Multithreaded build with QtCreator in Windows
Hi, everybody!
Recently I have faced with a problem of realization of multithreaded build in Qt Creator 2.0 in Windows. I found thread in Qt-creator mailing list which says, that the flag “-jx”, specified in make params in Qt Creator, in Windows doesn’t work, because “The problem seems to be that child processes don’t get the parent arguments (as on Linux).”
But time – the most valuable resource and I don’t want to spend it for recompilation at debugging and refactoring, I found a solution. The main idea is to run mingw32-make from .bat-file with the necessary parameters.
First of all we must set environment variable with path to mingw and specify include/lib folders (if they doesn’t set by default)
Then we call mingw32-make.exe with following parameters:
-j4 — set number of jobs/threads to 4
-C % CD% — change to project dir before doing anything. “% CD%” sets automaticaly by Qt Creator
!!!remove space between % and CD. I used it because parser translate them as one symbol
-f Makefile.%1 — I used standard Debug/Release targets in QtCreator, so qmake creates two makefiles: Makefile.Debug and Makefile.Release. %1 – first argument which recieve build target name
Further in the “Build steps” section in the “Override make.exe” field in QtCreator we must specify path to our .bat-file. (e.g. C:\make.bat) and in the “make arguments” field we must specify target name.
We must set “Override make.exe” and make params in all build targets!
My .bat-file code:
Don’t forget to remove space between % and CD!
Paths to mingw can differ.
6 replies
Is there anything to build in parallel? Jom works fine for me, using up to 30 jobs in parallel to build creator.
You did add -j X as additional argument to the make step, didn’t you? Does the build step configuration mention using jom? What are you trying to build? I assume your build supports more than one job at a time (otherwise your bat file would not have worked either).
I tried to build adressbook sample with -j X argument, but still only one build thread.
Build step configuration by default contains only qmake and mingw32-make, there is no jom mentions.
-j 4 added to make arguments and make line is “Make: mingw32-make.exe -j 4 -w in C:\Qt\2010.04\qt\examples\itemviews\addressbook-build-desktop”
“Use jom instead nmake” surely checked
But multithreaded build works fine via .bat
Windows XP Sp3
jom 0.8.3
QtCreator 2.0.0 Built on Jun 21 2010 at 01:56:06 From revision 1c0f52a091
Hmm… jom will replace nmake. So it is only relevant form MSVC based builds. The mingw make already supports -j X fine.
So are you using MSVC builds? I just assumed you did since mingw-make should woirk without the bat-file:-)
Please check the details of the make step: Are you overriding the make command there? If you do not then jom should be used for MSVC-based projects. You still need to provide the additional -j X parameter in additional parameters (both for jom and mingw-make).
Oh, yeah.. jom override nmake and nmake it’s msvc make app, I forgot it. But I used mingw based builds and -j X doesn’t work for me.. I just try to build project with Qt for symbian (msvc) and it works fine with jom
Post from Qt-creator mailing list in which mentioned the same problem (Aug. 2009): http://lists.trolltech.com/pipermail/qt-creator/2009-August/004152.html [lists.trolltech.com]
UPD: By the way on Ubuntu -j X argument works fine
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