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Windows GTK+ 2.24.10: Cairo contexts not rendering to surface




Dear list,

I have raised an issue on the Cairo mailing list, who have referred me here. Your advice would be greatly appreciated.

I'm trying to incorporate Pango-Cairo rendering into a cross-platform project. Windows XP is a target platform for the project, so I am building against the GTK+ 2.24.10 Bundle (20120208). N.B. This is a C/C++ implementation.

The problem I'm having is that no Cairo backend contexts are rendering pixels to their surfaces in my main project's EXE, but are working as expected in a small demo project's EXE.

I followed this guide to setting up my VS 2015 projects: http://stackoverflow.com/questions/15906580/how-to-configure-gtk-on-visual-studio-2010

The significant difference between the structure of the functioning demo project and the main project is that the main project's EXE does not call the GTK+ API directly, but is dependent on a custom static library that is built against the GTK+ libs/dlls.

i.e. GTK+ 2 API calls are made in the functions of the custom static library, whose functions are called in-turn by the main project's EXE.

When building the static library, I receive the following linker warnings that do not appear when building the demo EXE:

1>gdk-win32-2.0.lib(libgdk-win32-2.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>gdk-win32-2.0.lib(libgdk-win32-2.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>atk-1.0.lib(libatk-1.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>atk-1.0.lib(libatk-1.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>gio-2.0.lib(libgio-2.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>gio-2.0.lib(libgio-2.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>pangowin32-1.0.lib(libpangowin32-1.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>pangowin32-1.0.lib(libpangowin32-1.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>gdi32.lib(GDI32.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>gdi32.lib(GDI32.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>pangocairo-1.0.lib(libpangocairo-1.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>pangocairo-1.0.lib(libpangocairo-1.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>gdk_pixbuf-2.0.lib(libgdk_pixbuf-2.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>gdk_pixbuf-2.0.lib(libgdk_pixbuf-2.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>pango-1.0.lib(libpango-1.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>pango-1.0.lib(libpango-1.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>cairo.lib(libcairo-2.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>cairo.lib(libcairo-2.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>gobject-2.0.lib(libgobject-2.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>gobject-2.0.lib(libgobject-2.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>gmodule-2.0.lib(libgmodule-2.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>gmodule-2.0.lib(libgmodule-2.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>gthread-2.0.lib(libgthread-2.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>gthread-2.0.lib(libgthread-2.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>glib-2.0.lib(libglib-2.0-0.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>glib-2.0.lib(libglib-2.0-0.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
1>intl.lib(intl.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR already defined in gtk-win32-2.0.lib(libgtk-win32-2.0-0.dll); second definition ignored
1>intl.lib(intl.dll) : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library

I know that the GTK+ bundle I have is functional, due to the success of the demo project, but would appreciate help configuring my main project.
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