[Qt-interest] undefined symbol on Linux/ubuntu

[Thiago Macieira]

Em Domingo 19 Julho 2009, às 10:38:51, M. Bashir Al-Noimi escreveu:
> Hi All,
>
> I tried to run QCat software on my ubuntu but it gave me the following
> error message:
>
> ./qcat: symbol lookup error: ./qcat: undefined symbol: _Z13qFlagLocationPKc
>
>
> How I can fix this issue for running my executable? is there any missing
> libs?

You're missing Qt 4.5. Your program was compiled for that version but it's 
finding an earlier version.

>     * my system path is:
>
> /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/op
>t/qtsdk-2009.03/qt/bin:/opt/qtsdk-2009.03/qt/lib

PATH is for finding executables.

For finding libraries, it's LD_LIBRARY_PATH. 

>     * The ldd output for qcat executable is:
>
> 	linux-gate.so.1 =>  (0xb8014000)
> 	libQtSql.so.4 => /usr/lib/libQtSql.so.4 (0xb7fa2000)
> 	libQtXml.so.4 => /usr/lib/libQtXml.so.4 (0xb7f5e000)
> 	libQtGui.so.4 => /usr/lib/libQtGui.so.4 (0xb765a000)
[snip]

As you can see, your executable found the system library, which is most likely 
Qt 4.4.

Your options are:
1) upgrade your system to Qt 4.5
2) set LD_LIBRARY_PATH to point to the SDK-provided Qt 4.5
3) use RPATH when linking your executable
4) any combination of the above.

From the options available, the combination 1 & 2 is the best.

-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Product Manager - Nokia, Qt Software
     Sandakerveien 116, NO-0402 Oslo, Norway
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