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| While CMake itself is already very fast, there are some things you can do to ensure works
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| as fast as possible.
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| ==Build it with optimization enabled==
| | This page has moved [https://gitlab.kitware.com/cmake/community/wikis/doc/cmake/Performance-Tips here]. |
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| Ok, this is obvious, but anyway. Let's say you build CMake yourself without any special settings, e.g.
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| <pre>
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| $ cmake ..
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| $ make
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| </pre>
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| If you do it this way, you will get a CMake with optimizations turned off.
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| There are different ways to get an optimized build. You can select one of the predefined build types:
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| <pre>
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| $ cmake -DCMAKE_BUILD_TYPE=RELEASE ..
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| $ make
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| </pre>
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| Also possible are RELWITHDEBINFO and MINSIZEREL.
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| or
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| <pre>
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| $ export CXXFLAGS=-O2
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| $ cmake ..
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| $ make
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| </pre>
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| or
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| <pre>
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| $ export CXXFLAGS=-O2
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| $ cmake ..
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| $ make edit_cache (or ccmake ..)
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| ... edit CMAKE_CXX_FLAGS in the advanced view
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| $ make
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| </pre>
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| CMake built with optimizations enabled can give you an almost 50% performance boost (time for running
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| CMake on VTK went down from 25 s to 14 s).
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| ==Use LIST(APPEND ...)==
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| There are two ways to append values to a variable in CMake:
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| <pre>
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| SET(myVar ${myVar} newItem)
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| </pre>
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| and since CMake 2.4 there is the new LIST() command:
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| <pre>
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| LIST(APPEND myVar newItem)
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| </pre>
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| LIST(APPEND ...) is for large lists and many appends much faster than the method using SET().
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Latest revision as of 15:41, 30 April 2018
