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Help: Clarify INCLUDE_DIRECTORIES directory property behavior

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Ordering w.r.t. target creation is important for this property.

Fixes: #17754
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Brian Heim 2018-09-02 00:20:57 -05:00 committed by Brad King
parent 7b9d8ce168
commit 6d8cabe8d4
1 changed files with 9 additions and 3 deletions
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12
Help/prop_dir/INCLUDE_DIRECTORIES.rst
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@ -11,11 +11,17 @@ target property, which is used by the generators to set the include
directories for the compiler.
In addition to accepting values from that command, values may be set
directly on any directory using the :command:`set_property` command. A
directory gets its initial value from its parent directory if it has one.
The initial value of the :prop_tgt:`INCLUDE_DIRECTORIES` target property
directly on any directory using the :command:`set_property` command, and can be
set on the current directory using the :command:`set_directory_properties`
command. A directory gets its initial value from its parent directory if it has
one. The initial value of the :prop_tgt:`INCLUDE_DIRECTORIES` target property
comes from the value of this property. Both directory and target property
values are adjusted by calls to the :command:`include_directories` command.
Calls to :command:`set_property` or :command:`set_directory_properties`,
however, will update the directory property value without updating target
property values. Therefore direct property updates must be made before
calls to :command:`add_executable` or :command:`add_library` for targets
they are meant to affect.
The target property values are used by the generators to set the
include paths for the compiler.