Am 21.03.23 um 11:18 schrieb Masahiro Yamada:
"make bindeb-pkg" also runs in 16 threads because $(DEB_BUILD_OPTIONS) always contains "parallel=16" even if -j<N> option is given at all. In other words, this patch will take away user's freedom to choose the number of threads.
Okay. To solve this, I would forward make's -j option to the dpkg-buildpackage calls, which is now called with the defaults. I think you should see the warning with older dpkg-buildpackage versions without the patch applied as well because their default is dpkg-buildpackage -j`nproc` and is in effect currently.