How to speed up Qt Windows Vc Build

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Using /MP[processMax] option

More information about /MP[processMax] option "here":http://msdn.microsoft.com/en-us/library/bb385193.aspx. Just add this flag to your spec file (%QIDIR%/mkspecs/win32-msvc*/qmake.conf).

processMax argument:

  • (Optional) The maximum number of processes that the compiler can create.
  • The processMax argument must range from 1 through 65536. Otherwise, the compiler issues warning message D9014, ignores the processMax argument, and assumes the maximum number of processes is 1.
  • If you omit the processMax argument, the compiler retrieves the number of effective processors on your computer from the operating system, and creates a process for each processor.

Example: /MP2 (for dual core), /MP4 (for quad core)…

Using jom

In linux we do speed up with make -j4 or something like this. There is similar tool developed called jom, it can be downloaded from git "here":http://qt.gitorious.org/qt-labs/jom.

See also "jom's wiki page":jom

Precompiled packages can be found "here":http://get.qt.nokia.com/jom/.

The original announcement of jom can be found "here":http://labs.qt.nokia.com/2009/03/27/speeding-up-visual-c-qt-builds/: