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Help: Document if(DEFINED ENV{name})

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Joachim Wuttke (h) 2018-11-01 22:26:32 +01:00
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Help/command/if.rst
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@ -187,10 +187,11 @@ Possible conditions are:
``if(<variable|string> IN_LIST <variable>)``
True if the given element is contained in the named list variable.
``if(DEFINED <variable>)``
True if the given variable is defined. It does not matter if the
variable is true or false just if it has been set. (Note macro
arguments are not variables.)
``if(DEFINED <name>|ENV{<name>})``
True if a variable or environment variable
with given ``<name>`` is defined.
The value of the variable does not matter.
Note that macro arguments are not variables.
``if((condition) AND (condition OR (condition)))``
The conditions inside the parenthesis are evaluated first and then
@ -270,6 +271,7 @@ A quoted or bracketed variable or keyword will be interpreted as a
string and not dereferenced or interpreted.
See policy :policy:`CMP0054`.
There is no short form for environment or cache :ref:`Variable References`.
They can be referenced as ``$ENV{<name>}`` or ``$CACHE{<name>}``
wherever the above-documented condition syntax accepts <variable|string>.
There is no automatic evaluation for environment or cache
:ref:`Variable References`. Their values must be referenced as
``$ENV{<name>}`` or ``$CACHE{<name>}`` wherever the above-documented
condition syntax accepts ``<variable|string>``.