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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
constant. False otherwise, including if the variable is undefined.
Note that macro arguments are not variables.
Environment variables also cannot be tested this way, e.g.
``if(ENV{some_var})`` will always evaluate to false.
:ref:`Environment Variables <CMake Language Environment Variables>` also
cannot be tested this way, e.g. ``if(ENV{some_var})`` will always evaluate
to false.
``if(<string>)``
A quoted string always evaluates to false unless: