[Development] Use static qt libraries

[Rohan McGovern]

song.7.liu at nokia.com said:
> Hi,
> 
> Now we can build out the single libqt5.so (using ARM toolchain) by:
>     
>     "OPTS += -static"  to create the static qt libs
>     "ar -x libQtXX.a" to extract the .o files
>     "armlink --fpic --shared *.o -o libqt5.so" to generate final single so
> 
> But the "readelf -s libqt5.so | grep UND":
> 
>      4: 00000000     0 OBJECT  WEAK   DEFAULT  UND _ZTI12QFocusHelper
>      5: 00000000     0 OBJECT  WEAK   DEFAULT  UND _ZTI17QAbstractUndoItem
>      6: 00000000     0 OBJECT  WEAK   DEFAULT  UND _ZTI19QStaticTextUserData
>      7: 00000000     0 OBJECT  WEAK   DEFAULT  UND _ZTI22QItemEditorCreatorB
>      8: 00000000     0 OBJECT  WEAK   DEFAULT  UND _ZTI26QAbstractDynamicMet
>      9: 00000000     0 OBJECT  WEAK   DEFAULT  UND _ZTI28QNetworkConfigurati
> 
> Does anyone know what is this mangled symbol "_ZTIXX" in C++ ?
> 

The 'c++filt' program can answer this.

  $ echo _ZTI12QFocusHelper | c++filt
  typeinfo for QFocusHelper