Can't libtbx configure on Windows

[Anthchirp]

running in an empty build directory next to the usual modules/ checkouts with cctbx-base 2021.6 gives:

python ..\modules\cctbx_project\libtbx\configure.py scitbx iotbx cbflib

scitbx is already installed
Traceback (most recent call last):
  File "..\modules\cctbx_project\libtbx\configure.py", line 34, in <module>
    if not run():
  File "..\modules\cctbx_project\libtbx\configure.py", line 29, in run
    libtbx.env_config.cold_start(sys.argv)
  File "C:\DialsBuild\modules\cctbx_project\libtbx\env_config.py", line 3010, in cold_start
    env.process_args(pre_processed_args=pre_processed_args)
  File "C:\DialsBuild\modules\cctbx_project\libtbx\env_config.py", line 1046, in process_args
    assert self.path_utility.isfile()
AssertionError

a
print(abs(self.path_utility))
yields
d:\bld\cctbx-base_1625205021395\_h_env\Lib\site-packages\command_line\path_utility.py,
so it looks like this comes from the prebuilt package?

[bkpoon]

I'll take a look this week. It looks like we're setting an absolute path which can happen on Windows.

[bkpoon]

There are some configuration issues on Windows that I'm looking into this week.

[bkpoon]

The Windows build should work now. It was not working in earlier releases since it was not fully tested.

1. Create the environment with one of the recent nightly builds of the cctbx-base package. The only package in the environment that comes from the cctbx-nightly channel is cctbx-base. Everything else should come from conda-forge.

conda create -n test -c cctbx-nightly -c conda-forge cctbx-base python=3.7 scons hdf5=1.10
conda activate test

2. Configure (dxtbx is on the dials-3.5 branch)

mkdir build
cd build
libtbx.configure dxtbx cbflib

3. Build (the Visual C++ 2017 compiler is already in the path)

libtbx.scons -j 8