Christian Heimes <[email protected]> added the comment:
I just realized that PYTHON_FOR_BUILD is far more complicated. Our WASM build
system sets the env var to "$(pwd)/cpython/builddir/build/python". The
configure script expects us to set several additional env vars.
The logic goes like this for cross compiling:
if PYTHON_FOR_BUILD is empty:
find Python interpreter with same version as PACKAGE_VERSION
set PYTHON_FOR_BUILD='_PYTHON_PROJECT_BASE=$(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
else:
use user-supplied PYTHON_FOR_BUILD
Since we don't set any of the variables _PYTHON_PROJECT_BASE,
_PYTHON_HOST_PLATFORM, and _PYTHON_SYSCONFIGDATA_NAME, we get wrong sysconfig
data file.
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<https://bugs.python.org/issue45909>
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