$ cmake --version
cmake version 3.13.2

$ cmake -S src -B testON
ON is ON
-- Configuring done
-- Generating done
-- Build files have been written to:...

$ cat src/CMakeLists.txt
cmake_minimum_required(VERSION 3.12)

project(sample C)

if(ON)
  message("ON is ON")
endif()

What version are you using?

On Sat, Jan 26, 2019 at 10:39 AM Mario Emmenlauer <ma...@emmenlauer.de>
wrote:

>
> Dear All,
>
> I'm plagued by an issue that I do not understand. An if-statement
> (in a package configuration file) evaluates ON to false:
>
> IF(ON)
>     ...some code here
> ENDIF()
>
> The part inside IF is *not* executed. Replacing ON by TRUE does not
> help, only replacing it by 1 helps. Is this correct behaviour? I can
> not understand this from the documentation. The docs seem to say "ON"
> would be a valid token for true:
> https://cmake.org/cmake/help/v3.6/command/if.html
>
> The full user story is that in the package configuration I'd like to
> treat shared libraries specially, so I use "IF(@BUILD_SHARED_LIBS@)".
> The user configures the build with
>
>     cmake -DBUILD_SHARED_LIBS=ON .
>
> so the package configuration gets resolved to "IF(ON)". I have not
> too much control about the way users specify the options, so I'd
> like to solve this on my end. If options should not keep the value
> "ON", how can I cleanly resolve them to the corresponding number 0/1?
>
> Am I doing something wrong?
>
> All the best,
>
>     Mario Emmenlauer
>
>
> --
> BioDataAnalysis GmbH, Mario Emmenlauer     Tel. Office: +49-89-74677203
> Balanstr. 43                   mailto: memmenlauer * biodataanalysis.de
> D-81669 Munich                           http://www.biodataanalysis.de/
> --
>
> 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:
> https://cmake.org/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:
https://cmake.org/mailman/listinfo/cmake

Reply via email to