"make docs" segfaults in current 4.7 git branch

[...]
/usr/src/ark/BUILD/qt/src/declarative/graphicsitems/qdeclarativeitem.cpp:621: Cannot link to 'Qt::Key' in Keys
QmlClassNode::subclasses(): 36 "Item" subs: 36
Generator::appendSortedQmlNames(): "Item" is inherited by...
     "FocusPanel"
     "Flickable"
     "Image"
     "Rectangle"
     "BorderImage"
     "MouseArea"
     "Text"
     "Flow"
     "Grid"
     "Row"
     "Column"
     "PathView"
     "Loader"
     "FocusScope"
     "Particles"
     "Repeater"
     "Flipable"
/bin/sh: line 1: 25059 Segmentation fault      QT_BUILD_TREE=/usr/src/ark/BUILD/qt QT_SOURCE_TREE=/usr/src/ark/BUILD/qt /usr/src/ark/BUILD/qt/bin/qdoc3 qt-api-only.qdocconf assistant.qdocconf designer.qdocconf linguist.qdocconf qmake.qdocconf qdeclarative.qdocconf
make: *** [qch_docs] Error 139

Program received signal SIGSEGV, Segmentation fault.
QString (this=0xd0b1980, string=...)
    at ../../include/QtCore/../../src/corelib/tools/qstring.h:727
727     { Q_ASSERT(&other != this); d->ref.ref(); }
(gdb) bt
#0  QString (this=0xd0b1980, string=...)
    at ../../include/QtCore/../../src/corelib/tools/qstring.h:727
#1  QTextStreamPrivate::putString (this=0xd0b1980, string=...)
    at io/qtextstream.cpp:964
#2  QTextStream::operator<< (this=0xd0b1980, string=...)
    at io/qtextstream.cpp:2524
#3  0x00000000004751ab in QDebug::operator<< (this=<value optimized out>,
    text=<value optimized out>, base=<value optimized out>, subs=...,
    marker=<value optimized out>)
    at ../../include/QtCore/../../src/corelib/io/qdebug.h:112
#4  Generator::appendSortedQmlNames (this=<value optimized out>,
    text=<value optimized out>, base=<value optimized out>, subs=...,
    marker=<value optimized out>) at generator.cpp:1199
#5  0x00000000004926f4 in HtmlGenerator::generateQmlInheritedBy (
    this=0x7fffffffd4f0, cn=0x2041e70, marker=0x7fffffffdd70)
    at htmlgenerator.cpp:4353
#6  0x00000000004a0b8f in HtmlGenerator::generateFakeNode (this=0x7fffffffd4f0,
    fake=0x2041e70, marker=<value optimized out>) at htmlgenerator.cpp:1539
#7  0x00000000004d30db in PageGenerator::generateInnerNode (
    this=0x7fffffffd4f0, node=0x2041e70, marker=0x7fffffffdd70)
    at pagegenerator.cpp:224
#8  0x00000000004d3094 in PageGenerator::generateInnerNode (
    this=0x7fffffffd4f0, node=0x3ca7700, marker=0x7fffffffdd70)
    at pagegenerator.cpp:232
#9  0x00000000004add43 in HtmlGenerator::generateTree (this=0x7fffffffd4f0,
    tree=<value optimized out>, marker=<value optimized out>)
    at htmlgenerator.cpp:365
#10 0x00000000004c4c53 in processQdocconfFile (fileName=<value optimized out>)
    at main.cpp:340
#11 0x00000000004c70bc in main (argc=7, argv=<value optimized out>)
    at main.cpp:470