configure checks for python3-notmuch2 module

Subject: configure checks for python3-notmuch2 module

Date: Sun, 11 Jul 2021 18:29:57 -0300

To: notmuch@notmuchmail.org

Cc:

From: David Bremner

It turns out we need pyconfig.h to build the (new) python bindings.  I
don't think this is adequately checked for by the configure script,
since I had a Fedora user report a build failure (during make install,
which I found odd) missing pyconfig.h

On Debian this is on libpython3.x-dev, which is not a dependency of the
python3-cffi package.

log follows.
----------------------------------------------------------------------

cd bindings/python-cffi && \
	python3 setup.py build --build-lib build/stage && \
	mkdir -p build/stage/tests && cp tests/*.py build/stage/tests
running build
running build_py
running build_ext
generating cffi module 'build/temp.linux-x86_64-3.9/notmuch2._capi.c'
creating build/temp.linux-x86_64-3.9
building 'notmuch2._capi' extension
creating build/temp.linux-x86_64-3.9/build
creating build/temp.linux-x86_64-3.9/build/temp.linux-x86_64-3.9
gcc -pthread -Wno-unused-result -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I../../lib -I/usr/include/python3.9 -c build/temp.linux-x86_64-3.9/notmuch2._capi.c -o build/temp.linux-x86_64-3.9/build/temp.linux-x86_64-3.9/notmuch2._capi.o
build/temp.linux-x86_64-3.9/notmuch2._capi.c:50:14: fatal error: pyconfig.h: No such file or directory
   50 | #    include <pyconfig.h>
      |              ^~~~~~~~~~~~
compilation terminated.
error: command '/usr/bin/gcc' failed with exit code 1
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