Where conditions is a comma-separated list of boolean expressions.Įvaluates to 1 if at least one of the conditions is 1. The whole expressionĮvaluates to 1 if all conditions are 1. Where conditions is a comma-separated list of boolean expressions,Īll of which must evaluate to either 1 or 0. The common boolean logic operators are supported: $ ¶ $: - DENABLE_SOME_FEATURE > Logical Operators ¶ Information specific to each build configuration. Setting the STRINGS property on it to a set of three options.Generator expressions are evaluated during build system generation to produce This by creating a property named CRYPTOBACKEND as usual, and then The following CMakeLists code illustrates In some cases, you might want to restrict a cache entry to a limited Mark_as_advanced command is used with the name of the variable Property lets a software project divide them into key options for most usersĪnd advanced options for advanced users. Large software project to have fifty or more options, and the advanced That the user can modify, but typically will not. The advanced cache entries are other options This is so the user can focus on the cache entries that The cmake-gui are run, the advanced cache entriesĪre not displayed. Variables that are in the cache also have a property indicating if # assume that FOO is set to ON in the cache set( FOO OFF ) # sets foo to OFF for processing this CMakeLists file # and subdirectories the value in the cache stays ON The setĬommand will define a variable for the current scope without changing Referenced variable is not defined in the current scope. Still be overridden in a CMakeLists file using the set command Set command to override and change the cache value of a variable.Ī few final points should be made concerning variables and their Value, use the FORCE option in combination with the CACHE In the rare event that you really want to change a cached variable’s The variable is in the cache, that command will have no effect. Only do something when the cache doesn’t have the variable in it. A set(FOO ON CACHE BOOL "doc") command will typically The user would never be able to make a change that CMake wouldn’t Invocation of CMake overwrote their change back to the set value, The user may then modify that value from the GUI. Once CMake has put the variable into the cache with its initial value, Once a variable is in the cache, its “cache” value cannot normally be Second, cache filesĬontain full paths which make them unsuitable for moving between Syntax of the CMake cache is subject to change. Not work and could cause additional problems in the future. “initialize” a project by giving it an initial cache file. You might be tempted to edit the cache file directly, or to For some complicated ones it may be twice or more. The rule is to keepīuilding the cache until it doesn’t change. New options will appear for MPI that they can then set. Option in the cache area, if the user turns that on and re-configures with CMake, So, to avoid confusionįor people who don’t know what MPI is, those options are hidden until Option VTK_USE_PARALLEL is first turned on in VTK. The build process to determine where the MPI libraries and header files areĪnd to let the user adjust their values. Supports the use of MPI for performing distributed computing. New options to appear the next time the cache is built. Some projects are very complex and setting one value in the cache may cause Probably all of your binary tree’s object files, libraries, and If you significantly change yourĬomputer, either by changing the operating system or switching to aĭifferent compiler, you will need to delete the cache file (and Variables to properties that should never change (such as the byte Have been determined, they are stored in the cache to avoid having to recompute Typically, these values are system-dependent variables that requireĬMake to compile and run a program to determine their value. These entries may not be visible or adjustable by The type of the variable is used by theĬmake-gui to control how that variable is set andĭisplayed, but the value is always stored in the cache file as a string.Īnother purpose of the cache is to allow CMake itself to persistently store When you use the CACHE option, you may also provide the type of the Set( USE_JPEG ON CACHE BOOL "include jpeg support?" )
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