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Help: Fix CMAKE_HOST_SYSTEM_PROCESSOR use of uname

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Currently the document says that `CMAKE_HOST_SYSTEM_PROCESSOR` is the
output of `uname -p` if a system supports `uname`.  Update the
documented behavior to match `CMakeDetermineSystem.cmake` code.

Fixes: #20004
This commit is contained in:
Hong Xu
2019-12-02 10:50:31 -08:00
committed by Brad King
parent 735d731119
commit e622832211
1 changed files with 10 additions and 3 deletions
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Help/variable/CMAKE_HOST_SYSTEM_PROCESSOR.rst
+10 -3
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@@ -3,6 +3,13 @@ CMAKE_HOST_SYSTEM_PROCESSOR
The name of the CPU CMake is running on.
On systems that support ``uname``, this variable is set to the output of
``uname -p``. On Windows it is set to the value of the environment variable
``PROCESSOR_ARCHITECTURE``.
On Windows, this variable is set to the value of the environment variable
``PROCESSOR_ARCHITECTURE``. On systems that support ``uname``, this variable is
set to the output of:
- ``uname -m`` on GNU, Linux, Cygwin, Darwin, Android, or
- ``arch`` on OpenBSD, or
- on other systems,
* ``uname -p`` if its exit code is nonzero, or
* ``uname -m`` otherwise.