[Qt-interest] running qt3 app on qt4

[Pavel Koshevoy]

Linking is platform dependent, so don't expect it to work the same way 
on Linux and Windows.  The simplest thing you can do is compile Qt3 from 
sources, yourself.  When configuring Qt3 disable shared libraries.  Then 
rebuild your project using your version of Qt3.  To check which shared 
libraries your executable links against use ldd on Linux and use 
depends.exe on Windows.

Above all, use google and search the qt-interest mail archive ( 
http://www.google.com/search?hl=en&q=Qt+static+linking ).  On Linux use 
the manual pages  --  man ldd, man gcc, man ld, man nm, etc...

With gcc on Linux you can specify -Wl,-Bstatic or -Wl,-Bdynamic gcc 
switch to control which version of the following libraries you want to 
link against (static or dynamic).  These switches will be passed to the 
linker.  When using static libraries the order in which you specify 
libraries on the command line matters.  If static library B depends on 
static library A, and static library C depends on static library B, then 
they have to be specified in that order -lC -lB -lA.  Otherwise you may 
end up with unresolved symbols.

    Pavel.


Puneet Bisht wrote:
> thanks pavel,
> can u provide me some good link on this
>   
>> The obvious solution is to link your application against Qt3 libraries
>> statically.
>>
>>     Pavel.
>>
>> Puneet Bisht wrote:
>>     
>>> hi all,
>>> i have developed a network application on qt3 .
>>> it works fine on machine having qt 3 , now i want to run the application
>>> on machine having qt 4 as their default qt library.
>>> 1 way is to port app on qt4 , is their any other way to ron this app on
>>> qt4 without porting .
>>> thanks in advance.
>>>
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