summaryrefslogtreecommitdiffstats
path: root/Help/release/3.12.rst
blob: e460d81d167388195d0a53851beadc7e3cff4fa8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
CMake 3.12 Release Notes
************************

.. only:: html

  .. contents::

Changes made since CMake 3.11 include the following.

New Features
============

Generators
----------

* The :ref:`Visual Studio Generators` for VS 2017 learned to support a
  ``version=14.##`` option in the :variable:`CMAKE_GENERATOR_TOOLSET`
  value (e.g. via the :manual:`cmake(1)` ``-T`` option) to specify a
  toolset version number.

Command-Line
------------

* The :manual:`cmake(1)` :ref:`Build Tool Mode` (``cmake --build``) gained
  ``--parallel [<jobs>]`` and ``-j [<jobs>]`` options to specify a parallel
  build level.  They map to corresponding options of the native build tool.

Commands
--------

* The :command:`add_compile_definitions` command was added to set preprocessor
  definitions at directory level.  This supersedes :command:`add_definitions`.

* The :command:`cmake_minimum_required` and :command:`cmake_policy(VERSION)`
  commands now accept a version range using the form ``<min>[...<max>]``.
  The ``<min>`` version is required but policies are set based on the
  ``<max>`` version.  This allows projects to specify a range of versions
  for which they have been updated and avoid explicit policy settings.

* The :command:`file(GLOB)` and :command:`file(GLOB_RECURSE)` commands
  learned a new flag ``CONFIGURE_DEPENDS`` which enables expression of
  build system dependency on globbed directory's contents.

* The :command:`file(TOUCH)` and :command:`file(TOUCH_NOCREATE)` commands
  were added to expose ``TOUCH`` functionality without having to use
  CMake's command-line tool mode with :command:`execute_process`.

* The :command:`find_package` command now searches a prefix specified by
  a ``PackageName_ROOT`` CMake or environment variable.  Package roots are
  maintained as a stack so nested calls to all ``find_*`` commands inside
  find modules also search the roots as prefixes.
  See policy :policy:`CMP0074`.

* The :command:`install` command learned an optional ``NAMELINK_COMPONENT``
  parameter, which allows you to change the component for a shared library's
  namelink. If none is specified, the value of ``COMPONENT`` is used by
  default.

* The :command:`list` command learned a ``JOIN`` sub-command
  to concatenate list's elements separated by a glue string.

* The :command:`list` command learned a ``SUBLIST`` sub-command
  to get a sublist of the list.

* The :command:`list` command learned a ``TRANSFORM`` sub-command
  to apply various string transformation to list's elements.

* The :command:`project` command learned an optional ``HOMEPAGE_URL``
  parameter which has the effect of setting variables like
  :variable:`PROJECT_HOMEPAGE_URL`, :variable:`<PROJECT-NAME>_HOMEPAGE_URL`
  and :variable:`CMAKE_PROJECT_HOMEPAGE_URL`.

* The :command:`string` command learned a ``JOIN`` sub-command
  to concatenate input strings separated by a glue string.

* :command:`target_compile_options` and :command:`add_compile_options`
  commands gained a ``SHELL:`` prefix to specify a group of related
  options using shell-like quoting.

* The :command:`target_link_libraries` command now supports
  :ref:`Object Libraries`.  Linking to an object library uses its object
  files in direct dependents and also propagates usage requirements.

* The :command:`target_link_libraries` command may now be called
  to modify targets created outside the current directory.

Variables
---------

* The :variable:`CMAKE_FOLDER` variable was added to initialize the
  :prop_tgt:`FOLDER` property on all targets.

* The :variable:`CMAKE_DOTNET_TARGET_FRAMEWORK_VERSION` variable
  was defined to initialize all
  :prop_tgt:`DOTNET_TARGET_FRAMEWORK_VERSION` target properties.

* ``CMAKE_PROJECT_VERSION*`` variables have been introduced:

  - :variable:`CMAKE_PROJECT_VERSION`
  - :variable:`CMAKE_PROJECT_VERSION_MAJOR`
  - :variable:`CMAKE_PROJECT_VERSION_MINOR`
  - :variable:`CMAKE_PROJECT_VERSION_PATCH`
  - :variable:`CMAKE_PROJECT_VERSION_TWEAK`

* The :variable:`CMAKE_SUPPRESS_REGENERATION` variable was extended to
  support the :generator:`Ninja` and :ref:`Makefile Generators`.
  It is also now documented.

* ``CMAKE_VS_SDK_*_DIRECTORIES`` variables were defined to tell
  :ref:`Visual Studio Generators` for VS 2010 and above how to populate
  fields in ``.vcxproj`` files that specify SDK directories.  The
  variables are:

  - :variable:`CMAKE_VS_SDK_EXCLUDE_DIRECTORIES`
  - :variable:`CMAKE_VS_SDK_EXECUTABLE_DIRECTORIES`
  - :variable:`CMAKE_VS_SDK_INCLUDE_DIRECTORIES`
  - :variable:`CMAKE_VS_SDK_LIBRARY_DIRECTORIES`
  - :variable:`CMAKE_VS_SDK_LIBRARY_WINRT_DIRECTORIES`
  - :variable:`CMAKE_VS_SDK_REFERENCE_DIRECTORIES`
  - :variable:`CMAKE_VS_SDK_SOURCE_DIRECTORIES`

* A :variable:`MSVC_TOOLSET_VERSION` variable was added to provide the
  MSVC toolset version associated with the current MSVC compiler version
  in :variable:`MSVC_VERSION`.

Properties
----------

* The :prop_tgt:`COMMON_LANGUAGE_RUNTIME` target property was introduced
  to configure the use of managed C++ for :ref:`Visual Studio Generators`
  for VS 2010 and above.
  A corresponding :prop_tgt:`IMPORTED_COMMON_LANGUAGE_RUNTIME` target
  property was added to support ``C++/CLI`` for imported targets.

* The :prop_tgt:`DOTNET_TARGET_FRAMEWORK_VERSION` target property
  was introduced as replacement for
  :prop_tgt:`VS_DOTNET_TARGET_FRAMEWORK_VERSION`, which is considered
  deprecated now.

* An :prop_tgt:`EXPORT_PROPERTIES` target property was added to specify a
  custom list of target properties to include in targets exported by the
  :command:`install(EXPORT)` and :command:`export` commands.

* The :prop_tgt:`PDB_OUTPUT_DIRECTORY` property learned to support
  :manual:`generator expressions <cmake-generator-expressions(7)>`.

* A :prop_dir:`TESTS` directory property was added to hold the list of
  tests defined by the :command:`add_test` command.

* A :prop_tgt:`VS_DEBUGGER_COMMAND` target property was created to set the
  debugging command line with :ref:`Visual Studio Generators` for VS 2010
  and above.

* HLSL source file properties :prop_sf:`VS_SHADER_DISABLE_OPTIMIZATIONS`
  and :prop_sf:`VS_SHADER_ENABLE_DEBUG` gained support for generator
  expressions.

* HLSL source file property :prop_sf:`VS_SHADER_OBJECT_FILE_NAME` has been
  added to the :ref:`Visual Studio Generators` for VS 2010 and above.
  The property specifies the file name of the compiled shader object.

Modules
-------

* The :module:`FindALSA` module now provides imported targets.

* The :module:`FindCURL` module now provides imported targets.

* The :module:`FindJPEG` module now provides imported targets.

* The :module:`FindLibXml2` module now provides imported targets.

* A :module:`FindODBC` module was added to find an Open Database Connectivity
  (ODBC) library.

* The :module:`FindPkgConfig` module has learned to export the found
  libraries with full path for direct consumption with the
  :command:`target_link_libraries` command.

* New :module:`FindPython3` and :module:`FindPython2` modules, as well as
  a new :module:`FindPython` module, have been added to provide a new way
  to locate python environments.

* The :module:`UseSWIG` module gained a whole refresh and is now more
  consistent with standard CMake commands to generate libraries and is
  fully configurable through properties.

* The :module:`UseSWIG` module learned to manage multiple behaviors through
  ``UseSWIG_MODULE_VERSION`` variable to ensure legacy support as well as more
  robust handling of ``SWIG`` advanced features (like ``%template``).

* The :module:`WriteCompilerDetectionHeader` module gained a ``BARE_FEATURES``
  option to add a compatibility define for the exact keyword of a new language
  feature.

Generator Expressions
---------------------

* A new ``$<GENEX_EVAL:...>`` and ``$<TARGET_GENEX_EVAL:target,...>``
  :manual:`generator expression <cmake-generator-expressions(7)>`
  has been added to enable consumption of generator expressions whose
  evaluation results itself in generator expressions.

* A new ``$<IN_LIST:...>``
  :manual:`generator expression <cmake-generator-expressions(7)>`
  has been added.

* A new ``$<TARGET_EXISTS:...>``
  :manual:`generator expression <cmake-generator-expressions(7)>`
  has been added.

* A new ``$<TARGET_NAME_IF_EXISTS:...>``
  :manual:`generator expression <cmake-generator-expressions(7)>`
  has been added.

CTest
-----

* The :command:`ctest_start` command has been reworked so that you can simply
  call ``ctest_start(APPEND)`` and it will read all the needed information from
  the TAG file. The argument parsing has also been relaxed so that the order of
  the arguments is less significant.

* A :prop_test:`PROCESSOR_AFFINITY` test property was added to request
  that CTest run a test with CPU affinity for a set of processors
  disjoint from other concurrently running tests with the property set.

CPack
-----

* The :module:`CPack` module now uses variables
  :variable:`CMAKE_PROJECT_VERSION_MAJOR`,
  :variable:`CMAKE_PROJECT_VERSION_MINOR` and
  :variable:`CMAKE_PROJECT_VERSION_PATCH`
  to initialize corresponding CPack variables.

* :manual:`cpack(1)` gained basic support for `NuGet`_.
  See the :module:`CPackNuGet` module.

.. _NuGet: https://docs.microsoft.com/en-us/nuget/what-is-nuget

Other
-----

* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
  is now aware of C++ 20.  No specific features are yet enumerated besides
  the ``cxx_std_20`` meta-feature.

* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
  is now aware of the availability of C features in MSVC since VS 2010.

* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
  is now aware of C language standards supported by Texas Instruments C
  compilers.

Deprecated and Removed Features
===============================

* The :generator:`Visual Studio 8 2005` generator has been removed.

* CMake no longer produces ``<tgt>_LIB_DEPENDS`` cache entries
  for library targets.  See policy :policy:`CMP0073`.

Other Changes
=============

* Include flags for directories marked as ``SYSTEM`` are now moved after
  non-system directories.  The ``-isystem`` flag does this automatically,
  so moving them explicitly to the end makes the behavior consistent on
  compilers that do not have any ``-isystem`` flag.

* Fortran dependency scanning now supports dependencies implied by
  `Fortran Submodules`_.

* The existence and functionality of the file
  ``${CMAKE_BINARY_DIR}/cmake_install.cmake`` has now been documented in the
  :command:`install` documentation so that external packaging software can take
  advantage of CPack-style component installs.

* The :module:`CheckIncludeFile` module ``check_include_file`` macro
  learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable.
  See policy :policy:`CMP0075`.

* The :module:`CheckIncludeFileCXX` module ``check_include_file_cxx`` macro
  learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable.
  See policy :policy:`CMP0075`.

* The :module:`CheckIncludeFiles` module ``check_include_files`` macro
  learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable.
  See policy :policy:`CMP0075`.

* The :manual:`cmake(1)` ``-E copy_directory`` tool now fails when the
  source directory does not exist.  Previously it succeeded by creating
  an empty destination directory.

* The :module:`UseSWIG` module :command:`swig_add_library` command
  (and legacy ``swig_add_module`` command) now set the prefix of
  Java modules to ``""`` for MINGW, MSYS, and CYGWIN environments.

.. _`Fortran Submodules`: http://fortranwiki.org/fortran/show/Submodules