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Andre Kuhlenschmidt 4628cbd042 [flang][openacc] add optional extension to allow default none scalars (#197718 )

Adds the flag, `-facc-allow-default-none-scalars`. When this flag is
enabled, Flang reverts to the pre-3.2 behavior: scalar variables
referenced inside a `default(none)` compute region without an explicit
data clause do not produce an error. Instead, Flang infers implicit data
attributes for those scalars via the same implicit-copy logic applied in
regions without `default(none)`.

- Adds tests and documentation.
- Makes an explicit extensions doc for OpenACC to mirror the OpenMP
extensions doc.
- Moves the intentional deviations to from the standard to the
extensions doc.

2026-05-18 20:46:51 +00:00

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Welcome to Flang's documentation

Flang is LLVM's Fortran frontend that can be found here. It is often referred to as "LLVM Flang" to differentiate itself from "Classic 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 for tips on how to get in touch with us and to learn more about the current status.

.. toctree::
   :titlesonly:

   ReleaseNotes

Using Flang

.. toctree::
   :titlesonly:

   GettingStarted
   FlangCommandLineReference
   FortranStandardsSupport
   Extensions
   Directives
   OpenMPSupport
   OpenMP-extensions
   Real16MathSupport
   Unsigned
   FAQ

Contributing to Flang

.. toctree::
   :titlesonly:

   C++17
   C++style
   DesignGuideline
   FortranForCProgrammers
   GettingInvolved
   ImplementingASemanticCheck
   PullRequestChecklist

Design Documents

.. toctree::
   :titlesonly:

   Aliasing
   AliasingAnalysisFIR
   ArrayComposition
   ArrayRepacking
   AssumedRank
   BijectiveInternalNameUniquing
   Calls
   Character
   ComplexOperations
   ControlFlowGraph
   DebugGeneration
   DoConcurrent
   DoConcurrentConversionToOpenMP
   F202X
   FIRArrayOperations
   FIRLangRef
   FlangDriver
   FortranFeatureHistory
   FortranIR
   FortranLLVMTestSuite
   HighLevelFIR
   IORuntimeInternals
   InternalProcedureTrampolines
   Intrinsics
   IntrinsicTypes
   LabelResolution
   ModFiles
   OpenACC
   OpenACC-extensions
   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

Historical References

.. toctree::
   :titlesonly:

   HLFIRTransition

Indices and tables

* :ref:`genindex`
* :ref:`search`

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