Saturday, December 1, 2012

Compiling Qt for visual studio 2012 - windows 8

Download Qt 4.8.4 from here
Download Perl from here
Download JOM from

1. Install Perl, which we downloaded

2. Extract the Qt src file (zip file) to C:/Qt

3. Qt 4.8.4 has problem compiling the webkit module so we have to replace
C:\Qt\src\3rdparty\webkit\Source\JavaScriptCore\wtf\HashSet.h with this HashSet.h 
4. Extract JOM to C:/Qt/jom

5. Set up the environment variables for Qt

6. Update PATH variable to  %QTDIR%\bin
add ';' to the end of the path and then append %QTDIR%\bin

7.Open VS2012 Native tools command line and move to C:\Qt

cd C:\Qt
8.Then type 
configure -opensource -platform win32-msvc2012
9. Then type
jom\jom.exe -j n
where n is the number of cores of your CPU.For me its ( jom\jom.exe -j 2 )

Compilation usually takes 5 - 6 hours 


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  4. with the same steps i got this error when compiling

    C:\Qt\4.8.5.src\src\3rdparty\javascriptcore\JavaScriptCore\wtf/MathExtras.h(103) : error C2491: 'round' : definition of dllimport function not allowed
    C:\Qt\4.8.5.src\src\3rdparty\javascriptcore\JavaScriptCore\wtf/MathExtras.h(110) : error C2491: 'roundf' : definition of dllimport function not allowed
    C:\Qt\4.8.5.src\src\3rdparty\javascriptcore\JavaScriptCore\wtf/MathExtras.h(128) : error C2084: function 'bool signbit(double)' already has a body
    C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\math.h(324) : see previous definition of 'signbit'
    c:\qt\4.8.5.src\src\3rdparty\javascriptcore\javascriptcore\runtime\JSValue.h(615) : error C2264: 'signbit' : error in function definition or declaration; function not called
    c:\qt\4.8.5.src\src\3rdparty\javascriptcore\javascriptcore\runtime\JSValue.h(696) : error C2264: 'signbit' : error in function definition or declaration; function not called

  5. You are trying to compile Qt 4.8.5 which is not compatible with VS2012 => Please take more attention of what is written.

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