Added in version 3.24.
Enable color diagnostics throughout the generated build system.
This variable uses three states: ON, OFF and not defined.
When not defined:
Makefile Generators initialize the CMAKE_COLOR_MAKEFILE
variable to ON. It controls color buildsystem messages.
GNU/Clang compilers are not invoked with any color diagnostics flag.
When ON:
Makefile Generators produce color buildsystem messages by default.
CMAKE_COLOR_MAKEFILE is not initialized, but may be
explicitly set to OFF to disable color buildsystem messages.
GNU/Clang compilers are invoked with a flag enabling color diagnostics
(-fcolor-diagnostics).
When OFF:
Makefile Generators do not produce color buildsystem messages by
default. CMAKE_COLOR_MAKEFILE is not initialized, but may be
explicitly set to ON to enable color buildsystem messages.
GNU/Clang compilers are invoked with a flag disabling color diagnostics
(-fno-color-diagnostics).
If the CMAKE_COLOR_DIAGNOSTICS environment variable is set, its
value is used. Otherwise, CMAKE_COLOR_DIAGNOSTICS is not defined by
default.
See the CLICOLOR and CLICOLOR_FORCE environment
variables to control color output from CMake command-line tools.