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CMP0049
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-------
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Do not expand variables in target source entries.
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CMake 2.8.12 and lower performed and extra layer of variable expansion
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when evaluating source file names:
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.. code-block:: cmake
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set(a_source foo.c)
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add_executable(foo \${a_source})
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This was undocumented behavior.
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The OLD behavior for this policy is to expand such variables when processing
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the target sources. The NEW behavior for this policy is to issue an error
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if such variables need to be expanded.
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This policy was introduced in CMake version 3.0.
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CMake version |release| warns when the policy is not set and uses
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OLD behavior. Use the cmake_policy command to set it to OLD or
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NEW explicitly.
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.. include:: DEPRECATED.txt
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