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95 lines
3.0 KiB
ReStructuredText
95 lines
3.0 KiB
ReStructuredText
CMP0069
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-------
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.. versionadded:: 3.9
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:prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` is enforced when enabled.
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CMake 3.9 and newer prefer to add IPO flags whenever the
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:prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` target property is enabled and
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produce an error if flags are not known to CMake for the current compiler.
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Since a given compiler may not support IPO flags in all environments in which
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it is used, it is now the project's responsibility to use the
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:module:`CheckIPOSupported` module to check for support before enabling the
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:prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` target property. This approach
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allows a project to conditionally activate IPO when supported. It also
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allows an end user to set the :variable:`CMAKE_INTERPROCEDURAL_OPTIMIZATION`
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variable in an environment known to support IPO even if the project does
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not enable the property.
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Since CMake 3.8 and lower only honored :prop_tgt:`INTERPROCEDURAL_OPTIMIZATION`
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for the Intel compiler on Linux, some projects may unconditionally enable the
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target property. Policy ``CMP0069`` provides compatibility with such projects.
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This policy takes effect whenever the IPO property is enabled. The ``OLD``
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behavior for this policy is to add IPO flags only for Intel compiler on Linux.
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The ``NEW`` behavior for this policy is to add IPO flags for the current
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compiler or produce an error if CMake does not know the flags.
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This policy was introduced in CMake version 3.9. CMake version
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|release| warns when the policy is not set and uses ``OLD`` behavior.
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Use the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW``
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explicitly.
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.. include:: DEPRECATED.txt
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Examples
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^^^^^^^^
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Behave like CMake 3.8 and do not apply any IPO flags except for Intel compiler
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on Linux:
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.. code-block:: cmake
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cmake_minimum_required(VERSION 3.8)
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project(foo)
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# ...
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set_property(TARGET ... PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
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Use the :module:`CheckIPOSupported` module to detect whether IPO is
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supported by the current compiler, environment, and CMake version.
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Produce a fatal error if support is not available:
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.. code-block:: cmake
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cmake_minimum_required(VERSION 3.9) # CMP0069 NEW
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project(foo)
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include(CheckIPOSupported)
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check_ipo_supported()
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# ...
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set_property(TARGET ... PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
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Apply IPO flags only if compiler supports it:
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.. code-block:: cmake
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cmake_minimum_required(VERSION 3.9) # CMP0069 NEW
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project(foo)
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include(CheckIPOSupported)
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# ...
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check_ipo_supported(RESULT result)
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if(result)
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set_property(TARGET ... PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
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endif()
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Apply IPO flags without any checks. This may lead to build errors if IPO
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is not supported by the compiler in the current environment. Produce an
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error if CMake does not know IPO flags for the current compiler:
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.. code-block:: cmake
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cmake_minimum_required(VERSION 3.9) # CMP0069 NEW
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project(foo)
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# ...
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set_property(TARGET ... PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
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