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| -rw-r--r-- | Help/policy/CMP0137.rst | 29 |
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diff --git a/Help/policy/CMP0137.rst b/Help/policy/CMP0137.rst new file mode 100644 index 0000000000..2efb9060b0 --- /dev/null +++ b/Help/policy/CMP0137.rst @@ -0,0 +1,29 @@ +CMP0137 +------- + +.. versionadded:: 3.24 + +:command:`try_compile` passes platform variables in project mode. + +The :command:`try_compile` command :ref:`source file <Try Compiling Source +Files>` signature propagates CMake variables containing platform settings, +and those specified by the :variable:`CMAKE_TRY_COMPILE_PLATFORM_VARIABLES` +variable, into the generated test project. This helps the test project drive +the toolchain the same way the calling project will. In CMake 3.23 and below, +the :ref:`whole-project <Try Compiling Whole Projects>` signature does not +propagate platform variables automatically. CMake 3.24 and above prefer to +propagate platform variables in the :ref:`whole-project <Try Compiling Whole +Projects>` signature. This policy provides compatibility with projects that +have not been updated to expect the behavior. + +The ``OLD`` behavior for this policy is to not pass any additional variables to +the :ref:`whole-project <Try Compiling Whole Projects>` signature. +The ``NEW`` behavior for this policy is to pass the same variables that the +:ref:`source file <Try Compiling Source Files>` signature does. + +This policy was introduced in CMake version 3.24. Use the +:command:`cmake_policy` command to set this policy to ``OLD`` or ``NEW`` +explicitly. Unlike many policies, CMake version |release| does *not* warn +by default when this policy is not set and simply uses ``OLD`` behavior. + +.. include:: DEPRECATED.txt |