Windows 10: "Fatal error C1060: compiler is out of heap space" when building a C++ library with Pybind11

I'm getting fatal error C1060: compiler is out of heap space trying to build and install a C++ library with Pybind11 on Windows 10. Building works fine on Linux, and also used to work on Windows 10. Any ideas?

Requirement already satisfied: pybind11 in d:\conda_jmetal\lib\site-packages (from bbcomp==0.0.1) (2.6.2)
Building wheels for collected packages: bbcomp
  Building wheel for bbcomp (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: 'D:\conda_jmetal\python.exe' -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\AppData\\Local\\Temp\\pip-req-build-njq44h2v\\setup.py'"'"'; __file__='"'"'C:\\Users\\AppData\\Local\\Temp\\pip-req-build-njq44h2v\\setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\AppData\Local\Temp\pip-wheel-k99xe_02'
       cwd: C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\
  Complete output (14 lines):
  running bdist_wheel
  running build
  running build_ext
  building 'bbcomp' extension
  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -ID:\conda_jmetal\lib\site-packages\pybind11\include -ID:\conda_jmetal\include -ID:\conda_jmetal\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt /EHsc /Tpbbcomp.cpp /Fobuild\temp.win-amd64-3.9\Release\bbcomp.obj /std:c++latest /EHsc /bigobj
  bbcomp.cpp
  C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/bbcomplib.cpp(189): warning C4101: 'ex': unreferenced local variable
  C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/bbcomplib.cpp(216): warning C4267: 'return': conversion from 'size_t' to 'int', possible loss of data
  C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/bbcomplib.cpp(310): warning C4267: 'return': conversion from 'size_t' to 'int', possible loss of data
  C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/hypervolume.cpp(30): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
  C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/interpreter.cpp(651): warning C4273: 'round': inconsistent dll linkage
  C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt\corecrt_math.h(533): note: see previous definition of 'round'
  C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/interpreter.cpp(744): fatal error C1060: compiler is out of heap space
  error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.28.29910\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
  ----------------------------------------
  ERROR: Failed building wheel for bbcomp
  Running setup.py clean for bbcomp
Failed to build bbcomp
Installing collected packages: bbcomp
    Running setup.py install for bbcomp ... error
    ERROR: Command errored out with exit status 1:
     command: 'D:\conda_jmetal\python.exe' -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\AppData\\Local\\Temp\\pip-req-build-njq44h2v\\setup.py'"'"'; __file__='"'"'C:\\Users\\AppData\\Local\\Temp\\pip-req-build-njq44h2v\\setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\AppData\Local\Temp\pip-record-iln1c3ao\install-record.txt' --single-version-externally-managed --compile --install-headers 'D:\conda_jmetal\Include\bbcomp'
         cwd: C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\
    Complete output (17 lines):
    running install
    running build
    running build_ext
    building 'bbcomp' extension
    creating build
    creating build\temp.win-amd64-3.9
    creating build\temp.win-amd64-3.9\Release
    C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -ID:\conda_jmetal\lib\site-packages\pybind11\include -ID:\conda_jmetal\include -ID:\conda_jmetal\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt /EHsc /Tpbbcomp.cpp /Fobuild\temp.win-amd64-3.9\Release\bbcomp.obj /std:c++latest /EHsc /bigobj
    bbcomp.cpp
    C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/bbcomplib.cpp(189): warning C4101: 'ex': unreferenced local variable
    C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/bbcomplib.cpp(216): warning C4267: 'return': conversion from 'size_t' to 'int', possible loss of data
    C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/bbcomplib.cpp(310): warning C4267: 'return': conversion from 'size_t' to 'int', possible loss of data
    C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/hypervolume.cpp(30): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
    C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/interpreter.cpp(651): warning C4273: 'round': inconsistent dll linkage
    C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt\corecrt_math.h(533): note: see previous definition of 'round'
    C:\Users\AppData\Local\Temp\pip-req-build-njq44h2v\./bbcomp-core-source-gplv3/interpreter.cpp(744): fatal error C1060: compiler is out of heap space
    error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.28.29910\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
    ----------------------------------------
ERROR: Command errored out with exit status 1: 'D:\conda_jmetal\python.exe' -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\AppData\\Local\\Temp\\pip-req-build-njq44h2v\\setup.py'"'"'; __file__='"'"'C:\\Users\\AppData\\Local\\Temp\\pip-req-build-njq44h2v\\setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\AppData\Local\Temp\pip-record-iln1c3ao\install-record.txt' --single-version-externally-managed --compile --install-headers 'D:\conda_jmetal\Include\bbcomp' Check the logs for full command output.

Start by reproducing the Windows build command from setup.py and inspect the compiler failure reported at bbcomp-core-source-gplv3/interpreter.cpp:744. Compare the failing MSVC build with the stated working Linux build and determine whether the failure is actionable in pybind11; done means a verified cause and a reproducible resolution or a confirmed external issue.