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I see this on all Debian and Ubuntu releases, when stdout is redirected. I expect to see the compiler and linker invocations for the sharedmods target, but I only see stderr (compiler and linker warnings).
e.g. make 2>&1 | tee log
or script -c 'make' log
can this be reproduced on Debian/Ubuntu, or is this seen on other Linux distributions as well?

bah, this happens when you do a parallel build. --jobserver-fds is passed in MAKEFLAGS, and the test for sharedmods turns on the quiet mode, because it matches just *s* in MAKEFLAGS :-/
The patch tries to parse MAKEFLAGS using getopt, and if getopt is not available, falls back to MAKEFLAGS, and then tries to match -s.
The only downside is that you won't get a quiet build, if you don't have getopt, and pass MAKEFLAGS options as a combined option (e.g. -fs).

New changeset 1a1d097b17e2 by Matthias Klose in branch '2.7':
- Issue #15591: Fix parsing MAKEFLAGS in the sharedmods target.
http://hg.python.org/cpython/rev/1a1d097b17e2
New changeset 763d188a96bb by Matthias Klose in branch '3.2':
- Issue #15591: Fix parsing MAKEFLAGS in the sharedmods target.
http://hg.python.org/cpython/rev/763d188a96bb
New changeset 3a3fd48a6ef7 by Matthias Klose in branch 'default':
- Issue #15591: Fix parsing MAKEFLAGS in the sharedmods target.
http://hg.python.org/cpython/rev/3a3fd48a6ef7 

fixed.

This seems to have broken parallel building of modules.

The fix doesn't work for me. With "make -s" I still see the output to stdout. Also there are much simpler ways to test for MAKEFLAGS:
ifneq (,$(findstring s,$(MAKEFLAGS)))
 QUIET="-q"
else
 QUIET=""
endif
then use $(QUIET) in the call to setup.py

@benjamin: no, the extensions were never built in parallel
@christian: no, that again would match the `s' when you have something like --jobserver in MAKEFLAGS.

Ah, got it. GNU sorts the arguments in MAKEFLAGS. The "s" flag is always in the first word.
$ make -j4 -s
"s --jobserver-fds=3,4 -j"
$ make --quiet -j4
"s --jobserver-fds=3,4 -j"
This make code works well for me:
ifeq (s,$(findstring s,$(word 1,$(MAKEFLAGS))))
 QUIET=-q
else
 QUIET=
endif
I've attached a patch that also fixes the quiet option for ctypes configure script.

even if you pass other options to make, and -s not as the first flag? and does this work for other makes different than GNU make too? But maybe we already require GNU make.

The lines under each of my examples are the content of $MAKEFLAGS. It works when I pass the option in a different order and even with alternative spellings for -s like --quiet. It's always the "s" flag:
$ make -s --jobs=4
"s --jobserver-fds=3,4 -j"
$ make --jobs=4 --silent
"s --jobserver-fds=3,4 -j"
$ make --jobs=4 --quiet
"s --jobserver-fds=3,4 -j"
$ make --jobs=4 --quiet -n
echo '"sn --jobserver-fds=3,4 -j"'
With just the -j flag $MAKEFLAGS starts with a space so the first word is empty:
$ make -j4
" --jobserver-fds=3,4 -j"
I don't know if other make implementations work similar but I think we require GNU Make, too.

New changeset 048e13546a7c by Christian Heimes in branch '3.2':
Issue #15591: run ctypes' configure in quiet mode when setup.py runs silently
http://hg.python.org/cpython/rev/048e13546a7c
New changeset e5569b03a287 by Christian Heimes in branch 'default':
Issue #15591: run ctypes' configure in quiet mode when setup.py runs silently
http://hg.python.org/cpython/rev/e5569b03a287
New changeset 962e8b2a39f3 by Christian Heimes in branch '2.7':
Issue #15591: run ctypes' configure in quiet mode when setup.py runs silently
http://hg.python.org/cpython/rev/962e8b2a39f3 

New changeset b9261dd34289 by Christian Heimes in branch '3.2':
Issue #15591 and Issue #11715: silence output of setup.py when make is run with -s option.
http://hg.python.org/cpython/rev/b9261dd34289
New changeset fcc629208842 by Christian Heimes in branch 'default':
Issue #15591 and Issue #11715: silence output of setup.py when make is run with -s option.
http://hg.python.org/cpython/rev/fcc629208842
New changeset 2587aeb616b6 by Christian Heimes in branch '2.7':
Issue #15591 and Issue #11715: silence output of setup.py when make is run with -s option.
http://hg.python.org/cpython/rev/2587aeb616b6
New changeset 4807ed8a627e by Christian Heimes in branch 'default':
Issue #15591 and Issue #11715: silence output of setup.py when make is run with -s option.
http://hg.python.org/cpython/rev/4807ed8a627e 

New changeset 8cd6acffbcb9 by Christian Heimes in branch '2.7':
Issue #15591 and Issue #11715: silence output of setup.py when make is run with -s option.
http://hg.python.org/cpython/rev/8cd6acffbcb9