How to compile on multiple cores using mingw inside QTCreator

Question

I have a quad-core i7 CPU on my windows desktop. I am trying to get mingw32-make to compile using as many core as possible. I have added -j8 into the \"Make Arguments\" fiel

Answer 1

Add -j9 (replace 9 to value of NUMBER_OF_PROCESSORS(Windows)/$(nproc)(Linux) plus one — this is optimal) to all

QString makefilein = " -f " + subtarget->makefile;

lines in qmake\generators\makefile.cpp (find it yourself).

It results as

QString makefilein = " -j9 -f " + subtarget->makefile;

then run configure.exe with proper parametres (!and additional -qmake -dont-process to avoid generation abundance of makefiles!).

The problem is that you get two sets of processes during "debug and release" build. Thereby, total count of processes spawned is 18+.