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Diffstat (limited to 'Help/policy/CMP0057.rst')
| -rw-r--r-- | Help/policy/CMP0057.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Help/policy/CMP0057.rst b/Help/policy/CMP0057.rst new file mode 100644 index 0000000..5cf0784 --- /dev/null +++ b/Help/policy/CMP0057.rst @@ -0,0 +1,21 @@ +CMP0057 +------- + +Disallow multiple ``MAIN_DEPENDENCY`` specifications for the same file. + +CMake 3.3 and above no longer allow the same input file to be used +as a ``MAIN_DEPENDENCY`` in more than one custom command. + +Listing the same input file more than once in this context has not been +supported by earlier versions either and would lead to build time issues +but was not diagnosed. + +The ``OLD`` behavior for this policy is to allow using the same input file +in a ``MAIN_DEPENDENCY`` specfication more than once. +The ``NEW`` behavior is to disallow using the same input file in a +``MAIN_DEPENDENCY`` specification more than once. + +This policy was introduced in CMake version 3.3. +CMake version |release| warns when the policy is not set and uses +``OLD`` behavior. Use the :command:`cmake_policy` command to set +it to ``OLD`` or ``NEW`` explicitly. |