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| <source lang="cmake">
| | {{CMake/Template/Moved}} |
| cmake_minimum_required(VERSION 2.6)
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| # The idea of this demo is to show how to set a group of CMake variables together.
| | This page has moved [https://gitlab.kitware.com/cmake/community/wikis/doc/tutorials/SettingVariableGroups here]. |
| # A common use case is to allow easy enabling/disabling of a large set of targets, while
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| # maintaining manual individual target control. This is in contrast to a BUILD_ALL style variable,
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| # where targets are build if a corresponding variable to the target is set, OR the BUILD_ALL variable
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| # is set. The problem with this method is that if you want to set "all but one" of the targets to ON,
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| # it is not possible without manually setting all N-1 of the targets to OFF.
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| PROJECT(VariablePrefix)
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| | |
| # Add options to build specific targets
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| option(build_Green "green")
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| option(build_Blue "blue")
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| # Add options to allow enabling/disabling of a set of targets
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| option(TurnOnAll "all")
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| option(TurnOffAll "all")
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| | |
| # A function to get all user defined variables with a specified prefix
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| function (getListOfVarsStartingWith _prefix _varResult)
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| get_cmake_property(_vars VARIABLES)
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| string (REGEX MATCHALL "(^|;)${_prefix}[A-Za-z0-9_]*" _matchedVars "${_vars}")
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| set (${_varResult} ${_matchedVars} PARENT_SCOPE)
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| endfunction()
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| | |
| # Mass toggle "commands". These variables (TurnOnAll and TurnOffAll) let you
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| # enable or disable all of the variables starting with "build_". This is an abuse
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| # of a CMake "variable" to be used as an instruction to issue a command once.
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| # For example, when TurnOnAll is set to ON and then configure is run, the following
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| # block is run once, and then TurnOnAll sets itself back to OFF.
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| if(TurnOnAll)
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| getListOfVarsStartingWith("build_" matchedVars)
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| foreach (_var IN LISTS matchedVars)
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| message("Turn on ${item}")
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| set(${_var} ON CACHE BOOL "test" FORCE) # "test" is here because I'm not sure how to preserve the docstring.
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| endforeach()
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| set(TurnOnAll OFF CACHE BOOL "test" FORCE) # Set itself back to off, as this is a one time thing. "test" is here because I'm not sure how to preserve the docstring.
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| endif()
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| | |
| # In exactly the same manner, if TurnOffAll is set to ON, all of the variables starting with build_ are set to OFF.
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| if(TurnOffAll)
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| getListOfVarsStartingWith("build_" matchedVars)
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| foreach (_var IN LISTS matchedVars)
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| message("Turn off ${item}")
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| set(${_var} OFF CACHE BOOL "test" FORCE) # "test" is here because I'm not sure how to preserve the docstring.
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| endforeach()
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| set(TurnOffAll OFF CACHE BOOL "test" FORCE) # Set itself back to off, as this is a one time thing. "test" is here because I'm not sure how to preserve the docstring.
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| endif()
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| | |
| # Of course turning on all variables at the same time as turning off all variables does not make sense.
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| if(TurnOnAllTargets AND TurnOffAllTargets)
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| message(FATAL_ERROR "You cannot turn targets on and off at the same time!")
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| endif()
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| | |
| # Conditional executables
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| if(build_Green)
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| ADD_EXECUTABLE(GreenLaser GroupVariables.cpp)
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| endif()
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| if(build_Blue)
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| ADD_EXECUTABLE(BlueLaser GroupVariables.cpp)
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| # other options here
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| endif()
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| </source>
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