# CMP0103

Multiple calls to `export()` command with same `FILE` without `APPEND` is no longer allowed.

In CMake 3.17 and below, multiple calls to `export()` command with the same `FILE` without `APPEND` are accepted silently but only the last occurrence is taken into account during the generation.

The `OLD` behavior for this policy is to ignore the multiple occurrences of

  `export()` command except the last one.

The `NEW` behavior of this policy is to raise an error on second call to `export()` command with same `FILE` without `APPEND`.

This policy was introduced in CMake version 3.18. CMake version 3.18.3 warns when the policy is not set and uses `OLD` behavior. Use the `cmake_policy()` command to set it to `OLD` or `NEW` explicitly.

Note

The `OLD` behavior of a policy is `deprecated by definition` and may be removed in a future version of CMake.