make --silent

I have noticed that some people post examples using make --silent (-s).
I found this actually kind of neat to use from time to time, because
then you only see output if you have warnings or errors. But we get
some extra output that doesn't quite fit:

Writing postgres.bki
Writing schemapg.h
Writing postgres.description
Writing postgres.shdescription
Writing fmgroids.h
Writing fmgrtab.c
Processing HTML.index...
2406 entries loaded...
0 entries ignored...
Done.
Note: Writing man3/SPI_connect.3
Note: Writing man3/SPI_finish.3
Note: Writing man3/SPI_push.3
...
Note: Writing man1/pg_test_timing.1
Note: Writing man1/pg_upgrade.1
Note: Writing man1/pg_xlogdump.1
In file included from gram.y:13612:0:
scan.c: In function ‘yy_try_NUL_trans’:
scan.c:10181:23: warning: unused variable ‘yyg’ [-Wunused-variable]
PostgreSQL, contrib, and documentation successfully made. Ready to install.

Is there interest in silencing this extra output (not the compiler
warning) when make -s is used? The documentation tools have options to
do so, the rest are our own scripts.