Build breaks with cmake 3.16 about system-settings HOT 3 CLOSED

d018d27c101869e4e2449f938df89d4f97c5b73c is the first bad commit
commit d018d27c101869e4e2449f938df89d4f97c5b73c
Author: Sebastian Holtermann <[email protected]>
Date:   Fri Sep 13 15:17:24 2019 +0200

    Autogen: Add moc path prefix generation (AUTOMOC_PATH_PREFIX)
    
    The new `AUTOMOC_PATH_PREFIX` boolean target property enables automatic
    generation of the path prefix `-p` option for `moc`.
    `AUTOMOC_PATH_PREFIX` is initialized from the variable
    `CMAKE_AUTOMOC_PATH_PREFIX`, which is ON by default.
    
    When `AUTOMOC_PATH_PREFIX` is enabled, CMake tests if a `moc`ed header file is
    in one of the include directories.  If so, then the `-p` option, with the
    relative path of the header parent directory to the respective include
    directory, is added to the `moc` command.  If the header file is not in an
    include directory, the `-p` option is omitted.
    
    Closes: #18815 "AUTOMOC: generated files include full relative path,
                    breaking certain reproducible builds"

 Modules/CMakeGenericSystem.cmake  |   1 +
 Source/cmQtAutoGenInitializer.cxx |   2 +
 Source/cmQtAutoMocUic.cxx         | 110 ++++++++++++++++++++++++++------------
 Source/cmQtAutoMocUic.h           |   7 +--
 Source/cmTarget.cxx               |   1 +
 5 files changed, 84 insertions(+), 37 deletions(-)
bisect run success