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768 B
25 lines
768 B
ENV
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---
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Operator to read environment variables.
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Use the syntax ``$ENV{VAR}`` to read environment variable ``VAR``.
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To test whether an environment variable is defined, use the signature
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``if(DEFINED ENV{<name>})`` of the :command:`if` command.
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.. note::
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Environment variable names containing special characters like parentheses
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may need to be escaped. (Policy :policy:`CMP0053` must also be enabled.)
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For example, to get the value of the Windows environment variable
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``ProgramFiles(x86)``, use:
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.. code-block:: cmake
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set(ProgramFiles_x86 "$ENV{ProgramFiles\(x86\)}")
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For general information on environment variables, see the
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:ref:`Environment Variables <CMake Language Environment Variables>`
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section in the :manual:`cmake-language(7)` manual.
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