Rebuilding Qt from source

[sn00p]

Hi,

I have a question about rebuilding Qt, I've been trying all day to get something working but have not been able to thus far.

The situation is this, my development machine is running QtCreator with the 4.8.0 SDK. I have built a simple application (for the purposes of testing the rebuilt qt libraries) which requires only QtCore, it's a command line application that prints "Hello World".

If I put this in a folder, along with the dependencies, set PATH to nothing and run from the command line the application runs and says "Hello World".

Perfect.

Now, I downloaded the source to 4.8.2 and built this (I used the settings from the .cache for my configure).

Now, if I drop this DLL into the application folder and try running, I get an error about libstdc++-6.dll being missing, clearly what I've built is not how the SDK version was built.

Furthermore, if I put this DLL in the folder, the application stops complaining about the DLL being missing, but subsequently crashes without showing "Hello World".

By playing with the mkspec, I can get the libstdc++ to be statically linked into the binary so that the dependency goes, but I still crash.

I should be able to replace the SDK 4.8.0 QtCore4.dll with my 4.8.2 "home built" DLL and the original application should be happy, but it isn't.

My question is, how do I build Qt to exactly the same "spec" as the trolls did? I.e, compilers, options, path settings etc.

I'm just about to try the experiment again but using the mingw from the 4.8.0 dist (I was using a different mingw) just incase that makes a difference.

Any help or pointers would be appreciated.

Thanks.

Adrian

[wysota]

While configure.exe runs, it auto-detects features available on your system and builds Qt according to those. After detecting, it reports its decisions in the console. Make sure all features you need are detected and make sure (e.g. with dependency walker) the resulting library has similar dependencies as the original one. When you run your program, make sure all dependencies of your libraries are matched.

[kito]

how do i deploy qt application from ubuntu to run on windows(cross compiling):\?

[sn00p]

While configure.exe runs, it auto-detects features available on your system and builds Qt according to those. After detecting, it reports its decisions in the console. Make sure all features you need are detected and make sure (e.g. with dependency walker) the resulting library has similar dependencies as the original one. When you run your program, make sure all dependencies of your libraries are matched.

Thanks.

The problem was actually the compiler, once I switched to using the compiler that came with the pre-built SDK, I was able to build a Qt from source that actually worked. I used the same settings that the binary SDK version was compiled with.

Once I was able to build a version of Qt from source that worked (i.e I could drop in the Qt DLL's over my old ones) I was then able to apply the necessary patches to QtNetwork to hopefully fix the issues with NTLM authentication.

Thanks for your help

Adrian