bpo-45582: Fix out-of-tree build issues with new getpath (GH-29902)

[tiran]

• Create getpath.h in builddir tree instead of srcdir tree
• Move getpath.h to Python/frozen_modules so it gets removed on
  make clean and to make it more obvious that it is a frozen file.
• Add dependency on header files
• Remove target body from getpath_noop.o so it uses the .c.o:
  template

https://bugs.python.org/issue45582

[arhadthedev]

Since getpath.h is moved to Python/frozen_modules, the following .gitignore line should be updated accordingly:

cpython/.gitignore

Line 77 in 99fcf15

Modules/getpath.h

Edit: or removed since the directory is already covered by

cpython/.gitignore

Line 140 in 99fcf15

Python/frozen_modules/*.h

[tiran]

@zooba Please take a look

[zooba]

@tiran Looks fine. Out of interest, which bit fixes the out-of-tree issues? I only see changes moving where the generated file goes (which in my defence, changed three times while I was working on that PR 😆 )

---

Edit Found it - removing the $(srcdir) in the output of the freeze_module call

[tiran]

Edit Found it - removing the $(srcdir) in the output of the freeze_module call

Yes, the getpath.h is no longer in $srcdir.

I'm working on CI for OOT builds: #29904

[tiran]

Programs/_freeze_module getpath /home/runner/work/cpython/cpython-ro-srcdir/Modules/getpath.py /home/runner/work/cpython/cpython-ro-srcdir/Modules/getpath.h
cannot open '/home/runner/work/cpython/cpython-ro-srcdir/Modules/getpath.h' for writing

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Arch Linux Asan 3.x has failed when building commit ccb73a0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/582/builds/780) and take a look at the build logs.
4. Check if the failure is related to this commit (ccb73a0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/582/builds/780

Summary of the results of the build (if available):

Click to see traceback logs

Traceback (most recent call last):
File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64.asan/build/Lib/multiprocessing/resource_tracker.py", line 209, in main
cache[rtype].remove(name)
^^^^^^^^^^^^^^^^^^^^^^^^^KeyError: '/psm_94cc1f9a'
Traceback (most recent call last):
File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64.asan/build/Lib/multiprocessing/resource_tracker.py", line 209, in main
cache[rtype].remove(name)
^^^^^^^^^^^^^^^^^^^^^^^^^KeyError: '/psm_eb85fb01'
Traceback (most recent call last):
File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64.asan/build/Lib/multiprocessing/resource_tracker.py", line 209, in main
cache[rtype].remove(name)
^^^^^^^^^^^^^^^^^^^^^^^^^KeyError: '/psm_cae77419'