python-windows: Add libffi dependency

projects/python-windows/build

@@ -10,6 +10,20 @@ openssldir=/var/tmp/dist/openssl/openssl
 cp -a $openssldir/include/openssl /var/tmp/dist/mingw-w64/[% c("arch") %]-w64-mingw32/include/openssl
 cp -a $openssldir/lib/* $openssldir/bin/*.dll /var/tmp/dist/mingw-w64/[% c("arch") %]-w64-mingw32/lib/
 
+# Required for "import ctypes"
+tar -C /var/tmp/dist -xf [% c('input_files_by_name/libffi-src') %]
+pushd /var/tmp/dist/*libffi*
+# The Python devs got high on LSD and appear to have committed the libffi
+# source code from a Windows machine, which stripped off all the +x bits.
+# Kids, drugs and coding don't mix.
+chmod -R +x ./
+./configure --host=[% c("arch") %]-w64-mingw32
+# Always errors on this step, but still produces the .dll files we want.
+make || true
+cp ./[% c("arch") %]-w64-mingw32/include/*.h /var/tmp/dist/mingw-w64/[% c("arch") %]-w64-mingw32/include
+cp ./[% c("arch") %]-w64-mingw32/.libs/* /var/tmp/dist/mingw-w64/[% c("arch") %]-w64-mingw32/lib/
+popd
+
 mkdir -p /var/tmp/build
 tar -C /var/tmp/build -xf [% c('input_files_by_name/python') %]
 tar -C /var/tmp/build -xf [% c('input_files_by_name/meson') %]
@@ -65,8 +79,8 @@ ninja -C builddir install
 find $distdir -name '*.a' -exec rm '{}' +
 # These files don't reproduce, and are useless
 
-# Required for "import ssl"
-cp $openssldir/bin/*.dll $gcclibs/*.dll $distdir/bin/
+# Required for "import ssl" and "import ctypes"
+cp $openssldir/bin/*.dll /var/tmp/dist/*libffi*/[% c("arch") %]-w64-mingw32/.libs/*.dll $gcclibs/*.dll $distdir/bin/
 
 cd /var/tmp/dist
 [% c('tar', {

projects/python-windows/config

@@ -14,6 +14,10 @@ var:
     - zip
     - git # maybe possible to omit these
   compiler: mingw-w64
+  post_pkginst: |
+    mkdir -p /usr/i686-w64-mingw32/sys-root/mingw/lib/libffi-3.1/
+    # Yes, Meson uses "i686" in the sysroot name even for 64-bit.  v0v
+    ln -s -T /var/tmp/dist/cpython-source-deps-libffi-3.4.2/[% c("arch") %]-w64-mingw32/include /usr/i686-w64-mingw32/sys-root/mingw/lib/libffi-3.1/include
 
 input_files:
   - project: container-image
@@ -53,4 +57,7 @@ input_files:
   - filename: omit-build-timestamp.patch
   - name: openssl
     project: openssl
+  - name: libffi-src
+    URL: https://github.com/python/cpython-source-deps/archive/refs/tags/libffi-3.4.2.tar.gz
+    sha256sum: 9f9edfbb59a142a8624cec574eeac0caf98c2e51a15e6c9f099b83aaf0942c22