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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 [Getting Involved](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
   DesignGuideline
   FortranForCProgrammers
   FortranStandardsSupport
   GettingInvolved
   GettingStarted
   ImplementingASemanticCheck
   OpenMPSupport
   PullRequestChecklist
```

# Design Documents

```{eval-rst}
.. toctree::
   :titlesonly:

   Aliasing
   AliasingAnalysisFIR
   ArrayComposition
   ArrayRepacking
   AssumedRank
   BijectiveInternalNameUniquing
   Calls
   Character
   ComplexOperations
   ControlFlowGraph
   DebugGeneration
   Directives
   DoConcurrent
   DoConcurrentConversionToOpenMP
   Extensions
   F202X
   FIRArrayOperations
   FIRLangRef
   FlangCommandLineReference
   FlangDriver
   FortranFeatureHistory
   FortranIR
   FortranLLVMTestSuite
   HighLevelFIR
   IORuntimeInternals
   InternalProcedureTrampolines
   Intrinsics
   IntrinsicTypes
   LabelResolution
   ModFiles
   OpenACC
   OpenACC-descriptor-management.md
   OpenMP-4.5-grammar.md
   OpenMP-declare-target
   OpenMP-descriptor-management
   OpenMP-semantics
   OptionComparison
   Overview
   ParallelMultiImageFortranRuntime
   ParameterizedDerivedTypes
   ParserCombinators
   Parsing
   PolymorphicEntities
   Preprocessing
   ProcedurePointer
   RuntimeDescriptor
   RuntimeEnvironment
   RuntimeTypeInfo
   Semantics
   f2018-grammar.md
   fstack-arrays
   Real16MathSupport
   Unsigned
```

# Indices and tables

```{eval-rst}
* :ref:`genindex`
* :ref:`search`
```