[CMake] How to handle options with more than two possible values?
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 -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
Re: [CMake] How to handle options with more than two possible values?
Hi. option() is a handy shortcut for boolean options, but it's little more than syntactic sugar for a cache variable of type BOOL. To create a tristate variable, you can do this: set(ENABLE_SOMETHING AUTO CACHE STRING "Enable SOMETHING support") # create the variable set_property(CACHE ENABLE_SOMETHING PROPERTY STRINGS AUTO ON OFF) # define list of values GUI will offer for the variable Then, you can test the variable like this: if(ENABLE_SOMETHING STREQUAL "AUTO") # AUTO was used elseif(ENABLE_SOMETHING) # a true value (such as ON) was used else() # a false value (such as OFF) was used endif() Hope this helps. Petr On 13 October 2016 at 13:32, YuGiOhJCJ Mailing-List via CMake < cmake@cmake.org> wrote: > 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 > -- > > Powered by www.kitware.com > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Kitware offers various services to support the CMake community. For more > information on each offering, please visit: > > CMake Support: http://cmake.org/cmake/help/support.html > CMake Consulting: http://cmake.org/cmake/help/consulting.html > CMake Training Courses: http://cmake.org/cmake/help/training.html > > Visit other Kitware open-source projects at http://www.kitware.com/ > opensource/opensource.html > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/cmake > -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
Re: [CMake] How to handle options with more than two possible values?
Thanks it works perfectly! On Thu, 13 Oct 2016 13:41:00 +0200 Petr Kmoch wrote: > Hi. > > option() is a handy shortcut for boolean options, but it's little more than > syntactic sugar for a cache variable of type BOOL. To create a tristate > variable, you can do this: > > set(ENABLE_SOMETHING AUTO CACHE STRING "Enable SOMETHING support") # > create the variable > set_property(CACHE ENABLE_SOMETHING PROPERTY STRINGS AUTO ON OFF) # > define list of values GUI will offer for the variable > > Then, you can test the variable like this: > > if(ENABLE_SOMETHING STREQUAL "AUTO") > # AUTO was used > elseif(ENABLE_SOMETHING) > # a true value (such as ON) was used > else() > # a false value (such as OFF) was used > endif() > > Hope this helps. > > Petr > > On 13 October 2016 at 13:32, YuGiOhJCJ Mailing-List via CMake < > cmake@cmake.org> wrote: > > > 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 > > -- > > > > Powered by www.kitware.com > > > > Please keep messages on-topic and check the CMake FAQ at: > > http://www.cmake.org/Wiki/CMake_FAQ > > > > Kitware offers various services to support the CMake community. For more > > information on each offering, please visit: > > > > CMake Support: http://cmake.org/cmake/help/support.html > > CMake Consulting: http://cmake.org/cmake/help/consulting.html > > CMake Training Courses: http://cmake.org/cmake/help/training.html > > > > Visit other Kitware open-source projects at http://www.kitware.com/ > > opensource/opensource.html > > > > Follow this link to subscribe/unsubscribe: > > http://public.kitware.com/mailman/listinfo/cmake > > -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
