Hi,
I tried run, 3.5.0, 4.0.0 beta, compiled successful 3.5 and 4.0, but still not starting. I can't start.
bash-4.2$ digikam
Segmentation fault
bash-4.2$ gdb digikam
GNU gdb (GDB) 7.6.1
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-slackware-linux".
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/digikam...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/digikam 
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib/libgobject-2.0.so.0.3600.4-gdb.py", line 9, in <module>
    from gobject import register
  File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
    import gdb.backtrace
ImportError: No module named backtrace
warning: the debug information found in "/usr/lib/libqca.so.2.0.2.debug" does not match "/usr/lib/libqca.so.2" (CRC mismatch).


Program received signal SIGSEGV, Segmentation fault.
0xb3c41b69 in strcmp () from /lib/libc.so.6
(gdb) backtrace
#0  0xb3c41b69 in strcmp () from /lib/libc.so.6
#1  0xb2afab43 in QMetaType::registerNormalizedType(QByteArray const&, void (*)(void*), void* (*)(void const*), void (*)(void*), void* (*)(void*, void const*), int, QFlags<QMetaType::TypeFlag>, QMetaObject const*) () from /usr/lib/libQt5Core.so.5
#2  0xb2508a58 in ?? () from /usr/lib/libQt5Gui.so.5
#3  0xb2820c4d in ?? () from /usr/lib/libQt5Gui.so.5
#4  0xb2504da8 in _init () from /usr/lib/libQt5Gui.so.5
#5  0xb7fff000 in ?? () from /lib/ld-linux.so.2
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) 

in dmesg:
[ 9878.962833] digikam[28948]: segfault at 1188d5d0 ip b3379b69 sp bfe76834 error 4 in libc-2.17.so[b32f9000+185000]


Reproducible: Always

Steps to Reproduce:
1. start in terminal