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33 lines
1.5 KiB
33 lines
1.5 KiB
10 years ago
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CMP0056
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-------
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Honor link flags in :command:`try_compile` source-file signature.
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The :command:`try_compile` command source-file signature generates a
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``CMakeLists.txt`` file to build the source file into an executable.
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In order to compile the source the same way as it might be compiled
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by the calling project, the generated project sets the value of the
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:variable:`CMAKE_<LANG>_FLAGS` variable to that in the calling project.
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The value of the :variable:`CMAKE_EXE_LINKER_FLAGS` variable may be
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needed in some cases too, but CMake 3.1 and lower did not set it in
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the generated project. CMake 3.2 and above prefer to set it so that
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linker flags are honored as well as compiler flags. This policy
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provides compatibility with the pre-3.2 behavior.
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The OLD behavior for this policy is to not set the value of the
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:variable:`CMAKE_EXE_LINKER_FLAGS` variable in the generated test
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project. The NEW behavior for this policy is to set the value of
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the :variable:`CMAKE_EXE_LINKER_FLAGS` variable in the test project
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to the same as it is in the calling project.
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If the project code does not set the policy explicitly, users may
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set it on the command line by defining the
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:variable:`CMAKE_POLICY_DEFAULT_CMP0056 <CMAKE_POLICY_DEFAULT_CMP<NNNN>>`
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variable in the cache.
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This policy was introduced in CMake version 3.2. Unlike most policies,
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CMake version |release| does *not* warn by default when this policy
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is not set and simply uses OLD behavior. See documentation of the
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:variable:`CMAKE_POLICY_WARNING_CMP0056 <CMAKE_POLICY_WARNING_CMP<NNNN>>`
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variable to control the warning.
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