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29 lines
1.2 KiB
29 lines
1.2 KiB
CMP0155
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.. versionadded:: 3.28
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C++ sources in targets with at least C++20 are scanned for imports
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when supported.
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CMake 3.27 and below assume that C++ sources do not ``import`` modules.
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CMake 3.28 and above prefer to assume that C++ sources in targets using C++20
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or higher might ``import`` modules, and must be scanned before compiling,
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unless explicitly disabled. This policy provides compatibility for projects
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that use C++20 or higher, without modules, that have not been updated to turn
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off scanning, e.g., via the :variable:`CMAKE_CXX_SCAN_FOR_MODULES` variable.
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See the :manual:`cmake-cxxmodules(7)` manual for more details on C++ module
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support.
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The ``OLD`` behavior for this policy is to assume that C++ 20 and newer
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sources do not import modules. The ``NEW`` behavior for this policy is to
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assume that C++ 20 and newer files may import modules if the compiler
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understands how to scan for their dependencies, and need to be scanned.
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This policy was introduced in CMake version 3.28. Use the
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:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.
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Unlike many policies, CMake version |release| does *not* warn
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when this policy is not set and simply uses ``OLD`` behavior.
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.. include:: DEPRECATED.txt
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