Xavier de Gaye <xdeg...@gmail.com> added the comment:

Steve wrote:
> In my build, I've set PYTHON_FOR_BUILD=python3.8

This will not work, PYTHON_FOR_BUILD when cross-compiling is set by configure 
as:

PYTHON_FOR_BUILD='_PYTHON_PROJECT_BASE=$(abs_builddir) 
_PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(shell test -f 
pybuilddir.txt && echo $(abs_builddir)/`cat pybuilddir.txt`:)$(srcdir)/Lib 
_PYTHON_SYSCONFIGDATA_NAME=_sysconfigdata_$(ABIFLAGS)_$(MACHDEP)_$(MULTIARCH) 
'$interp

FWIW there is no problem cross-compiling Python and the standard library 
extension modules on Android, see for example the 'termux' Android application 
and its Python build.

On the other hand there are problems when cross-compiling third party extension 
modules due to:
* PYTHON_FOR_BUILD must be set correctly.
* distutils is still refering to sysconfig values of the build system instead 
of the target system.
But setup.py handles this correctly and does not need to be modified.

----------
nosy: +xdegaye

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