[MacPorts] #45354: gdk-pixbuf2 @2.31.1 Hidden dependency on shared-mime-info

[MacPorts]

#45354: gdk-pixbuf2 @2.31.1 Hidden dependency on shared-mime-info
------------------------+--------------------------------
 Reporter:  bgilbert@…  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.1
 Keywords:              |       Port:  gdk-pixbuf2
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 When reading an image file, gdk-pixbuf has two ways to select an
 appropriate loader: via GIO format sniffing, or via magic numbers provided
 by the individual loaders.  Any particular build of gdk-pixbuf uses only
 one of these methods.  By default, gdk-pixbuf uses GIO format sniffing if
 the `shared-mime-info` database is available at compile time, and built-in
 sniffing otherwise.

 The `gdk-pixbuf2` package does not declare `shared-mime-info` as a build
 dependency, but apparently it is installed on the build servers, as GIO
 sniffing ends up enabled:

 {{{
 $ nm -u /opt/local/lib/libgdk_pixbuf-2.0.dylib | grep g_content_type_guess
 _g_content_type_guess
 }}}

 Since `shared-mime-info` is also not declared as a runtime dependency,
 `port install gdk-pixbuf2` on a pristine system will install a gdk-pixbuf
 that refuses to open any image files.

 Possible fixes:

 1. Add a `shared-mime-info` dependency to `glib2`, since GIO is really the
 component that uses the `shared-mime-info` database.

 2. Add a `shared-mime-info` dependency to `gdk-pixbuf2`, and either build-
 depend on `shared-mime-info` or configure with `--enable-gio-sniffing`.

 3. Configure `gdk-pixbuf2` with `--disable-gio-sniffing`.

-- 
Ticket URL: <https://trac.macports.org/ticket/45354>
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