DEAN LEE:/DEV/BLOG » VC 2008 http://www.deanlee.cn mount /dev/brain || tail -f /var/log/thoughts >> /pub/www Tue, 27 Jul 2010 05:21:25 +0000 en hourly 1 http://wordpress.org/?v=3.0 QT/VC2008:Project is rebuilt every time even though I didn’t make any modifications http://www.deanlee.cn/programming/qt_vc_project_is_out_of_date/ http://www.deanlee.cn/programming/qt_vc_project_is_out_of_date/#comments Tue, 08 Sep 2009 04:24:10 +0000 Dean Lee http://www.deanlee.cn/technology/qt_vc_project_is_out_of_date/
  • Compile with /MP flag on my system
    • ]]>     I have encountered problem when attempting to compile VC projects created by QT 4.5.2,VC always rebuilds the whole project when I start to run or build the project, even though I didn’t make any modifications to the code.the project is always “out of date”.

    that is because the custom build step generated by QT for each header files that contain the Q_OBJECT macro are dependent on mocinclude.tmp,which being created every time the project is built,the mocinclude.tmp’s date is later than the header files,so the custom build rule will be run every time.

    to solve this problem,open %QTDIR%/makespecs/features/moc.prf,comment out  these two lines(add ‘#’’ at the start of line):

    !isEmpty(INCLUDETEMP):moc_source.depends += $$INCLUDETEMP
......
!isEmpty(INCLUDETEMP):moc_header.depends += $$INCLUDETEMP

    and run qmake –tp vc again to regenerate the project files.

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    1. Compile with /MP flag on my system

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