setup.py: make build fail if undeclared symbols are used

This will detect cases where the autoconfig based on version is wrong.

Debian bug #839224.

Author: keszybz

setup.py

@@ -46,24 +46,29 @@ def lib(*names, **kw):
 _journal = Extension('systemd/_journal',
                      sources = ['systemd/_journal.c',
                                 'systemd/pyutil.c'],
+                     extra_compile_args=['-Werror=implicit-function-declaration'],
                      **lib('libsystemd', 'libsystemd-journal', **defines))
 _reader = Extension('systemd/_reader',
                      sources = ['systemd/_reader.c',
                                 'systemd/pyutil.c',
                                 'systemd/strv.c'],
+                     extra_compile_args=['-Werror=implicit-function-declaration'],
                      **lib('libsystemd', 'libsystemd-journal', **defines))
 _daemon = Extension('systemd/_daemon',
                      sources = ['systemd/_daemon.c',
                                 'systemd/pyutil.c'],
+                     extra_compile_args=['-Werror=implicit-function-declaration'],
                      **lib('libsystemd', 'libsystemd-daemon', **defines))
 id128 = Extension('systemd/id128',
                      sources = ['systemd/id128.c',
                                 'systemd/pyutil.c'],
+                     extra_compile_args=['-Werror=implicit-function-declaration'],
                      **lib('libsystemd', 'libsystemd-id128', **defines))
 login = Extension('systemd/login',
                      sources = ['systemd/login.c',
                                 'systemd/pyutil.c',
                                 'systemd/strv.c'],
+                     extra_compile_args=['-Werror=implicit-function-declaration'],
                      **lib('libsystemd', 'libsystemd-login', **defines))
 setup (name = 'systemd-python',
        version = version,