Cython 3.0.0b1 compatibility fix

apply by default and revert the change if we find an old version of Cython

packaging/debian/xpra.sh

@@ -51,6 +51,11 @@ MATCH=`find $REPO_ARCH_PATH/ -name "${DEB_FILENAME}" | wc -l`
 if [ "$MATCH" != "0" ]; then
 	echo "package already exists"
 else
+	#do we need to patch for older versions of Cython?
+	CM=`python3 -c "import cython;print(cython.__version__.split('.')[0])"`
+	if [ "${CM}" == "2" ]; then
+		echo "cython2.patch" >> packaging/debian/xpra/patches/series
+	fi
 	if [ `arch` == "aarch64" ]; then
 		debuild --no-lintian -us -uc -b
 	else

packaging/debian/xpra/patches/cython2.patch

@@ -0,0 +1,46 @@
+diff --git b/xpra/codecs/enc_ffmpeg/encoder.pyx a/xpra/codecs/enc_ffmpeg/encoder.pyx
+index b499dd9b0..b8e914bf2 100644
+--- b/xpra/codecs/enc_ffmpeg/encoder.pyx
++++ a/xpra/codecs/enc_ffmpeg/encoder.pyx
+@@ -1161,7 +1161,7 @@ cdef list_options(void *obj, const AVClass *av_class, int skip=1):
+         list_options(child, child_class, skip-1)
+
+
+-cdef int write_packet(void *opaque, uint8_t *buf, int buf_size) noexcept:
++cdef int write_packet(void *opaque, uint8_t *buf, int buf_size):
+     global GEN_TO_ENCODER
+     encoder = GEN_TO_ENCODER.get(<uintptr_t> opaque)
+     #log.warn("write_packet(%#x, %#x, %#x) encoder=%s", <uintptr_t> opaque, <uintptr_t> buf, buf_size, type(encoder))
+diff --git b/xpra/x11/bindings/xwait.pyx a/xpra/x11/bindings/xwait.pyx
+index f1613c16f..df5dcfefc 100644
+--- b/xpra/x11/bindings/xwait.pyx
++++ a/xpra/x11/bindings/xwait.pyx
+@@ -33,13 +33,13 @@ cdef end(msg, int code = exit_code):
+     exit_event.set()
+
+
+-cdef int x11_io_error_handler(Display *display) noexcept:
++cdef int x11_io_error_handler(Display *display):
+     global message
+     message = b"X11 fatal IO error"
+     exit_code = 0
+     return 0
+
+-cdef int x11_error_handler(Display *display, XErrorEvent *event) noexcept:
++cdef int x11_error_handler(Display *display, XErrorEvent *event):
+     #X11 error handler called (ignored)
+     return 0
+
+diff --git b/xpra/x11/gtk3/gdk_bindings.pyx a/xpra/x11/gtk3/gdk_bindings.pyx
+index dc887cc20..110cac70f 100644
+--- b/xpra/x11/gtk3/gdk_bindings.pyx
++++ a/xpra/x11/gtk3/gdk_bindings.pyx
+@@ -837,7 +837,7 @@ cdef object _gw(display, Window xwin):
+
+ cdef GdkFilterReturn x_event_filter(GdkXEvent * e_gdk,
+                                     GdkEvent * gdk_event,
+-                                    void * userdata) noexcept with gil:
++                                    void * userdata) with gil:
+     cdef object event_args
+     cdef object pyev
+     cdef double start = monotonic()

xpra/codecs/enc_ffmpeg/encoder.pyx

@@ -1161,7 +1161,7 @@ cdef list_options(void *obj, const AVClass *av_class, int skip=1):
         list_options(child, child_class, skip-1)
 
 
-cdef int write_packet(void *opaque, uint8_t *buf, int buf_size):
+cdef int write_packet(void *opaque, uint8_t *buf, int buf_size) noexcept:
     global GEN_TO_ENCODER
     encoder = GEN_TO_ENCODER.get(<uintptr_t> opaque)
     #log.warn("write_packet(%#x, %#x, %#x) encoder=%s", <uintptr_t> opaque, <uintptr_t> buf, buf_size, type(encoder))

xpra/x11/bindings/xwait.pyx

@@ -33,13 +33,13 @@ cdef end(msg, int code = exit_code):
     exit_event.set()
 
 
-cdef int x11_io_error_handler(Display *display):
+cdef int x11_io_error_handler(Display *display) noexcept:
     global message
     message = b"X11 fatal IO error"
     exit_code = 0
     return 0
 
-cdef int x11_error_handler(Display *display, XErrorEvent *event):
+cdef int x11_error_handler(Display *display, XErrorEvent *event) noexcept:
     #X11 error handler called (ignored)
     return 0
 

xpra/x11/gtk3/gdk_bindings.pyx

@@ -837,7 +837,7 @@ cdef object _gw(display, Window xwin):
 
 cdef GdkFilterReturn x_event_filter(GdkXEvent * e_gdk,
                                     GdkEvent * gdk_event,
-                                    void * userdata) with gil:
+                                    void * userdata) noexcept with gil:
     cdef object event_args
     cdef object pyev
     cdef double start = monotonic()