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| This document describes the recommended coding style for CMake files in KDE, i.e. CMakeLists.txt files and *.cmake files.
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| ==Indentation==
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| Indent all code correctly, i.e. the body of
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| * IF/ELSE/ENDIF
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| * FOREACH/ENDFOREACH
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| * WHILE/ENDWHILE
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| * MACRO/ENDMACRO
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| * FUNCTION/ENDFUNCTION (CMake 2.6)
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| Use spaces for indenting, 2, 3 or 4 spaces preferably. Use the same amount
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| of spaces for indenting as is used in the rest of the file.
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| ==Upper/lower casing==
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| CMake commands are case-insensitive (only the commands, not the arguments or variable names). So all the following versions work:
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| <syntaxhighlight lang="cmake">
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| add_executable(foo foo.c)
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| ADD_EXECUTABLE(bar bar.c)
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| Add_Executable(hello hello.c)
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| aDd_ExEcUtAbLe(blub blub.c)
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| </syntaxhighlight>
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| But this would be ugly.
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| In KDE the ''all-lowercase style is preferred''. The all-uppercase style is also ok. Mixing upper- and lowercase should not be done in KDE CMake files.
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| Although all-lowercase is preferred, if a file is apparently in all-uppercase style, then stay consistent and also use all-uppercase in this file.
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| ==(Not) Using pkg-config==
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| You are free to use pkg-config in FindXXX.cmake modules, as long as the following conditions are met:
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| * the FindXXX.cmake must also work without pkg-config, as long as the package is either installed to one of the default locations (as /usr or /usr/local) or if CMAKE_PREFIX_PATH is set accordingly
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| * use only FIND_PACKAGE(PkgConfig), don't use INCLUDE(UsePkgConfig), this one is deprecated
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| * make sure the variables created by PKG_CHECK_MODULES() are all prefixed with "PC_", so they don't mix up with other variables, e.g. set via FIND_PATH() etc.
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| * FindLibXml2.cmake as shipped with CMake 2.8.5 is a good example how pkg-config should be handled
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| * putting something like if(NOT WIN32) around the pkg-config stuff is not necessary (and should be removed if it is somewhere). If pkg-config is not found, e.g. on Windows, the macros simply do nothing.
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| ==Writing CMake Find-modules==
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| * Follow the style guide from CMake when writing some FindFoo.cmake module:
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| [http://www.cmake.org/cgi-bin/viewcvs.cgi/Modules/readme.txt?root=CMake&view=markup readme.txt]
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| * For checking the results inside the Find-module, the macro find_package_handle_standard_args() (coming with CMake) should be used, using the new extended syntax, which supports also version checking.
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| * Micro-optimizations like
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| <pre>
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| if(FOO_LIBRARY AND FOO_INCLUDE_DIR)
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| set(FOO_FOUND TRUE)
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| else()
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| ... execute the whole find-logic
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| endif()
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| </pre>
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| should be removed, the find-logic should be executed always. These shortcuts can cause problems e.g. when the same file is used from multiple directories but e.g. with different required versions or components etc.
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