Ninja Color Output

Make colors the output fine by default, nice. My default configuration with Make/Clang colors my output just fine. But if I simply change my generator to Ninja, the pretty coloring is.

Hi, How can I enable color output when using the Ninja generator? I have set CMAKE_COLOR_DIAGNOSTICS to ON and also tried adding the -fdiagnostics-color=always compiler option, but still, no color is displayed. Another cause is that if Ninja itself doesn't see a terminal, such as when you pipe it into Less, it removes color codes from its buffered subprocess output. The way Ninja supports disabling this is with an environment variable.

With current ninja colored output exists only in the "smart" way. ninja deactivates the colors, when piped into something: $ ninja # colored output $ ninja cat # not colored output A lot of programs (like ls and grep) have a command li. With CMAKE_COLOR_MAKEFILE (default to ON) CMake creates target descriptions with colors.

This is great for human readability. However, with the Ninja generator there is no such option, and CMake doesn't emit any color: the output is much harder to read by a human. Would it be possible to add a CMAKE_COLOR_NINJA equivalent to CMAKE_COLOR_MAKEFILE, but for the Ninja generator?

Ninja itself will detect if it's writing to a terminal and escape color codes from commands if it isn't. The reason being, I like using less to keep the start of the output at the top of the screen, but I also find colored output very useful. 不幸的是，最近这些天在使用Ninja和Apple Clang时，无论是 -fdiagnostics-color=always 还是所谓的clang等效选项 -fcolor-diagnostics，都没有任何作用。.

On POSIX, terminal color can be modified through ANSI escape codes, and if you put ANSI escape codes in your command's description, ninja will write it through to the terminal unmodified. That way, you can have colored descriptions. This build.ninja produces colored output: $ less build.ninja.

To enable colored diagnostic outputs when using GCC or Clang with Ninja builds, you need to ensure that the compilers are configured to output colors by using the right flags. For GCC or Clang put -fdiagnostics-color=always in the CMAKE_CXX_FLAGS and CMAKE_C_FLAGS variable. That works quite well with Ninja and Makefiles generators.