In Python-2.5b2 I tried to do this:

./configure --without-threads
gmake

The build will fail with an undefined
reference to _PyThread_CurrentFrames

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I can confirm this error on Linux, below is the output,

gcc  -Xlinker -export-dynamic -o python \
                Modules/python.o \
                libpython2.5.a -ldl  -lutil   -lm  
libpython2.5.a(posixmodule.o): In function `posix_tmpnam':
./Modules/posixmodule.c:6701: warning: the use of `tmpnam'
is dangerous, better 
use `mkstemp'
libpython2.5.a(posixmodule.o): In function `posix_tempnam':
./Modules/posixmodule.c:6654: warning: the use of `tempnam'
is dangerous, better
 use `mkstemp'
libpython2.5.a(sysmodule.o): In function `sys_current_frames':
Python/sysmodule.c:675: undefined reference to
`_PyThread_CurrentFrames'
collect2: ld returned 1 exit status
make: *** [python] Error 1


Thanks, Matt

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Fix in patch #1524724. If someone gives it the thumbs up, I
can commit it.

Matt

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Fixed in rev 50708.  That made _PyThread_CurrentFrames()
available in all builds, and fiddled test_sys so that the
test for sys._current_frames() passes with or without
threads.  test_sys still fails in a build without threads,
but for an unrelated reason.