manylinux-build-wheels: Configure project with correct options

* To avoid re-downloading the source, pass SimpleITK_SOURCE_DIR

* Specify correct include_dir/library/interpreter.

* Finally, since the python interpreter exports its symbol (see [1]), SimpleITK python
  modules should not link against any python libraries.
  To ensure it is not the case, we configure the project using an empty
  file as python library.


[1] "Note that libpythonX.Y.so.1 is not on the list of libraries that
a manylinux1 extension is allowed to link to. Explicitly linking to
libpythonX.Y.so.1 is unnecessary in almost all cases: the way ELF linking
works, extension modules that are loaded into the interpreter automatically
get access to all of the interpreter's symbols, regardless of whether or
not the extension itself is explicitly linked against libpython. [...]"

Source: https://www.python.org/dev/peps/pep-0513/#libpythonx-y-so-1

Author: jcfr

.gitignore

@@ -1,3 +1,9 @@
+# This project
+scripts/manylinux-libpython-not-needed-symbols-exported-by-interpreter
+skbuild
+standalone-build
+
+# Python
 *.py[cod]
 
 # C extensions

scripts/manylinux-build-wheels.sh

@@ -8,16 +8,45 @@ pushd /work/standalone-build > /dev/null 2>&1
   ninja
 popd > /dev/null 2>&1
 
+# Since the python interpreter exports its symbol (see [1]), SimpleITK python
+# modules should not link against any python libraries.
+# To ensure it is not the case, we configure the project using an empty
+# file as python library.
+#
+# [1] "Note that libpythonX.Y.so.1 is not on the list of libraries that
+# a manylinux1 extension is allowed to link to. Explicitly linking to
+# libpythonX.Y.so.1 is unnecessary in almost all cases: the way ELF linking
+# works, extension modules that are loaded into the interpreter automatically
+# get access to all of the interpreter's symbols, regardless of whether or
+# not the extension itself is explicitly linked against libpython. [...]"
+#
+# Source: https://www.python.org/dev/peps/pep-0513/#libpythonx-y-so-1
+PYTHON_LIBRARY=/work/scripts/manylinux-libpython-not-needed-symbols-exported-by-interpreter
+touch ${PYTHON_LIBRARY}
+
 # Compile wheels re-using standalone project and archive cache
 for PYBIN in /opt/python/*/bin; do
     if [[ ${PYBIN} == *"cp26"* ]]; then
         echo "Skipping ${PYBIN}"
         continue
     fi
+
+    PYTHON_EXECUTABLE=${PYBIN}/python
+    PYTHON_INCLUDE_DIR=$( find -L ${PYBIN}/../include/ -name Python.h -exec dirname {} \; )
+
+    echo ""
+    echo "PYTHON_EXECUTABLE:${PYTHON_EXECUTABLE}"
+    echo "PYTHON_INCLUDE_DIR:${PYTHON_INCLUDE_DIR}"
+    echo "PYTHON_LIBRARY:${PYTHON_LIBRARY}"
+
     ${PYBIN}/pip install --user -r /work/requirements-dev.txt
-    ${PYBIN}/python setup.py bdist_wheel -- \
+    ${PYBIN}/python setup.py bdist_wheel -G Ninja -- \
       -DSimpleITK_DIR:PATH=/work/standalone-build/SimpleITK-superbuild/SimpleITK-build \
-      -DSWIG_EXECUTABLE:PATH=/work/standalone-build/SimpleITK-superbuild/Swig/bin/swig
+      -DSimpleITK_SOURCE_DIR:PATH=/work/standalone-build/SimpleITK \
+      -DSWIG_EXECUTABLE:FILEPATH=/work/standalone-build/SimpleITK-superbuild/Swig/bin/swig \
+      -DPYTHON_EXECUTABLE:FILEPATH=${PYTHON_EXECUTABLE} \
+      -DPYTHON_INCLUDE_DIR:PATH=${PYTHON_INCLUDE_DIR} \
+      -DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBRARY}
     ${PYBIN}/python setup.py clean
 done