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How does CMake treat variable names? Are they case sensitive?
If I use FindFoo.cmake with
find_package(Foo)
can I use FOO_FOUND, Foo_FOUND and foo_FOUND?
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Local Variables You access a variable by using ${} , such as ${MY_VARIABLE} . 1. CMake has the concept of scope; you can access the value of the variable after you set it as long as you are in the same scope. If you leave a function or a file in a sub directory, the variable will no longer be defined.
CMake variables are case sensitive. See documentation.
As a side note, commands are case insensitive, and their arguments are case sensitive. See wiki. Keywords like STATUS are case sensitive because they are arguments. Example:
message(STATUS foo)
MESSAGE(status foo)
outputs:
foo
statusfoo
the second marked as a warning (default message type).
Still regarding case sensitivity, take also a look to the boolean variable section.
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They are case sensitive.
Here an example:
set(foo 42)
MESSAGE( STATUS ${foo})
MESSAGE( STATUS ${Foo})
Output:
-- 42
--
Look at the documentation of FindFoo to find out what the correct _FOUND variable is. Or maybe use this tool someday:
https://youtu.be/BPgXuvPAl-8?t=659
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