Commit fbeeaf2 in qtbase adds QT_NO_MIMETYPE: "The mime type stuff generates one of the biggest translation units in QtCore due to the compressed 1.7MB freedesktop.org.xml resource. With QT_NO_MIMETYPE, libQt5Core.so is almost 400Kb smaller (4.8MB->4.4MB gcc 4.9 stripped release build)"
It would be nice to be able to find a middle ground between disabling the mime database completely and adding 1.7MB of data to Qt. The update-mime-database binary from the shared-mime-info package can generate a binary file from the XML, which is 100KB large and still allows finding the mimetype of any file. The only difference with the XML is that you don't have the translated pretty string for the mime type. The binary file can also be mmapped and used for every request very efficiently, instead of allocating all mime types data in memory. -- Arnaud Vrac
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