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Help: Document target_precompile_headers genex with angle brackets

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When passing a `<header>` inside a generator expression, the closing
`>` needs to be encoded as `$<ANGLE-R>`.  Add an example to the docs.

Fixes: #19940
This commit is contained in:
Brad King 2019-11-08 09:14:31 -05:00
parent c1d5d5eb11
commit f35df783b5
1 changed files with 11 additions and 0 deletions
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Help/command/target_precompile_headers.rst
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@ -79,6 +79,17 @@ must be available for the compiler to find them. Other header file names
source directory (e.g. :variable:`CMAKE_CURRENT_SOURCE_DIR`) and will be
included by absolute path.
When specifying angle brackets inside a :manual:`generator expression
<cmake-generator-expressions(7)>`, be sure to encode the closing ``>``
as ``$<ANGLE-R>``. For example:
.. code-block:: cmake
target_precompile_headers(mylib PRIVATE
"$<$<COMPILE_LANGUAGE:C>:<stddef.h$<ANGLE-R>>"
"$<$<COMPILE_LANGUAGE:CXX>:<cstddef$<ANGLE-R>>"
)
See Also
^^^^^^^^