trellis fails to build with Python 3.8.0b3.

 /usr/bin/cmake -DCMAKE_C_FLAGS_RELEASE:STRING=-DNDEBUG -DCMAKE_CXX_FLAGS_RELEASE:STRING=-DNDEBUG -DCMAKE_Fortran_FLAGS_RELEASE:STRING=-DNDEBUG -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON -DCMAKE_INSTALL_PREFIX:PATH=/usr -DINCLUDE_INSTALL_DIR:PATH=/usr/include -DLIB_INSTALL_DIR:PATH=/usr/lib64 -DSYSCONF_INSTALL_DIR:PATH=/etc -DSHARE_INSTALL_PREFIX:PATH=/usr/share -DLIB_SUFFIX=64 -DBUILD_SHARED_LIBS:BOOL=ON libtrellis
CMake Warning at /usr/share/cmake/Modules/FindBoost.cmake:1832 (message):
  No header defined for python-py3803; skipping header check
Call Stack (most recent call first):
  CMakeLists.txt:36 (find_package)


CMake Warning at /usr/share/cmake/Modules/FindBoost.cmake:1832 (message):
  No header defined for python-py380; skipping header check
Call Stack (most recent call first):
  CMakeLists.txt:43 (find_package)


CMake Warning at /usr/share/cmake/Modules/FindBoost.cmake:1832 (message):
  No header defined for python-py38; skipping header check
Call Stack (most recent call first):
  CMakeLists.txt:43 (find_package)


CMake Warning at /usr/share/cmake/Modules/FindBoost.cmake:1832 (message):
  No header defined for python-py3; skipping header check
Call Stack (most recent call first):
  CMakeLists.txt:43 (find_package)


CMake Warning at /usr/share/cmake/Modules/FindBoost.cmake:1832 (message):
  No header defined for python-3.8; skipping header check
Call Stack (most recent call first):
  CMakeLists.txt:75 (find_package)


CMake Error at CMakeLists.txt:82 (message):
  No version of Boost::Python 3.x could be found.


-- The C compiler identification is GNU 9.1.1
-- The CXX compiler identification is GNU 9.1.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.8", minimum required is "3.5") 
-- Found PythonLibs: /usr/lib64/libpython3.8.so (found suitable version "3.8.0b3", minimum required is "3.5") 
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Boost version: 1.69.0
-- Found the following Boost libraries:
--   filesystem
--   thread
--   chrono
--   date_time
--   atomic
-- Could NOT find Boost
-- Could NOT find Boost
-- Could NOT find Boost
-- Could NOT find Boost
-- Could NOT find Boost
-- Could NOT find Boost
-- Could NOT find Boost
-- Could NOT find Boost
-- Configuring incomplete, errors occurred!
See also "/builddir/build/BUILD/prjtrellis-f1b1b355a988b78c746296e097691531d5baf554/CMakeFiles/CMakeOutput.log".
See also "/builddir/build/BUILD/prjtrellis-f1b1b355a988b78c746296e097691531d5baf554/CMakeFiles/CMakeError.log".

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.8/fedora-rawhide-x86_64/00992248-trellis/

For all our attempts to build trellis with Python 3.8, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.8/package/trellis/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.8:
https://copr.fedorainfracloud.org/coprs/g/python/python3.8/

Let us know here if you have any questions.