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Help: from command:if, link to environment variables

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Joachim Wuttke (h)
2022-05-04 15:13:53 +02:00
committed by Brad King
parent ab2bdbaf31
commit a693da21f3
1 changed files with 3 additions and 2 deletions
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5
Help/command/if.rst
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@@ -71,8 +71,9 @@ Basic Expressions
True if given a variable that is defined to a value that is not a false True if given a variable that is defined to a value that is not a false
constant. False otherwise, including if the variable is undefined. constant. False otherwise, including if the variable is undefined.
Note that macro arguments are not variables. Note that macro arguments are not variables.
Environment variables also cannot be tested this way, e.g. :ref:`Environment Variables <CMake Language Environment Variables>` also
``if(ENV{some_var})`` will always evaluate to false. cannot be tested this way, e.g. ``if(ENV{some_var})`` will always evaluate
to false.
``if(<string>)`` ``if(<string>)``
A quoted string always evaluates to false unless: A quoted string always evaluates to false unless: