# CMP0044

Case sensitive `<LANG>_COMPILER_ID` generator expressions

CMake 2.8.12 introduced the `<LANG>_COMPILER_ID` `generator expressions` to allow comparison of the `CMAKE_<LANG>_COMPILER_ID` with a test value. The possible valid values are lowercase, but the comparison with the test value was performed case-insensitively.

The `OLD` behavior for this policy is to perform a case-insensitive comparison with the value in the `<LANG>_COMPILER_ID` expression. The `NEW` behavior for this policy is to perform a case-sensitive comparison with the value in the `<LANG>_COMPILER_ID` expression.

This policy was introduced in CMake version 3.0. CMake version 3.15.0-rc3 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.