How much time will it take to build Qt 5.15.x source package

[aha_1980]

@Rajdeep100 said in How much time will it take to build Qt 5.15.x source package:

Hey guys,
The compilation process just got completed after posting this thread!!
it took exactly 2 hours to build.

You do know that you have to give -j <cores> to the make command to use all your cores, do you?

Regards

[Rajdeep100]

@aha_1980 Yes I did

[Rajdeep100]

@sierdzio Ohhh, I got it. Thanks!!

[KH-219Design]

@J-Hilk already hinted at the following, but I will state it more concretely...

If you do not need every Qt5 library that exists, you can speed this up significantly by only building the subset of libraries you need.

I habitually build Qt5 from source using variations of this script: https://github.com/219-design/build_qt_binaries/blob/09ad9369c8ab/script.sh

(The script as linked above is hardcoded to build v5.14.0 but that is easy to change.)

The script constrains the subset of libraries in two (possibly redundant) ways:

First, not all submodules are downloaded:

git clone git://code.qt.io/qt/qt5.git qt5_sources
cd qt5_sources

git checkout v5.14.0
git submodule update --init --recursive  \
    qtbase \
    qtcharts \
    qtdeclarative \
    qtgraphicaleffects \
    qtimageformats \
    qtmultimedia \
    qtquickcontrols \
    qtquickcontrols2 \
    qtquicktimeline \
    qtscript \
    qtsvg \
    qttools \
    qttranslations \
    qtvirtualkeyboard \
    qtx11extras \
    qtxmlpatterns

(Refer to: https://github.com/219-design/build_qt_binaries/blob/09ad9369c8ab/script.sh#L34)

Second, I pass a number of explicit -skip arguments to configure:

  ../../qt5_sources/configure \
      -prefix "${PWD}/../../qt5_${BUILDTYPE}_install" \
      -opensource -confirm-license \
      -c++std c++17 \
      ${CONFIG_ARGS} \
      -sysroot / \
      -no-pch \
      -pkg-config \
      -qt-libpng \
      -qt-zlib \
      -skip qt3d \
      -skip qtactiveqt \
      -skip qtandroidextras \
      -skip qtcanvas3d \
      -skip qtconnectivity \
      -skip qtdatavis3d \
      -skip qtdoc \
....  and so forth .....

(Refer to: https://github.com/219-design/build_qt_binaries/blob/09ad9369c8ab/script.sh#L85)

I have a similar workstation to yours, and I have been using Ubuntu 18 for most of my builds, and I never wait more than about 30 minutes for a build to finish of my chosen subset of Qt libs.

[JonB]

@KH-219Design said in How much time will it take to build Qt 5.15.x source package:

never wait more than about 30 minutes for a build to finish of my chosen subset

Given your "30 minutes", do you have any comparison timing if you had not skipped those 30 modules? OOI.

[KH-219Design]

@JonB said in How much time will it take to build Qt 5.15.x source package:

@KH-219Design said in How much time will it take to build Qt 5.15.x source package:

never wait more than about 30 minutes for a build to finish of my chosen subset

Given your "30 minutes", do you have any comparison timing if you had not skipped those 30 modules? OOI.

@JonB that's a great question. I don't have such fine-grained info, but it would be fun to measure it sometime. I wonder if anyone has tried to tabulate approximate or relative build time on a library-by-library granularity...

[JonB]

@KH-219Design
I just wanted to know how long a full build would take you in comparison. I have never compiled Qt, partly on the (fairly safe) assumption that it would take me forever... ;-)

[KH-219Design]

@JonB well based on what @Rajdeep100 said above, I think it's safe to say it takes no less than 2 full hours :)

(But we still don't know if @Rajdeep100 was limiting the quantity of libs in any way.)

[Rajdeep100]

I'm really tired of compiling it from source, do you know how to setup different repositories for the online Qt installer??

[aha_1980]

Hi @Rajdeep100,

please see my answer to your question at https://forum.qt.io/topic/119034/what-is-the-release-date-for-qt-5-15-1-offline-installer-for-linux/4