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c2efb3efcd
Revise docs for all "Scripting Commands", except four find_XXX that use a macro suite of their own. * Take full advantage of the improved syntax highlighting. * Make consequential use of <..> placeholders. * Clarify things here and there in the text. Specific improvements to some command docs: * "math": Correct description of novel hexadecimal capability. * "if", "foreach", "while": Provide link to "endif" etc * "foreach", "while": Mention "break" and "continue". * "foreach": Simplify explanation of ``RANGE`` and ``IN`` signatures; advise against negative arguments or reverse ranges (compare issue #18461) * "endif", "endfunction" etc: Explain that the argument is optional and maintained for compatibility only
17 lines
495 B
ReStructuredText
17 lines
495 B
ReStructuredText
option
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------
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Provide an option that the user can optionally select.
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.. code-block:: cmake
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option(<variable> "<help_text>" [value])
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Provides an option for the user to select as ``ON`` or ``OFF``.
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If no initial ``<value>`` is provided, ``OFF`` is used.
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If ``<variable>`` is already set as a normal variable
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then the command does nothing (see policy :policy:`CMP0077`).
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If you have options that depend on the values of other options, see
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the module help for :module:`CMakeDependentOption`.
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