making Ninja build output silent

Code
1

i noticed that Ninja prints build commands to the console. With Unix Makefile this doesn’t happen. I don’t have verbose build enabled. Is there a way to make Ninja builds silent?

Reproducer:

cmake_minimum_required(VERSION 3.20)
project(MyProj)

add_custom_target(tgt ALL COMMAND echo hi)

results in the following build output:

-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/test/build
[1/1] cd /tmp/test/build && echo hi
hi

Notice the cd /tmp/test/build && echo hi output.
In Makefiles it doesn’t happen:

-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/test/build
hi
Built target tgt
2

When you add a description to the custom target or command, this will be printed instead.

3

AFAIK there is no way to silence Ninja output currently.

This PR may be of interest to you though since it adds --quiet to Ninja.

There is currently no release of Ninja that has the new --quiet flag as of 11/6/2021