Adding what's new in CMake
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Henry Fredrick Schreiner
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* [An Introduction to Modern CMake](README.md)
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* [Installing CMake](chapters/installing.md)
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* [Running CMake](chapters/running.md)
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* [What's new in CMake](chapters/newcmake.md)
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---
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# What's new in in CMake
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This is an abbreviated version of the CMake changlog with just the highlights for authors. Names for each release are arbitrarily picked by the author.
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## [CMake 3.0] : Interface libraries
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There were a ton of additions to this version of CMake, primarily to fill out the target interface. Some bits of needed functionality were missed and implemented in CMake 3.1 instead.
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* New documentation
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* INTERFACE libraries
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* Project VERSION support
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* Exporting build trees easily
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* Bracket arguments and comments available (not widely used)
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* Lots of improvements
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## [CMake 3.1] : C++11 and compile features
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This is the first release of CMake to support C++11. Combined with fixes to the new features of CMake 3.0, this is currently a common minimum version of CMake for libraries that want to support old CMake builds.
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* C++11 Support
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* Compile features support
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* Sources can be added later with `target_sources`
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* Better support for generator expressions and INTERFACE targets
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## [CMake 3.2] : UTF8
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This is a smaller release, with mostly small features and fixes. Internal changes, like better Windows and UTF8 support, were the focus.
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* `continue()` inside loops
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* File and directory locks added
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## [CMake 3.3] : if IN_LIST
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This is notable for the useful `IN_LIST` option for if, but it also added better library search using `$PATH` (See CMake 3.6), dependencies for INTERFACE libraries, and several other useful improvements. The addition of a `COMPILE_LANGUAGE` generator expression would prove very useful in the future as more languages are added. Makefiles now produce better output in parallel.
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* `IN_LIST` added to `if`
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* `*_INCLUDE_WHAT_YOU_USE` property added
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* `COMPILE_LANGUAGE` generator expression (limited support in some generators)
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## [CMake 3.4] : Swift & CCache
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This release adds lots of useful tools, support for the Swift language, and the usual improvements. It also started supporting compiler launchers, like CCache.
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* Added `Swift` language
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* Added `BASE_DIR` to `get_filename_component`
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* `if(TEST ...)` added
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* `string(APPEND ...)` added
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* `CMAKE_*_COMPILER_LAUNCHER` added for make and ninja
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* `TARGET_MESSAGES` allow makefiles to print messages after target is completed
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* Imported targets are beginning to show up in the official `Find*.cmake` files
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## [CMake 3.5] : ARM
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This release expanded CMake to more platforms, and make warnings easier to control from the command line.
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* Multiple input files supported for several of the `cmake -E` commands.
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* `cmake_parse_arguments` now builtin
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* Boost, GTest, and more now support imported targets
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* ARMCC now supported, better support for iOS
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* XCode backslash fix
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## [CMake 3.6] : Clang-Tidy
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This release added Clang-Tidy support, along with more utilities and improvements. It also removed the search of `$PATH` on Unix systems due to problems, instead users should use `$CMAKE_PREFIX_PATH`.
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* `EXCLUDE_FROM_ALL` for install
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* `list(FILTER` added
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* `CMAKE_*_STANDARD_INCLUDE_DIRECTORIES` and `CMAKE_*_STANDARD_LIBRARIES` added for toolchains
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* Try-compile improvements
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* `*_CLANG_TIDY` property added
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* External projects can now be shallow clones, and other improvements
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## [CMake 3.7] : Android & CMake Server
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You can now cross-compile to Android. Useful new if statement options really help clarify code. And the new server mode should (eventually?) improve integration with IDEs. Support for the VIM editor was also improved.
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* `PARSE_ARGV` mode for `cmake_parse_arguments`
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* Better 32-bit support on 64-bit machines
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* Lots of useful new if comparisons, like `VERSION_GREATER_EQUAL` (really, why did it take this long?)
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* `LINK_WHAT_YOU_USE` added
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* Lots of custom properties related to files and directories
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* CMake Server added
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## [CMake 3.8] : C# and CUDA
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This adds CUDA as a language, as well as `cxx_std_11` as a compiler meta-feature. The new generator expression could be really useful if you can require CMake 3.8+!
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* Native support for C# as a language
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* Native support for CUDA as a language
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* Meta features cxx_std_11 (and 14, 17) added
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* `try_compile` has better language support
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* `BUILD_RPATH` property added
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* `COMPILE_FLAGS` now supports generator expression
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* `*_CPPLINT` added
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* `$<IF:cond,true-value,false-value>` added (wow!)
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## [CMake 3.9] : IPO
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Lots of fixes to CUDA support went into this release, including `PTX` support and MSVC generators. Interprocedural Optimizations are now supported properly.
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Even more modules provide imported targets, including MPI.
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* CUDA supported for Windows
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* Better object library support in several situations
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* `DESCRIPTION` added to `project`
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* `seperate_arguments` gets `NATIVE_COMMAND`
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* `INTERPROCEDURAL_OPTIMIZATION` enforced (and `CMAKE_*` initializer added, CheckIPOSupported added, Clang and GCC support)
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* New `GoogleTest` module
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* `FindDoxygen` drastically improved
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## [CMake 3.10] : CppCheck
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CMake now is built with C++11 compilers. Lots of useful improvements help write cleaner code.
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* Support for flang Fortran compiler
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* Compiler launcher added to CUDA
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* Indented `#cmakedefines` now supported for `configure_file`
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* `include_guard()` added to ensure a file gets included only once
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* `string(PREPEND` added
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* `*_CPPCHECK` property added
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* `LABELS` added to directories
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* FindMPI vastly expanded
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* FindOpenMP improved
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* Dynamic test discovery for `GoogleTest`
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## [CMake 3.11] : Faster
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This release is [supposed to be][fastercmake] much faster. You can also finally directly add INTERFACE targets
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to IMPORTED libraries (the internal `Find*.cmake` scripts should become much cleaner eventually).
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* Fortran supports compiler launchers
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* Xcode and Visual Studio support `COMPILE_LANGUAGE` generator expressions finally
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* You can now add INTERFACE targets directly to IMPORTED INTERFACE libraries (Wow!)
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* Source file properties have been expanded
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* `FetchContent` module now allows downloads to happen at configure time (Wow)
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[Releases]: https://cmake.org/cmake/help/latest/release/index.html
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[CMake 3.0]: https://cmake.org/cmake/help/latest/release/3.0.html
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[CMake 3.1]: https://cmake.org/cmake/help/latest/release/3.1.html
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[CMake 3.2]: https://cmake.org/cmake/help/latest/release/3.2.html
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[CMake 3.3]: https://cmake.org/cmake/help/latest/release/3.3.html
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[CMake 3.4]: https://cmake.org/cmake/help/latest/release/3.4.html
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[CMake 3.5]: https://cmake.org/cmake/help/latest/release/3.5.html
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[CMake 3.6]: https://cmake.org/cmake/help/latest/release/3.6.html
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[CMake 3.7]: https://cmake.org/cmake/help/latest/release/3.7.html
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[CMake 3.8]: https://cmake.org/cmake/help/latest/release/3.8.html
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[CMake 3.9]: https://cmake.org/cmake/help/latest/release/3.9.html
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[CMake 3.10]: https://cmake.org/cmake/help/latest/release/3.10.html
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[CMake 3.11]: https://cmake.org/cmake/help/latest/release/3.11.html
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[fastercmake]: https://blog.kitware.com/improving-cmakes-runtime-performance/
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