33 lines
1.3 KiB
Markdown
33 lines
1.3 KiB
Markdown
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<!--===- docs/Directives.md
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Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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See https://llvm.org/LICENSE.txt for license information.
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SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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-->
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# Compiler directives supported by Flang
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A list of non-standard directives supported by Flang
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* `!dir$ fixed` and `!dir$ free` select Fortran source forms. Their effect
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persists to the end of the current source file.
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* `!dir$ ignore_tkr [[(TKRDMAC)] dummy-arg-name]...` in an interface definition
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disables some semantic checks at call sites for the actual arguments that
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correspond to some named dummy arguments (or all of them, by default).
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The directive allow actual arguments that would otherwise be diagnosed
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as incompatible in type (T), kind (K), rank (R), CUDA device (D), or
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managed (M) status. The letter (A) is a shorthand for all of these,
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and is the default when no letters appear. The letter (C) checks for
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contiguity for example allowing an element of an assumed-shape array to be
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passed as a dummy argument. For example, if one wanted to call a "set all
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bytes to zero" utility that could be applied to arrays of any type or rank:
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```
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interface
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subroutine clear(arr,bytes)
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!dir$ ignore_tkr arr
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integer(1), intent(out) :: arr(bytes)
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end
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end interface
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```
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