CMake/ChangeLog
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CMake 3.0.0 Release Notes
*************************
Changes made since CMake 2.8.12.2 include the following.
Documentation Changes
=====================
* The CMake documentation has been converted to reStructuredText and
now transforms via Sphinx (http://sphinx-doc.org) into man and html
pages. This allows the documentation to be properly indexed and to
contain cross-references.
Conversion from the old internal documentation format was done by an
automatic process so some documents may still contain artifacts.
They will be updated incrementally over time.
A basic reStructuredText processor has been implemented to support
"cmake --help-command" and similar command-line options.
* New manuals were added:
* "cmake-buildsystem(7)"
* "cmake-commands(7)", replacing "cmakecommands(1)" and
"cmakecompat(1)"
* "cmake-developer(7)"
* "cmake-generator-expressions(7)"
* "cmake-generators(7)"
* "cmake-language(7)"
* "cmake-modules(7)", replacing "cmakemodules(1)"
* "cmake-packages(7)"
* "cmake-policies(7)", replacing "cmakepolicies(1)"
* "cmake-properties(7)", replacing "cmakeprops(1)"
* "cmake-qt(7)"
* "cmake-toolchains(7)"
* "cmake-variables(7)", replacing "cmakevars(1)"
* Release notes for CMake 3.0.0 and above will now be included with
the html documentation.
New Features
============
Syntax
------
* The CMake language has been extended with *Bracket Argument* and
*Bracket Comment* syntax inspired by Lua long brackets:
set(x [===[bracket argument]===] #[[bracket comment]])
Content between equal-length open- and close-brackets is taken
literally with no variable replacements.
Warning: This syntax change could not be made in a fully
compatible way. No policy is possible because syntax parsing
occurs before any chance to set a policy. Existing code using an
unquoted argument that starts with an open bracket will be
interpreted differently without any diagnostic. Fortunately the
syntax is obscure enough that this problem is unlikely in
practice.
Generators
----------
* A new "CodeLite" extra generator is available for use with the
Makefile or Ninja generators.
* A new "Kate" extra generator is available for use with the
Makefile or Ninja generators.
* The "Ninja" generator learned to use "ninja" job pools when
specified by a new "JOB_POOLS" global property.
Commands
--------
* The "add_library()" command learned a new "INTERFACE" library
type. Interface libraries have no build rules but may have
properties defining "usage requirements" and may be installed,
exported, and imported. This is useful to create header-only
libraries that have concrete link dependencies on other libraries.
* The "export()" command learned a new "EXPORT" mode that retrieves
the list of targets to export from an export set configured by the
"install(TARGETS)" command "EXPORT" option. This makes it easy to
export from the build tree the same targets that are exported from
the install tree.
* The "export()" command learned to work with multiple dependent
export sets, thus allowing multiple packages to be built and
exported from a single tree. The feature requires CMake to wait
until the generation step to write the output file. This means one
should not "include()" the generated targets file later during
project configuration because it will not be available. Use *Alias
Targets* instead. See policy "CMP0024".
* The "install(FILES)" command learned to support "generator
expressions" in the list of files.
* The "project()" command learned to set some version variables to
values specified by the new "VERSION" option or to empty strings.
See policy "CMP0048".
* The "string()" command learned a new "CONCAT" mode. It is
particularly useful in combination with the new *Bracket Argument*
syntax.
* The "unset()" command learned a "PARENT_SCOPE" option matching
that of the "set()" command.
* The "include_external_msproject()" command learned to handle
non-C++ projects like ".vbproj" or ".csproj".
* The "ctest_update()" command learned to update work trees managed
by the Perforce (p4) version control tool.
* The "message()" command learned a "DEPRECATION" mode. Such
messages are not issued by default, but may be issued as a warning
if "CMAKE_WARN_DEPRECATED" is enabled, or as an error if
"CMAKE_ERROR_DEPRECATED" is enabled.
* The "target_link_libraries()" command now allows repeated use of
the "LINK_PUBLIC" and "LINK_PRIVATE" keywords.
Variables
---------
* Variable "CMAKE_FIND_NO_INSTALL_PREFIX" has been introduced to
tell CMake not to add the value of "CMAKE_INSTALL_PREFIX" to the
"CMAKE_SYSTEM_PREFIX_PATH" variable by default. This is useful when
building a project that installs some of its own dependencies to
avoid finding files it is about to replace.
* Variable "CMAKE_STAGING_PREFIX" was introduced for use when cross-
compiling to specify an installation prefix on the host system that
differs from a "CMAKE_INSTALL_PREFIX" value meant for the target
system.
* Variable "CMAKE_SYSROOT" was introduced to specify the toolchain
SDK installation prefix, typically for cross-compiling. This is used
to pass a "--sysroot" option to the compiler and as a prefix
searched by "find_*" commands.
* Variable "CMAKE_<LANG>_COMPILER_TARGET" was introduced for use
when cross-compiling to specify the target platform in the
*toolchain file* specified by the "CMAKE_TOOLCHAIN_FILE" variable.
This is used to pass an option such as "--target=<triple>" to some
cross- compiling compiler drivers.
* Variable "CMAKE_MAP_IMPORTED_CONFIG_<CONFIG>" has been introduced
to optionally initialize the "MAP_IMPORTED_CONFIG_<CONFIG>" target
property.
Properties
----------
* The "ADDITIONAL_MAKE_CLEAN_FILES" directory property learned to
support "generator expressions".
* A new directory property "CMAKE_CONFIGURE_DEPENDS" was introduced
to allow projects to specify additional files on which the
configuration process depends. CMake will re-run at build time when
one of these files is modified. Previously this was only possible to
achieve by specifying such files as the input to a
"configure_file()" command.
* A new *AUTORCC* feature replaces the need to invoke
"qt4_add_resources()" by allowing ".qrc" files to be listed as
target sources.
* A new *AUTOUIC* feature replaces the need to invoke
"qt4_wrap_ui()".
* Test properties learned to support "generator expressions". This
is useful to specify per-configuration values for test properties
like "REQUIRED_FILES" and "WORKING_DIRECTORY".
* A new "SKIP_RETURN_CODE" test property was introduced to tell
"ctest(1)" to treat a particular test return code as if the test
were not run. This is useful for test drivers to report that
certain test requirements were not available.
* New types of *Compatible Interface Properties* were introduced,
namely the "COMPATIBLE_INTERFACE_NUMBER_MAX" and
"COMPATIBLE_INTERFACE_NUMBER_MIN" for calculating numeric maximum
and minimum values respectively.
Modules
-------
* The "CheckTypeSize" module "check_type_size" macro and the
"CheckStructHasMember" module "check_struct_has_member" macro
learned a new "LANGUAGE" option to optionally check C++ types.
* The "ExternalData" module learned to work with no URL templates if
a local store is available.
* The "ExternalProject" function "ExternalProject_Add" learned a new
"GIT_SUBMODULES" option to specify a subset of available submodules
to checkout.
* A new "FindBacktrace" module has been added to support
"find_package(Backtrace)" calls.
* A new "FindLua" module has been added to support
"find_package(Lua)" calls.
* The "FindBoost" module learned a new "Boost_NAMESPACE" option to
change the "boost" prefix on library names.
* The "FindBoost" module learned to control search for libraies with
the "g" tag (for MS debug runtime) with a new
"Boost_USE_DEBUG_RUNTIME" option. It is "ON" by default to preserve
existing behavior.
* The "FindJava" and "FindJNI" modules learned to use a "JAVA_HOME"
CMake variable or environment variable, and then try
"/usr/libexec/java_home" on OS X.
* The "UseJava" module "add_jar" function learned a new "MANIFEST"
option to pass the "-m" option to "jar".
* A new "CMakeFindDependencyMacro" module was introduced with a
"find_dependency" macro to find transitive dependencies in a
"package configuration file". Such dependencies are omitted by the
listing of the "FeatureSummary" module.
* The "FindQt4" module learned to create *Imported Targets* for Qt
executables. This helps disambiguate when using multiple "Qt
versions" in the same buildsystem.
Generator Expressions
---------------------
* New "$<PLATFORM_ID>" and "$<PLATFORM_ID:...>" "generator
expressions" have been added.
* The "$<CONFIG>" "generator expression" now has a variant which
takes no argument. This is equivalent to the "$<CONFIGURATION>"
expression.
* New "$<UPPER_CASE:...>" and "$<LOWER_CASE:...>" "generator
expressions" generator expressions have been added.
* A new "$<MAKE_C_IDENTIFIER:...>" "generator expression" has been
added.
Other
-----
* The "cmake(1)" "-E" option learned a new "sleep" command.
* The "ccmake(1)" dialog learned to honor the "STRINGS" cache entry
property to cycle through the enumerated list of possible values.
* The "cmake-gui(1)" dialog learned to remember window settings
between sessions.
* The "cmake-gui(1)" dialog learned to remember the type of a cache
entry for completion in the "Add Entry" dialog.
New Diagnostics
===============
* Directories named in the "INTERFACE_INCLUDE_DIRECTORIES" target
property of imported targets linked conditionally by a "generator
expression" were not checked for existence. Now they are checked.
See policy "CMP0027".
* Build target names must now match a validity pattern and may no
longer conflict with CMake-defined targets. See policy "CMP0037".
* Build targets that specify themselves as a link dependency were
silently accepted but are now diagnosed. See "CMP0038".
* The "target_link_libraries()" command used to silently ignore
calls specifying as their first argument build targets created by
"add_custom_target()" but now diagnoses this mistake. See policy
"CMP0039".
* The "add_custom_command()" command used to silently ignore calls
specifying the "TARGET" option with a non-existent target but now
diagnoses this mistake. See policy "CMP0040".
* Relative paths in the "INTERFACE_INCLUDE_DIRECTORIES" target
property used to be silently accepted if they contained a "generator
expression" but are now rejected. See policy "CMP0041".
* The "get_target_property()" command learned to reject calls
specifying a non-existent target. See policy "CMP0045".
* The "add_dependencies()" command learned to reject calls
specifying a dependency on a non-existent target. See policy
"CMP0046".
* Link dependency analysis learned to assume names containing "::"
refer to *Alias Targets* or *Imported Targets*. It will now produce
an error if such a linked target is missing. Previously in this
case CMake generated a link line that failed at build time. See
policy "CMP0028".
* When the "project()" or "enable_language()" commands initialize
support for a language, it is now an error if the full path to the
compiler cannot be found and stored in the corresponding
"CMAKE_<LANG>_COMPILER" variable. This produces nicer error
messages up front and stops processing when no working compiler is
known to be available.
* Target sources specified with the "add_library()" or
"add_executable()" command learned to reject items which require an
undocumented extra layer of variable expansion. See policy
"CMP0049".
* Use of "add_custom_command()" undocumented "SOURCE" signatures now
results in an error. See policy "CMP0050".
Deprecated and Removed Features
===============================
* Compatibility options supporting code written for CMake versions
prior to 2.4 have been removed.
* Several long-outdated commands that should no longer be called
have been disallowed in new code by policies:
* Policy "CMP0029" disallows "subdir_depends()"
* Policy "CMP0030" disallows "use_mangled_mesa()"
* Policy "CMP0031" disallows "load_command()"
* Policy "CMP0032" disallows "output_required_files()"
* Policy "CMP0033" disallows "export_library_dependencies()"
* Policy "CMP0034" disallows "utility_source()"
* Policy "CMP0035" disallows "variable_requires()"
* Policy "CMP0036" disallows "build_name()"
* The "cmake(1)" "-i" wizard mode has been removed. Instead use an
interactive dialog such as "ccmake(1)" or use the "-D" option to set
cache values from the command line.
* The builtin documentation formatters that supported command-line
options such as "--help-man" and "--help-html" have been removed in
favor of the above-mentioned new documentation system. These and
other command-line options that used to generate man- and html-
formatted pages no longer work. The "cmake(1)" "--help-custom-
modules" option now produces a warning at runtime and generates a
minimal document that reports the limitation.
* The "COMPILE_DEFINITIONS_<CONFIG>" directory properties and the
"COMPILE_DEFINITIONS_<CONFIG>" target properties have been
deprecated. Instead set the corresponding "COMPILE_DEFINITIONS"
directory property or "COMPILE_DEFINITIONS" target property and use
"generator expressions" like "$<CONFIG:...>" to specify per-
configuration definitions. See policy "CMP0043".
* The "LOCATION" target property should no longer be read from non-
IMPORTED targets. It does not make sense in multi-configuration
generators since the build configuration is not known while
configuring the project. It has been superseded by the
"$<TARGET_FILE>" generator expression. See policy "CMP0026".
* The "COMPILE_FLAGS" target property is now documented as
deprecated, though no warning is issued. Use the "COMPILE_OPTIONS"
target property or the "target_compile_options()" command instead.
* The "GenerateExportHeader" module "add_compiler_export_flags"
function is now deprecated. It has been superseded by the
"<LANG>_VISIBILITY_PRESET" and "VISIBILITY_INLINES_HIDDEN" target
properties.
Other Changes
=============
* The version scheme was changed to use only two components for the
feature level instead of three. The third component will now be
used for bug-fix releases or the date of development versions. See
the "CMAKE_VERSION" variable documentation for details.
* The default install locations of CMake itself on Windows and OS X
no longer contain the CMake version number. This allows for easy
replacement without re-generating local build trees manually.
* Generators for Visual Studio 10 (2010) and later were renamed to
include the product year like generators for older VS versions:
* "Visual Studio 10" -> "Visual Studio 10 2010"
* "Visual Studio 11" -> "Visual Studio 11 2012"
* "Visual Studio 12" -> "Visual Studio 12 2013"
This clarifies which generator goes with each Visual Studio version.
The old names are recognized for compatibility.
* The "CMAKE_<LANG>_COMPILER_ID" value for Apple-provided Clang is
now "AppleClang". It must be distinct from upstream Clang because
the version numbers differ. See policy "CMP0025".
* The "CMAKE_<LANG>_COMPILER_ID" value for "qcc" on QNX is now
"QCC". It must be distinct from "GNU" because the command-line
options differ. See policy "CMP0047".
* On 64-bit OS X the "CMAKE_HOST_SYSTEM_PROCESSOR" value is now
correctly detected as "x86_64" instead of "i386".
* On OS X, CMake learned to enable behavior specified by the
"MACOSX_RPATH" target property by default. This activates use of
"@rpath" for runtime shared library searches. See policy "CMP0042".
* The "build_command()" command now returns a "cmake(1)" "--build"
command line instead of a direct invocation of the native build
tool. When using "Visual Studio" generators, CMake and CTest no
longer require "CMAKE_MAKE_PROGRAM" to be located up front.
Selection of the proper msbuild or devenv tool is now performed as
late as possible when the solution (".sln") file is available so it
can depend on project content.
* The "cmake(1)" "--build" command now shares its own stdout and
stderr pipes with the native build tool by default. The "--use-
stderr" option that once activated this is now ignored.
* The "$<C_COMPILER_ID:...>" and "$<CXX_COMPILER_ID:...>" "generator
expressions" used to perform case-insensitive comparison but have
now been corrected to perform case-sensitive comparison. See policy
"CMP0044".
* The builtin "edit_cache" target will no longer select "ccmake(1)"
by default when no interactive terminal will be available (e.g. with
"Ninja" or an IDE generator). Instead "cmake-gui(1)" will be
preferred if available.
* The "ExternalProject" download step learned to re-attempt download
in certain cases to be more robust to temporary network failure.
* The "FeatureSummary" no longer lists transitive dependencies since
they were not directly requested by the current project.
* The "cmake-mode.el" major Emacs editing mode has been cleaned up
and enhanced in several ways.
* Include directories specified in the
"INTERFACE_INCLUDE_DIRECTORIES" of *Imported Targets* are treated as
"SYSTEM" includes by default when handled as *usage requirements*.
