Changing compiler in Qt

How to change compiler (GCC) in Qt? I've installed GCC 4.4 and 4.6. At the momment Qt uses 4.4 but I'd like i开发者_运维技巧t to use 4.6. How to do it?

In the build sequence it may have a qmake command like qmake YourProject.pro -r -spec linux-g++-64 the choice of the tool chain is done in the spec file here linux-g++-64. Your will find this file in path-to-the-sdk/qt/mkspecs/linux-g++-64 (you get the concept right?)... If you open the spec file you will see that it includes the linux spec and the g++ spec.

One solution is to copy the g++ spec file and rename it g++-4.6 for example edit it and change :

QMAKE_CC = gcc
QMAKE_CXX = g++

to :

QMAKE_CC = gcc-4.6 
QMAKE_CXX = g++-4.6

Idem for the linux-g++-64 it can be copied to linux-g++-4.6-64 and modify the include(...) command to include your new g++-4.6 file.

Finally build your project with qmake YourProject.pro -r -spec linux-g++-4.6-64.

I hope it's clear :) ...

I realise I am very late for the party but on Linux it is as simple as follows:

qmake -makefile <your-project.pro> -spec linux-clang

On my system, all sorts of different mkspecs are available at:

/usr/lib/x86_64-linux-gnu/qt5/mkspecs

Running make CC=my-custom-gcc CXX=my-custom-g++ LINK=my-custom-g++ seems to do the trick for me. But it might not be 100% safe (i.e. I wouldn't be surprised if running qmake with Linux specs and then specifying mingw32 compilers would fail).

If you are using Qt Creator 2.2.0, you can try Tools > Options > Tool Chains and then Add > MinGW.