[ANNOUNCE] CMake 3.16.0-rc2 is ready for testing

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[ANNOUNCE] CMake 3.16.0-rc2 is ready for testing

CMake mailing list
I am proud to announce the second CMake 3.16 release candidate.
  https://cmake.org/download/

Documentation is available at:
  https://cmake.org/cmake/help/v3.16

Release notes appear below and are also published at
  https://cmake.org/cmake/help/v3.16/release/3.16.html

Some of the more significant changes in CMake 3.16 are:

* CMake learned to support the Objective C ("OBJC") and Objective
  C++ ("OBJCXX") languages.  They may be enabled via the "project()"
  and "enable_language()" commands.  When "OBJC" or "OBJCXX" is
  enabled, source files with the ".m" or ".mm", respectively, will be
  compiled as Objective C or C++.  Otherwise they will be treated as
  plain C++ sources as they were before.

* The "target_precompile_headers()" command was added to specify a
  list of headers to precompile for faster compilation times.

* The "UNITY_BUILD" target property was added to tell generators to
  batch include source files for faster compilation times.

* The "find_file()", "find_library()", "find_path()",
  "find_package()", and "find_program()" commands have learned to
  check the following variables to control searching

  * "CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH" - Controls the searching
    the cmake-specific environment variables.

  * "CMAKE_FIND_USE_CMAKE_PATH" - Controls the searching the cmake-
    specific cache variables.

  * "CMAKE_FIND_USE_CMAKE_SYSTEM_PATH" - Controls the searching
    cmake platform specific variables.

  * "CMAKE_FIND_USE_PACKAGE_ROOT_PATH" - Controls the searching of
    "<PackageName>_ROOT" variables.

  * "CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH" - Controls the
    searching the standard system environment variables.

* The "file()" command learned a new sub-command,
  "GET_RUNTIME_DEPENDENCIES", which allows you to recursively get the
  list of libraries linked by an executable or library. This sub-
  command is intended as a replacement for "GetPrerequisites".

* "ctest(1)" now has the ability to serialize tests based on
  hardware requirements for each test. See Hardware Allocation for
  details.

* On AIX, executables using the "ENABLE_EXPORTS" target property now
  produce a linker import file with a ".imp" extension in addition to
  the executable file.  Plugins (created via "add_library()" with the
  "MODULE" option) that use "target_link_libraries()" to link to the
  executable for its symbols are now linked using the import file. The
  "install(TARGETS)" command now installs the import file as an
  "ARCHIVE" artifact.

* On AIX, runtime linking is no longer enabled by default.  CMake
  provides the linker enough information to resolve all symbols up
  front. One may manually enable runtime linking for shared libraries
  and/or loadable modules by adding "-Wl,-G" to their link flags (e.g.
  in the "CMAKE_SHARED_LINKER_FLAGS" or "CMAKE_MODULE_LINKER_FLAGS"
  variable). One may manually enable runtime linking for executables
  by adding "-Wl,-brtl" to their link flags (e.g. in the
  "CMAKE_EXE_LINKER_FLAGS" variable).

* "cmake(1)" "-E" now supports "true" and "false" commands, which do
  nothing while returning exit codes of 0 and 1, respectively.

* "cmake(1)" gained a "--trace-redirect=<file>" command line option
  that can be used to redirect "--trace" output to a file instead of
  "stderr".

* The "cmake(1)" "--loglevel" command line option has been renamed
  to "--log-level" to make it consistent with the naming of other
  command line options.  The "--loglevel" option is still supported to
  preserve backward compatibility.

* The "CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY" variable has been
  deprecated.  Use the "CMAKE_FIND_USE_PACKAGE_REGISTRY" variable
  instead.

* The "GetPrerequisites" module has been deprecated, as it has been
  superceded by "file(GET_RUNTIME_DEPENDENCIES)".


CMake 3.16 Release Notes
************************

Changes made since CMake 3.15 include the following.


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


Languages
---------

* CMake learned to support the Objective C ("OBJC") and Objective
  C++ ("OBJCXX") languages.  They may be enabled via the "project()"
  and "enable_language()" commands.  When "OBJC" or "OBJCXX" is
  enabled, source files with the ".m" or ".mm", respectively, will be
  compiled as Objective C or C++.  Otherwise they will be treated as
  plain C++ sources as they were before.


Compilers
---------

* The "Clang" compiler is now supported on "Solaris".


Platforms
---------

* On AIX, executables using the "ENABLE_EXPORTS" target property now
  produce a linker import file with a ".imp" extension in addition to
  the executable file.  Plugins (created via "add_library()" with the
  "MODULE" option) that use "target_link_libraries()" to link to the
  executable for its symbols are now linked using the import file. The
  "install(TARGETS)" command now installs the import file as an
  "ARCHIVE" artifact.

* On AIX, runtime linking is no longer enabled by default.  CMake
  provides the linker enough information to resolve all symbols up
  front. One may manually enable runtime linking for shared libraries
  and/or loadable modules by adding "-Wl,-G" to their link flags (e.g.
  in the "CMAKE_SHARED_LINKER_FLAGS" or "CMAKE_MODULE_LINKER_FLAGS"
  variable). One may manually enable runtime linking for executables
  by adding "-Wl,-brtl" to their link flags (e.g. in the
  "CMAKE_EXE_LINKER_FLAGS" variable).


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

* "cmake(1)" "-E" now supports "true" and "false" commands, which do
  nothing while returning exit codes of 0 and 1, respectively.

* "cmake(1)" gained a "--trace-redirect=<file>" command line option
  that can be used to redirect "--trace" output to a file instead of
  "stderr".

* The "cmake(1)" "--loglevel" command line option has been renamed
  to "--log-level" to make it consistent with the naming of other
  command line options.  The "--loglevel" option is still supported to
  preserve backward compatibility.


Commands
--------

* The "add_test()" command learned the option "COMMAND_EXPAND_LISTS"
  which causes lists in the "COMMAND" argument to be expanded,
  including lists created by generator expressions.

* The "file()" command learned a new sub-command,
  "GET_RUNTIME_DEPENDENCIES", which allows you to recursively get the
  list of libraries linked by an executable or library. This sub-
  command is intended as a replacement for "GetPrerequisites".

* The "find_file()", "find_library()", "find_path()",
  "find_package()", and "find_program()" commands have learned to
  check the following variables to control searching

  * "CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH" - Controls the searching
    the cmake-specific environment variables.

  * "CMAKE_FIND_USE_CMAKE_PATH" - Controls the searching the cmake-
    specific cache variables.

  * "CMAKE_FIND_USE_CMAKE_SYSTEM_PATH" - Controls the searching
    cmake platform specific variables.

  * "CMAKE_FIND_USE_PACKAGE_ROOT_PATH" - Controls the searching of
    "<PackageName>_ROOT" variables.

  * "CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH" - Controls the
    searching the standard system environment variables.

* The "find_package()" command has learned to check the following
  variables to control searching

  * "CMAKE_FIND_USE_PACKAGE_REGISTRY" - Controls the searching the
    cmake user registry.

* The "message()" command learned indentation control with the new
  "CMAKE_MESSAGE_INDENT" variable.

* The "target_precompile_headers()" command was added to specify a
  list of headers to precompile for faster compilation times.


Variables
---------

* The "CMAKE_CUDA_RESOLVE_DEVICE_SYMBOLS" variable has been
  introduced to optionally initialize the
  "CUDA_RESOLVE_DEVICE_SYMBOLS" target property.

* The "CMAKE_ECLIPSE_RESOURCE_ENCODING" variable was added to
  specify the resource encoding for the the "Eclipse CDT4" extra
  generator.


Properties
----------

* The "BUILD_RPATH" and "INSTALL_RPATH" target properties now
  support "generator expressions".

* The "INSTALL_REMOVE_ENVIRONMENT_RPATH" target property was added
  to remove compiler-defined "RPATH" entries from a target. This
  property is initialized by the
  "CMAKE_INSTALL_REMOVE_ENVIRONMENT_RPATH" variable.

* The "PRECOMPILE_HEADERS" target property was added to specify a
  list of headers to precompile for faster compilation times. Set it
  using the "target_precompile_headers()" command.

* The "UNITY_BUILD" target property was added to tell generators to
  batch include source files for faster compilation times.

* The "VS_CONFIGURATION_TYPE" target property now supports
  "generator expressions".

* The "VS_DPI_AWARE" target property was added to tell Visual Studio
  Generators to set the "EnableDpiAwareness" property in ".vcxproj"
  files.

* The "XCODE_SCHEME_DEBUG_DOCUMENT_VERSIONING" target property was
  added to tell the "Xcode" generator to set the value of the "Allow
  debugging when using document Versions Browser" schema option.


Modules
-------

* The "FindDoxygen" module "doxygen_add_docs()" command gained a new
  "USE_STAMP_FILE" option.  When this option present, the custom
  target created by the command will only re-run Doxygen if any of the
  source files have changed since the last successful run.

* The "FindGnuTLS" module now provides an imported target.

* The "FindPackageHandleStandardArgs" module
  "find_package_handle_standard_args()" command gained a new
  "REASON_FAILURE_MESSAGE" option to specify a message giving the
  reason for the failure.

* The "FindPkgConfig" module "pkg_search_module()" macro now defines
  a "<prefix>_MODULE_NAME" result variable containing the first
  matching module name.

* The "FindPython3" and "FindPython" modules gained options to
  control which "ABIs" will be searched.

* The "FindPython3", "FindPython2", and "FindPython" modules now
  support direct specification of artifacts via cache entries.


Autogen
-------

* When using "AUTOMOC", CMake now generates the "-p" path prefix
  option for "moc".  This ensures that "moc" output files are
  identical on different build setups (given, that the headers
  compiled by "moc" are in an "include directory"). Also it ensures
  that "moc" output files will compile correctly when the source
  and/or build directory is a symbolic link.

  The "moc" path prefix generation behavior can be configured by
  setting the new "CMAKE_AUTOMOC_PATH_PREFIX" variable and/or
  "AUTOMOC_PATH_PREFIX" target property.


CTest
-----

* "ctest(1)" now has the ability to serialize tests based on
  hardware requirements for each test. See Hardware Allocation for
  details.

* A new test property, "SKIP_REGULAR_EXPRESSION", has been added.
  This property is similar to "FAIL_REGULAR_EXPRESSION" and
  "PASS_REGULAR_EXPRESSION", but with the same meaning as
  "SKIP_RETURN_CODE". This is useful, for example, in cases where the
  user has no control over the return code of the test. For example,
  in Catch2, the return value is the number of assertion failed,
  therefore it is impossible to use it for "SKIP_RETURN_CODE".


CPack
-----

* CPack variable "CPACK_INSTALL_CMAKE_CONFIGURATIONS" was added to
  control what configurations are to be packaged for multi-
  configuration CMake generators.

* The "CPack DEB Generator" is now able to format generic text
  (usually used as the description for multiple CPack generators)
  according to the Debian Policy Manual.  See the
  "CPACK_PACKAGE_DESCRIPTION_FILE" and
  "CPACK_DEBIAN_<COMPONENT>_DESCRIPTION" variables.

* The "CPack Archive Generator" learned to generate ".tar.zst"
  packages with Zstandard compression.


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

* An explicit deprecation diagnostic was added for policy "CMP0067"
  ("CMP0066" and below were already deprecated). The "cmake-
  policies(7)" manual explains that the OLD behaviors of all policies
  are deprecated and that projects should port to the NEW behaviors.

* The "CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY" variable has been
  deprecated.  Use the "CMAKE_FIND_USE_PACKAGE_REGISTRY" variable
  instead.

* The "GetPrerequisites" module has been deprecated, as it has been
  superceded by "file(GET_RUNTIME_DEPENDENCIES)".

* The "CPACK_INSTALL_SCRIPT" variable has been deprecated in favor
  of the new, more accurately named "CPACK_INSTALL_SCRIPTS" variable.


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

* The "cmake(1)" "-C <initial-cache>" option now evaluates the
  initial cache script with "CMAKE_SOURCE_DIR" and "CMAKE_BINARY_DIR"
  set to the top-level source and build trees.

* The "cmake(1)" "-E remove_directory" command-line tool, when given
  the path to a symlink to a directory, now removes just the symlink.
  It no longer removes content of the linked directory.

* The "ctest(1)"  "--build-makeprogram" command-line option now
  specifies the make program used when configuring a project with the
  "Ninja" generator or the Makefile Generators.

* The "ExternalProject" module "ExternalProject_Add()" command has
  been updated so that "GIT_SUBMODULES """ initializes no submodules.
  See policy "CMP0097".

* The "FindGTest" module has been updated to recognize MSVC build
  trees generated by GTest 1.8.1.

* The "project()" command no longer strips leading zeros in version
  components.  See policy "CMP0096".

* The Qt Compressed Help file is now named "CMake.qch", which no
  longer contains the release version in the file name.  When CMake is
  upgraded in-place, the name and location of this file will remain
  constant. Tools such as IDEs, help viewers, etc. should now be able
  to refer to this file at a fixed location that remains valid across
  CMake upgrades.

* "RPATH" entries are properly escaped in the generated CMake
  scripts used for installation.  See policy "CMP0095".

* When using "CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS" on Windows the auto-
  generated exports are now updated only when the object files
  providing the symbols are updated.

----------------------------------------------------------------------------
Changes made since CMake 3.16.0-rc1:

Ben Boeckel (2):
  FindPostgreSQL: support version 12
  FindPostgreSQL: support macports installation scheme

Brad King (17):
  Intel: Fix default C++ dialect detection on Windows
  Tests: Update CompileFeatures test for Intel 19 with VS 2015
  Help: Document CMAKE_UNITY_BUILD in 3.16 release notes
  Help: Improve UNITY_BUILD documentation formatting
  Help: Extend documentation of CMAKE_UNITY_BUILD variable
  Help: Document CMAKE_UNITY_BUILD/CMAKE_EXPORT_COMPILE_COMMANDS limitation
  VS: Add toolset v142 CSharp flag table
  IRSL: Prefer MSVC runtime libraries from newest toolset first
  IRSL: Install vcruntime140_1.dll if available
  CMakeVersion: Prefer Git information provided by 'git archive' exports
  Help: Clarify documentation of CMAKE_STATIC_LINKER_FLAGS
  CMakeFindBinUtils: Remove unnecessary variable unset calls
  PCH: Document and test COMPILE_LANGUAGE genex for per-language header
  install,export: Do not treat language names as target names
  cmMakefileTargetGenerator: Inline WriteObjectBuildFile in only call site
  PCH: Fix Makefile dependencies to rebuild PCH on header changes
  CMake 3.16.0-rc2

Cristian Adam (1):
  Objective-C: Do not treat Objective-C files as C++ files

Konstantin Pyzhov (1):
  FindOpenMP: Add support for HIP clang device pass

Kyle Edwards (1):
  CMakeVersion: Add option to disable Git suffix

Manuel Herrmann (1):
  FindCurses: use tinfow when wide support is requested

Micael Borgefeldt (2):
  IAR: Fix v850 assembler support file extensions
  IAR: Add 8051 support

Peter Waller (1):
  cmake: Fix relative path regression in -C

Saleem Abdulrasool (1):
  try_compile: support Swift for cross-compilation

Tom Lankhorst (1):
  Help: Fix typos and style in add_link_options documentation

Willem Deconinck (2):
  FindHDF5: Cray HDF5 Fortran module filename is usually capitalized
  FindHDF5: Append hdf5 to hdf5_hl to avoid undefined references
--

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