Hello,
Regarding the cmake-commands manual [1], the "option" command seems to take as
argument a boolean constant that can have the two possible values: ON or OFF.
I would like to use three possible values for an option: AUTO (as default
value), ON or OFF.
Example:
option(ENABLE_SOMETHING "Enable SOMETHING support" AUTO)
But of course this example is wrong because "AUTO" is not ON or OFF.
Regarding the cmake-commands manual [2], the "if" command seems to return TRUE
when the boolean constant is 1, ON, YES, TRUE, Y, or a non-zero number.
It returns FALSE when the boolean constant is 0, OFF, NO, FALSE, N, IGNORE,
NOTFOUND, the empty string, or ends in the suffix -NOTFOUND.
I would like to check the value myself.
Example:
if(ENABLE_SOMETHING=AUTO)
message(STATUS "ENABLE_SOMETHING=AUTO")
endif()
if(ENABLE_SOMETHING=ON)
message(STATUS "ENABLE_SOMETHING=ON")
endif()
if(ENABLE_SOMETHING=OFF)
message(STATUS "ENABLE_SOMETHING=OFF")
endif()
But of course this example is wrong because "=" is not accepted for an
expression in a "if" command.
So my question is: How to handle options with more than two possible values?
Thank you.
Best regards.
[1] https://cmake.org/cmake/help/v3.7/command/option.html
[2] https://cmake.org/cmake/help/v3.7/command/if.html
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