In Modules/timemodule.c, py_process_time() still uses floatclock() even when HAVE_CLOCK isn’t defined.

What is your platform?

time.process_time() supports many functions:

 - GetProcessTimes() (Windows only)
 - clock_gettime(CLOCK_PROF)
 - clock_gettime(CLOCK_PROCESS_CPUTIME_ID)
 - getrusage(RUSAGE_SELF)
 - times()
 - clock()

On POSIX, clock() is always tried as a fallback. Does your platform support at least one of these functions?

See also the PEP 418:
http://legacy.python.org/dev/peps/pep-0418/#time-process-time

I’m building against the Newlib libc, for the Wii, and it seems the issue leading to all of those functions not working is:
(.text.clock+0x18): undefined reference to `_times_r'

Threading is disabled, and reentrant functions as well, which could explain that.

But still, when pyconfig.h doesn’t define any HAVE_ macro to get the system time, I would expect py_process_time() to return None or something instead of failing to build.

Please attach your pyconfig.h file.

Sorry but the Wii console is not supported. You have to maintain your fork/patch.

Python 3 don't support platforms without clock().

New changeset 1452520dfe7b by Victor Stinner in branch 'default':
Issue #22624: Python 3 requires clock() to build
https://hg.python.org/cpython/rev/1452520dfe7b