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project: Define variables indicating whether project is top level

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Define `PROJECT_IS_TOP_LEVEL` and `<PROJECT-NAME>_IS_TOP_LEVEL`.  The
latter is a STATIC cache entry just like other `<PROJECT-NAME>_*`
variables so that it is globally scoped.

Issue: #20310
Fixes: #21961
This commit is contained in:
friendlyanon
2021-03-24 19:59:14 +00:00
committed by Brad King
parent 3706e9c97c
commit 96a7040107
14 changed files with 100 additions and 0 deletions
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Help/command/project.rst
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@@ -28,6 +28,11 @@ Also sets the variables:
:variable:`PROJECT_BINARY_DIR`, :variable:`<PROJECT-NAME>_BINARY_DIR`
Absolute path to the binary directory for the project.
:variable:`PROJECT_IS_TOP_LEVEL`, :variable:`<PROJECT-NAME>_IS_TOP_LEVEL`
.. versionadded:: 3.21
Boolean value indicating whether the project is top-level.
Further variables are set by the optional arguments described in the following.
If any of these arguments is not used, then the corresponding variables are
set to the empty string.