[Python-modules-team] Bug#828929: cairocffi: FTBFS with gcc-6 and glibc 2.23

[Stefano Rivera]

Hi Jean-Christophe (2016.07.02_11:15:36_-0700)
> I don’t think it has anything to do with gcc/glibc.

I agree. I suggest doing a build with a debug python interpreter, then
you get a very helpful error message:

$ LC_ALL=C.UTF-8 xvfb-run -a --server-args="-screen 0 1024x768x24" python3-dbg -m pytest
==================================== test session starts ====================================
platform linux -- Python 3.5.2+, pytest-3.0.2, py-1.4.31, pluggy-0.3.1
rootdir: /build/cairocffi-op2T2E/cairocffi-0.7.2, inifile:
collected 44 items 

cairocffi/test_cairo.py ......................................
cairocffi/test_pixbuf.py ....
cairocffi/test_xcb.py FF

========================================= FAILURES ==========================================
______________________________________ test_xcb_pixmap ______________________________________

xcb_conn = <xcffib.Connection object at 0x7f997f5672c8>

    def test_xcb_pixmap(xcb_conn):
        width = 10
        height = 10

        # create a new window
        wid = create_window(xcb_conn, width, height)
        # create the pixmap used to draw with cairo
        pixmap = create_pixmap(xcb_conn, wid, width, height)
        # create graphics context to copy pixmap on window
        gc = create_gc(xcb_conn)

        # create XCB surface on pixmap
        root_visual = find_root_visual(xcb_conn)
>       surface = XCBSurface(xcb_conn, pixmap, root_visual, width, height)

cairocffi/test_xcb.py:128:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <cairocffi.xcb.XCBSurface object at 0x7f997f56bf60>
conn = <xcffib.Connection object at 0x7f997f5672c8>, drawable = 2097153
visual = <xcffib.xproto.VISUALTYPE object at 0x7f997f56b398>, width = 10, height = 10

    def __init__(self, conn, drawable, visual, width, height):
        c_visual = visualtype_to_c_struct(visual)

        p = cairo.cairo_xcb_surface_create(
>           conn._conn, drawable, c_visual, width, height)
E       TypeError: initializer for ctype 'xcb_connection_t *' appears indeed to be 'xcb_connection_t *', but the types are different (check that you are not e.g. mixing up different ffi instances)

cairocffi/xcb.py:38: TypeError
______________________________________ test_xcb_window ______________________________________

xcb_conn = <xcffib.Connection object at 0x7f99858430c0>

    @pytest.mark.xfail(cairo_version() < 11200,
                       reason="Cairo version too low")
    def test_xcb_window(xcb_conn):
        width = 10
        height = 10

        # create a new window used to draw with cairo
        wid = create_window(xcb_conn, width, height)

        # map the window and wait for it to appear
        xcb_conn.core.MapWindow(wid)
        xcb_conn.flush()

        start = time.time()
        while time.time() < start + 10:
            event = xcb_conn.wait_for_event()
            if isinstance(event, xcffib.xproto.ExposeEvent):
                break
        else:
            pytest.fail("Never received ExposeEvent")

        # create XCB surface on window
        root_visual = find_root_visual(xcb_conn)
>       surface = XCBSurface(xcb_conn, wid, root_visual, width, height)

cairocffi/test_xcb.py:192:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <cairocffi.xcb.XCBSurface object at 0x7f997f56ec88>
conn = <xcffib.Connection object at 0x7f99858430c0>, drawable = 2097152
visual = <xcffib.xproto.VISUALTYPE object at 0x7f998583d948>, width = 10, height = 10

    def __init__(self, conn, drawable, visual, width, height):
        c_visual = visualtype_to_c_struct(visual)

        p = cairo.cairo_xcb_surface_create(
>           conn._conn, drawable, c_visual, width, height)
E       TypeError: initializer for ctype 'xcb_connection_t *' appears indeed to be 'xcb_connection_t *', but the types are different (check that you are not e.g. mixing up different ffi instances)

cairocffi/xcb.py:38: TypeError
============================ 2 failed, 42 passed in 0.87 seconds ============================

-- 
Stefano Rivera
  http://tumbleweed.org.za/
  +1 415 683 3272