Martin Panter added the comment:
Thanks Robert. Russell also pointed out on python-dev that the patches at Issue
23670 show how he is doing cross compilation, via a new high-level iOS/Makefile
file. Here is a cut-down version of the parts that I find relevant:
# Build for the native build host
host/bin/python*:
make -C .. distclean
cd .. && ./configure --prefix=host ...
make -C .. Programs/_freeze_importlib
# Main makefile is patched to use this copy (3.5+ only):
cp ../Programs/_freeze_importlib .
make -C .. install
tar czf host.tar.gz host && rm -rf host
# Build for a foreign target host
ios-%.tar.gz: host/bin/python*
make -C .. distclean
tar xzf host.tar.gz
cd .. && PATH=host/bin:$(PATH) ./configure \
--host=%-apple-ios --build=$(BUILD_OS_ID) CC=% LD=% \
--prefix=$* ...
PATH=host/bin:$(PATH) make -C .. install
tar czf $*.tar.gz $* && rm -rf $*
Something I just realized is that the output of pgen is actually committed to
the Mercurial repository. It seems that Russell’s cross-compilation was relying
on this to avoid rerunning pgen. Same with the output of _freeze_importlib,
except Russell is working around that differently. It does not seem right to
have files in the repository that are also generated by the normal build
process.
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<http://bugs.python.org/issue22625>
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