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70 lines
2.2 KiB
70 lines
2.2 KiB
5 years ago
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CMP0083
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-------
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To control generation of Position Independent Executable (``PIE``) or not, some
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flags are required at link time.
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CMake 3.13 and lower did not add these link flags when
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:prop_tgt:`POSITION_INDEPENDENT_CODE` is set.
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The ``OLD`` behavior for this policy is to not manage ``PIE`` link flags. The
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``NEW`` behavior is to add link flags if :prop_tgt:`POSITION_INDEPENDENT_CODE`
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is set:
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* Set to ``TRUE``: flags to produce a position independent executable are
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passed to the linker step. For example ``-pie`` for ``GCC``.
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* Set to ``FALSE``: flags not to produce a position independent executable are
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passed to the linker step. For example ``-no-pie`` for ``GCC``.
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* Not set: no flags are passed to the linker step.
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Since a given linker may not support ``PIE`` flags in all environments in
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which it is used, it is the project's responsibility to use the
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:module:`CheckPIESupported` module to check for support to ensure that the
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:prop_tgt:`POSITION_INDEPENDENT_CODE` target property for executables will be
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honored at link time.
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This policy was introduced in CMake version 3.14. Use the
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:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.
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Unlike most policies, CMake version |release| does not warn when this policy is
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not set and simply uses ``OLD`` behavior.
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.. Note::
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Android platform has a special handling of ``PIE`` so it is not required
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to use the :module:`CheckPIESupported` module to ensure flags are passed to
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the linker.
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.. include:: DEPRECATED.txt
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Examples
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^^^^^^^^
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Behave like CMake 3.13 and do not apply any ``PIE`` flags at link stage.
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.. code-block:: cmake
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cmake_minimum_required(VERSION 3.13)
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project(foo)
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# ...
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add_executable(foo ...)
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set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE)
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Use the :module:`CheckPIESupported` module to detect whether ``PIE`` is
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supported by the current linker and environment. Apply ``PIE`` flags only
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if the linker supports them.
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.. code-block:: cmake
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cmake_minimum_required(VERSION 3.14) # CMP0083 NEW
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project(foo)
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include(CheckPIESupported)
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check_pie_supported()
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# ...
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add_executable(foo ...)
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set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE)
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