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459 lines
21 KiB
459 lines
21 KiB
.. cmake-manual-description: CMake Policies Reference
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cmake-policies(7)
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*****************
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.. only:: html
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.. contents::
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Introduction
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============
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Policies in CMake are used to preserve backward compatible behavior
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across multiple releases. When a new policy is introduced, newer CMake
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versions will begin to warn about the backward compatible behavior. It
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is possible to disable the warning by explicitly requesting the OLD, or
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backward compatible behavior using the :command:`cmake_policy` command.
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It is also possible to request ``NEW``, or non-backward compatible behavior
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for a policy, also avoiding the warning. Each policy can also be set to
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either ``NEW`` or ``OLD`` behavior explicitly on the command line with the
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:variable:`CMAKE_POLICY_DEFAULT_CMP<NNNN>` variable.
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A policy is a deprecation mechanism and not a reliable feature toggle.
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A policy should almost never be set to ``OLD``, except to silence warnings
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in an otherwise frozen or stable codebase, or temporarily as part of a
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larger migration path. The ``OLD`` behavior of each policy is undesirable
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and will be replaced with an error condition in a future release.
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The :command:`cmake_minimum_required` command does more than report an
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error if a too-old version of CMake is used to build a project. It
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also sets all policies introduced in that CMake version or earlier to
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``NEW`` behavior. To manage policies without increasing the minimum required
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CMake version, the :command:`if(POLICY)` command may be used:
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.. code-block:: cmake
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if(POLICY CMP0990)
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cmake_policy(SET CMP0990 NEW)
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endif()
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This has the effect of using the ``NEW`` behavior with newer CMake releases which
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users may be using and not issuing a compatibility warning.
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The setting of a policy is confined in some cases to not propagate to the
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parent scope. For example, if the files read by the :command:`include` command
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or the :command:`find_package` command contain a use of :command:`cmake_policy`,
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that policy setting will not affect the caller by default. Both commands accept
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an optional ``NO_POLICY_SCOPE`` keyword to control this behavior.
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The :variable:`CMAKE_MINIMUM_REQUIRED_VERSION` variable may also be used
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to determine whether to report an error on use of deprecated macros or
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functions.
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Policies Introduced by CMake 3.31
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0180: project() always sets <PROJECT-NAME>_* as normal variables. </policy/CMP0180>
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CMP0179: De-duplication of static libraries on link lines keeps first occurrence. </policy/CMP0179>
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CMP0178: Test command lines preserve empty arguments. </policy/CMP0178>
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CMP0177: install() DESTINATION paths are normalized. </policy/CMP0177>
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CMP0176: execute_process() ENCODING is UTF-8 by default. </policy/CMP0176>
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CMP0175: add_custom_command() rejects invalid arguments. </policy/CMP0175>
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CMP0174: cmake_parse_arguments(PARSE_ARGV) defines a variable for an empty string after a single-value keyword. </policy/CMP0174>
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CMP0173: The CMakeFindFrameworks module is removed. </policy/CMP0173>
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CMP0172: The CPack module enables per-machine installation by default in the CPack WIX Generator. </policy/CMP0172>
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CMP0171: 'codegen' is a reserved target name. </policy/CMP0171>
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Policies Introduced by CMake 3.30
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0170: FETCHCONTENT_FULLY_DISCONNECTED requirements are enforced. </policy/CMP0170>
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CMP0169: FetchContent_Populate(depName) single-argument signature is deprecated. </policy/CMP0169>
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CMP0168: FetchContent implements steps directly instead of through a sub-build. </policy/CMP0168>
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CMP0167: The FindBoost module is removed. </policy/CMP0167>
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CMP0166: TARGET_PROPERTY evaluates link properties transitively over private dependencies of static libraries. </policy/CMP0166>
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CMP0165: enable_language() must not be called before project(). </policy/CMP0165>
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CMP0164: add_library() rejects SHARED libraries when not supported by the platform. </policy/CMP0164>
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CMP0163: The GENERATED source file property is now visible in all directories. </policy/CMP0163>
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CMP0162: Visual Studio generators add UseDebugLibraries indicators by default. </policy/CMP0162>
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Policies Introduced by CMake 3.29
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0161: CPACK_PRODUCTBUILD_DOMAINS defaults to true. </policy/CMP0161>
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CMP0160: More read-only target properties now error when trying to set them. </policy/CMP0160>
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CMP0159: file(STRINGS) with REGEX updates CMAKE_MATCH_<n>. </policy/CMP0159>
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CMP0158: add_test() honors CMAKE_CROSSCOMPILING_EMULATOR only when cross-compiling. </policy/CMP0158>
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CMP0157: Swift compilation mode is selected by an abstraction. </policy/CMP0157>
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CMP0156: De-duplicate libraries on link lines based on linker capabilities. </policy/CMP0156>
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Policies Introduced by CMake 3.28
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0155: C++ sources in targets with at least C++20 are scanned for imports when supported. </policy/CMP0155>
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CMP0154: Generated files are private by default in targets using file sets. </policy/CMP0154>
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CMP0153: The exec_program command should not be called. </policy/CMP0153>
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CMP0152: file(REAL_PATH) resolves symlinks before collapsing ../ components. </policy/CMP0152>
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Policies Introduced by CMake 3.27
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0151: AUTOMOC include directory is a system include directory by default. </policy/CMP0151>
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CMP0150: ExternalProject_Add and FetchContent_Declare treat relative git repository paths as being relative to parent project's remote. </policy/CMP0150>
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CMP0149: Visual Studio generators select latest Windows SDK by default. </policy/CMP0149>
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CMP0148: The FindPythonInterp and FindPythonLibs modules are removed. </policy/CMP0148>
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CMP0147: Visual Studio generators build custom commands in parallel. </policy/CMP0147>
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CMP0146: The FindCUDA module is removed. </policy/CMP0146>
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CMP0145: The Dart and FindDart modules are removed. </policy/CMP0145>
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CMP0144: find_package uses upper-case PACKAGENAME_ROOT variables. </policy/CMP0144>
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Policies Introduced by CMake 3.26
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0143: USE_FOLDERS global property is treated as ON by default. </policy/CMP0143>
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Policies Introduced by CMake 3.25
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0142: The Xcode generator does not append per-config suffixes to library search paths. </policy/CMP0142>
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CMP0141: MSVC debug information format flags are selected by an abstraction. </policy/CMP0141>
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CMP0140: The return() command checks its arguments. </policy/CMP0140>
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Policies Introduced by CMake 3.24
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0139: The if() command supports path comparisons using PATH_EQUAL operator. </policy/CMP0139>
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CMP0138: CheckIPOSupported uses flags from calling project. </policy/CMP0138>
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CMP0137: try_compile() passes platform variables in project mode. </policy/CMP0137>
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CMP0136: Watcom runtime library flags are selected by an abstraction. </policy/CMP0136>
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CMP0135: ExternalProject and FetchContent ignore timestamps in archives by default for the URL download method. </policy/CMP0135>
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CMP0134: Fallback to "HOST" Windows registry view when "TARGET" view is not usable. </policy/CMP0134>
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CMP0133: The CPack module disables SLA by default in the CPack DragNDrop Generator. </policy/CMP0133>
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CMP0132: Do not set compiler environment variables on first run. </policy/CMP0132>
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CMP0131: LINK_LIBRARIES supports the LINK_ONLY generator expression. </policy/CMP0131>
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CMP0130: while() diagnoses condition evaluation errors. </policy/CMP0130>
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Policies Introduced by CMake 3.23
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0129: Compiler id for MCST LCC compilers is now LCC, not GNU. </policy/CMP0129>
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Policies Introduced by CMake 3.22
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0128: Selection of language standard and extension flags improved. </policy/CMP0128>
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CMP0127: cmake_dependent_option() supports full Condition Syntax. </policy/CMP0127>
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Policies Introduced by CMake 3.21
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0126: set(CACHE) does not remove a normal variable of the same name. </policy/CMP0126>
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CMP0125: find_(path|file|library|program) have consistent behavior for cache variables. </policy/CMP0125>
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CMP0124: foreach() loop variables are only available in the loop scope. </policy/CMP0124>
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CMP0123: ARMClang cpu/arch compile and link flags must be set explicitly. </policy/CMP0123>
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CMP0122: UseSWIG use standard library name conventions for csharp language. </policy/CMP0122>
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CMP0121: The list command detects invalid indices. </policy/CMP0121>
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Policies Introduced by CMake 3.20
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0120: The WriteCompilerDetectionHeader module is removed. </policy/CMP0120>
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CMP0119: LANGUAGE source file property explicitly compiles as language. </policy/CMP0119>
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CMP0118: GENERATED sources may be used across directories without manual marking. </policy/CMP0118>
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CMP0117: MSVC RTTI flag /GR is not added to CMAKE_CXX_FLAGS by default. </policy/CMP0117>
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CMP0116: Ninja generators transform DEPFILEs from add_custom_command(). </policy/CMP0116>
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CMP0115: Source file extensions must be explicit. </policy/CMP0115>
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Policies Introduced by CMake 3.19
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0114: ExternalProject step targets fully adopt their steps. </policy/CMP0114>
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CMP0113: Makefile generators do not repeat custom commands from target dependencies. </policy/CMP0113>
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CMP0112: Target file component generator expressions do not add target dependencies. </policy/CMP0112>
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CMP0111: An imported target missing its location property fails during generation. </policy/CMP0111>
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CMP0110: add_test() supports arbitrary characters in test names. </policy/CMP0110>
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CMP0109: find_program() requires permission to execute but not to read. </policy/CMP0109>
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Policies Introduced by CMake 3.18
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0108: A target cannot link to itself through an alias. </policy/CMP0108>
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CMP0107: An ALIAS target cannot overwrite another target. </policy/CMP0107>
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CMP0106: The Documentation module is removed. </policy/CMP0106>
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CMP0105: Device link step uses the link options. </policy/CMP0105>
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CMP0104: CMAKE_CUDA_ARCHITECTURES now detected for NVCC, empty CUDA_ARCHITECTURES not allowed. </policy/CMP0104>
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CMP0103: Multiple export() with same FILE without APPEND is not allowed. </policy/CMP0103>
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Policies Introduced by CMake 3.17
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0102: mark_as_advanced() does nothing if a cache entry does not exist. </policy/CMP0102>
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CMP0101: target_compile_options honors BEFORE keyword in all scopes. </policy/CMP0101>
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CMP0100: Let AUTOMOC and AUTOUIC process .hh header files. </policy/CMP0100>
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CMP0099: Link properties are transitive over private dependencies of static libraries. </policy/CMP0099>
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CMP0098: FindFLEX runs flex in CMAKE_CURRENT_BINARY_DIR when executing. </policy/CMP0098>
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Policies Introduced by CMake 3.16
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0097: ExternalProject_Add with GIT_SUBMODULES "" initializes no submodules. </policy/CMP0097>
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CMP0096: project() preserves leading zeros in version components. </policy/CMP0096>
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CMP0095: RPATH entries are properly escaped in the intermediary CMake install script. </policy/CMP0095>
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Policies Introduced by CMake 3.15
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0094: FindPython3, FindPython2 and FindPython use LOCATION for lookup strategy. </policy/CMP0094>
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CMP0093: FindBoost reports Boost_VERSION in x.y.z format. </policy/CMP0093>
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CMP0092: MSVC warning flags are not in CMAKE_{C,CXX}_FLAGS by default. </policy/CMP0092>
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CMP0091: MSVC runtime library flags are selected by an abstraction. </policy/CMP0091>
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CMP0090: export(PACKAGE) does not populate package registry by default. </policy/CMP0090>
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CMP0089: Compiler id for IBM Clang-based XL compilers is now XLClang. </policy/CMP0089>
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Policies Introduced by CMake 3.14
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0088: FindBISON runs bison in CMAKE_CURRENT_BINARY_DIR when executing. </policy/CMP0088>
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CMP0087: install(SCRIPT | CODE) supports generator expressions. </policy/CMP0087>
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CMP0086: UseSWIG honors SWIG_MODULE_NAME via -module flag. </policy/CMP0086>
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CMP0085: IN_LIST generator expression handles empty list items. </policy/CMP0085>
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CMP0084: The FindQt module does not exist for find_package(). </policy/CMP0084>
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CMP0083: Add PIE options when linking executable. </policy/CMP0083>
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CMP0082: Install rules from add_subdirectory() are interleaved with those in caller. </policy/CMP0082>
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Policies Introduced by CMake 3.13
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0081: Relative paths not allowed in LINK_DIRECTORIES target property. </policy/CMP0081>
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CMP0080: BundleUtilities cannot be included at configure time. </policy/CMP0080>
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CMP0079: target_link_libraries allows use with targets in other directories. </policy/CMP0079>
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CMP0078: UseSWIG generates standard target names. </policy/CMP0078>
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CMP0077: option() honors normal variables. </policy/CMP0077>
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CMP0076: target_sources() command converts relative paths to absolute. </policy/CMP0076>
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Policies Introduced by CMake 3.12
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0075: Include file check macros honor CMAKE_REQUIRED_LIBRARIES. </policy/CMP0075>
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CMP0074: find_package uses PackageName_ROOT variables. </policy/CMP0074>
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CMP0073: Do not produce legacy _LIB_DEPENDS cache entries. </policy/CMP0073>
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Policies Introduced by CMake 3.11
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0072: FindOpenGL prefers GLVND by default when available. </policy/CMP0072>
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Policies Introduced by CMake 3.10
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=================================
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.. toctree::
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:maxdepth: 1
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CMP0071: Let AUTOMOC and AUTOUIC process GENERATED files. </policy/CMP0071>
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CMP0070: Define file(GENERATE) behavior for relative paths. </policy/CMP0070>
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Policies Introduced by CMake 3.9
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================================
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.. toctree::
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:maxdepth: 1
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CMP0069: INTERPROCEDURAL_OPTIMIZATION is enforced when enabled. </policy/CMP0069>
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CMP0068: RPATH settings on macOS do not affect install_name. </policy/CMP0068>
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Policies Introduced by CMake 3.8
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================================
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.. toctree::
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:maxdepth: 1
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CMP0067: Honor language standard in try_compile() source-file signature. </policy/CMP0067>
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Policies Introduced by CMake 3.7
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================================
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.. toctree::
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:maxdepth: 1
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CMP0066: Honor per-config flags in try_compile() source-file signature. </policy/CMP0066>
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Policies Introduced by CMake 3.4
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================================
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.. toctree::
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:maxdepth: 1
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CMP0065: Do not add flags to export symbols from executables without the ENABLE_EXPORTS target property. </policy/CMP0065>
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CMP0064: Support new TEST if() operator. </policy/CMP0064>
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Policies Introduced by CMake 3.3
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================================
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.. toctree::
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:maxdepth: 1
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CMP0063: Honor visibility properties for all target types. </policy/CMP0063>
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CMP0062: Disallow install() of export() result. </policy/CMP0062>
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CMP0061: CTest does not by default tell make to ignore errors (-i). </policy/CMP0061>
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CMP0060: Link libraries by full path even in implicit directories. </policy/CMP0060>
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CMP0059: Do not treat DEFINITIONS as a built-in directory property. </policy/CMP0059>
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CMP0058: Ninja requires custom command byproducts to be explicit. </policy/CMP0058>
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CMP0057: Support new IN_LIST if() operator. </policy/CMP0057>
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Policies Introduced by CMake 3.2
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================================
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.. toctree::
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:maxdepth: 1
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CMP0056: Honor link flags in try_compile() source-file signature. </policy/CMP0056>
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CMP0055: Strict checking for break() command. </policy/CMP0055>
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Policies Introduced by CMake 3.1
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================================
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.. toctree::
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:maxdepth: 1
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CMP0054: Only interpret if() arguments as variables or keywords when unquoted. </policy/CMP0054>
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CMP0053: Simplify variable reference and escape sequence evaluation. </policy/CMP0053>
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CMP0052: Reject source and build dirs in installed INTERFACE_INCLUDE_DIRECTORIES. </policy/CMP0052>
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CMP0051: List TARGET_OBJECTS in SOURCES target property. </policy/CMP0051>
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Policies Introduced by CMake 3.0
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================================
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.. toctree::
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:maxdepth: 1
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CMP0050: Disallow add_custom_command SOURCE signatures. </policy/CMP0050>
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CMP0049: Do not expand variables in target source entries. </policy/CMP0049>
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CMP0048: project() command manages VERSION variables. </policy/CMP0048>
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CMP0047: Use QCC compiler id for the qcc drivers on QNX. </policy/CMP0047>
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CMP0046: Error on non-existent dependency in add_dependencies. </policy/CMP0046>
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CMP0045: Error on non-existent target in get_target_property. </policy/CMP0045>
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CMP0044: Case sensitive Lang_COMPILER_ID generator expressions. </policy/CMP0044>
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CMP0043: Ignore COMPILE_DEFINITIONS_Config properties. </policy/CMP0043>
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CMP0042: MACOSX_RPATH is enabled by default. </policy/CMP0042>
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CMP0041: Error on relative include with generator expression. </policy/CMP0041>
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CMP0040: The target in the TARGET signature of add_custom_command() must exist. </policy/CMP0040>
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CMP0039: Utility targets may not have link dependencies. </policy/CMP0039>
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CMP0038: Targets may not link directly to themselves. </policy/CMP0038>
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CMP0037: Target names should not be reserved and should match a validity pattern. </policy/CMP0037>
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CMP0036: The build_name command should not be called. </policy/CMP0036>
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CMP0035: The variable_requires command should not be called. </policy/CMP0035>
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CMP0034: The utility_source command should not be called. </policy/CMP0034>
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CMP0033: The export_library_dependencies command should not be called. </policy/CMP0033>
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CMP0032: The output_required_files command should not be called. </policy/CMP0032>
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CMP0031: The load_command command should not be called. </policy/CMP0031>
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CMP0030: The use_mangled_mesa command should not be called. </policy/CMP0030>
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CMP0029: The subdir_depends command should not be called. </policy/CMP0029>
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CMP0028: Double colon in target name means ALIAS or IMPORTED target. </policy/CMP0028>
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CMP0027: Conditionally linked imported targets with missing include directories. </policy/CMP0027>
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CMP0026: Disallow use of the LOCATION target property. </policy/CMP0026>
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CMP0025: Compiler id for Apple Clang is now AppleClang. </policy/CMP0025>
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CMP0024: Disallow include export result. </policy/CMP0024>
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Policies Introduced by CMake 2.8
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================================
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.. toctree::
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:maxdepth: 1
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CMP0023: Plain and keyword target_link_libraries signatures cannot be mixed. </policy/CMP0023>
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CMP0022: INTERFACE_LINK_LIBRARIES defines the link interface. </policy/CMP0022>
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CMP0021: Fatal error on relative paths in INCLUDE_DIRECTORIES target property. </policy/CMP0021>
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CMP0020: Automatically link Qt executables to qtmain target on Windows. </policy/CMP0020>
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CMP0019: Do not re-expand variables in include and link information. </policy/CMP0019>
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CMP0018: Ignore CMAKE_SHARED_LIBRARY_Lang_FLAGS variable. </policy/CMP0018>
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CMP0017: Prefer files from the CMake module directory when including from there. </policy/CMP0017>
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CMP0016: target_link_libraries() reports error if its only argument is not a target. </policy/CMP0016>
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CMP0015: link_directories() treats paths relative to the source dir. </policy/CMP0015>
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CMP0014: Input directories must have CMakeLists.txt. </policy/CMP0014>
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CMP0013: Duplicate binary directories are not allowed. </policy/CMP0013>
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CMP0012: if() recognizes numbers and boolean constants. </policy/CMP0012>
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Policies Introduced by CMake 2.6
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================================
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.. toctree::
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:maxdepth: 1
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CMP0011: Included scripts do automatic cmake_policy PUSH and POP. </policy/CMP0011>
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CMP0010: Bad variable reference syntax is an error. </policy/CMP0010>
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CMP0009: FILE GLOB_RECURSE calls should not follow symlinks by default. </policy/CMP0009>
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CMP0008: Libraries linked by full-path must have a valid library file name. </policy/CMP0008>
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CMP0007: list command no longer ignores empty elements. </policy/CMP0007>
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CMP0006: Installing MACOSX_BUNDLE targets requires a BUNDLE DESTINATION. </policy/CMP0006>
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CMP0005: Preprocessor definition values are now escaped automatically. </policy/CMP0005>
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CMP0004: Libraries linked may not have leading or trailing whitespace. </policy/CMP0004>
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CMP0003: Libraries linked via full path no longer produce linker search paths. </policy/CMP0003>
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CMP0002: Logical target names must be globally unique. </policy/CMP0002>
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CMP0001: CMAKE_BACKWARDS_COMPATIBILITY should no longer be used. </policy/CMP0001>
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CMP0000: A minimum required CMake version must be specified. </policy/CMP0000>
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