > Options.td.new % mv Options.td.new Options.td ``` This will hopefully be sufficient, please take a look at the diff. Differential Revision: https://reviews.llvm.org/D157151 |
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| include | ||
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| module | ||
| runtime | ||
| test | ||
| tools | ||
| unittests | ||
| .clang-format | ||
| .clang-tidy | ||
| .drone.star | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| LICENSE.TXT | ||
| README.md | ||
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.