# CMP0044

Warning

The `OLD` behavior of this policy was removed in CMake version 4.0. This policy must be set to `NEW` by a call to `cmake_minimum_required()` or `cmake_policy()`.

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. Prior to removal in CMake version 4.0, it could be set by `cmake_policy()` or `cmake_minimum_required()`. If it was not set, CMake warned, and used `OLD` behavior.