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# Welcome to Flang's documentation
Flang is LLVM's Fortran frontend that can be found
[here](https://github.com/llvm/llvm-project/tree/main/flang). It is often
referred to as "LLVM Flang" to differentiate itself from ["Classic
Flang"](https://github.com/flang-compiler/flang) - these are two separate and
independent Fortran compilers. LLVM Flang is under active development. While it
is capable of generating executables for a number of examples, some
functionality is still missing. See [GettingInvolved](GettingInvolved) for tips
on how to get in touch with us and to learn more about the current status.
```eval_rst
.. toctree::
:titlesonly:
ReleaseNotes
```
# Contributing to Flang
```eval_rst
.. toctree::
:titlesonly:
C++17
C++style
FortranForCProgrammers
GettingInvolved
GettingStarted
ImplementingASemanticCheck
PullRequestChecklist
```
# Design Documents
```eval_rst
.. toctree::
:titlesonly:
ArrayComposition
BijectiveInternalNameUniquing
Calls
Character
ControlFlowGraph
Directives
DoConcurrent
Extensions
FIRLangRef
FlangCommandLineReference
FlangDriver
FortranIR
FortranLLVMTestSuite
IORuntimeInternals
Intrinsics
IntrinsicTypes
LabelResolution
ModFiles
OpenMP-4.5-grammar.md
OpenMP-semantics
OptionComparison
Overview
ParserCombinators
Parsing
Preprocessing
RuntimeDescriptor
RuntimeTypeInfo
Semantics
f2018-grammar.md
```
# Indices and tables
```eval_rst
* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`
```
|
