Draft: Reflect --log-level value in CMAKE_MESSAGE_LOG_LEVEL non-cache var
Previously the CMAKE_MESSAGE_LOG_LEVEL variable was unset if the --log-level option was specified on the command line, which made it impossible to query what is the current log level.
Assign the --log-level value to a global non-cache CMAKE_MESSAGE_LOG_LEVEL variable which can be queried anywhere in the project.
If both --log-level and the CMAKE_MESSAGE_LOG_LEVEL cache var are set, the log-level takes precedence.
If neither --log-level nor the CMAKE_MESSAGE_LOG_LEVEL cache var are set, report the default log level (STATUS).
This means CMAKE_MESSAGE_LOG_LEVEL will always have a value now.
The priority is --log-level > cache > default (STATUS)
The new behavior also applies to script mode.
Fixes: #23572 (closed)
Edited by alcroito