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

Rajdeep100

Hello there,
This is my first time compiling the source package and it's been over 2hrs and still compiling.
Anybody knows how much time will it take to complete??

System Info,
Memory - 8GB,
Processor - Intel® Core™ i5-7200U CPU @ 2.50GHz × 4,
Disk - 240GB SSD,
OS - Ubuntu 20.04.1 LTS.

Thank-You for your time!!

J.Hilk

@Rajdeep100 hard to tell, especially without us knowing your configure and make call.

That said, compiling complete Qt without tests and examples takes (for me) somewhere between 2 and 8 hours, depending on OS, target and Host-PC

Rajdeep100

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

But do you know how do I launch QtCreator from bin folder, there are so many files,

balsam qmake qmlpreview repc
canbusutil qml qmlprofiler syncqt.pl
fixqt4headers.pl qmlcachegen qmlscene tracegen
meshdebug qmleasing qmltestrunner uic
moc qmlformat qmltyperegistrar xmlpatterns
qdbuscpp2xml qmlimportscanner qscxmlc xmlpatternsvalidator
qdbusxml2cpp qmllint qtwaylandscanner
qgltf qmlmin qvkgen
qlalr qmlplugindump rcc

which one to execute in order to launch qtcreator??
thank-you for reading my post!!

SGaist

Hi and welcome to devnet,

None of them. Qt Creator is a much younger and separate project. If you want to build it you have to clone the corresponding repository.

Rajdeep100

@SGaist So, If I cloned it from GitHub and repeated the whole process again, will there be any file by which I can launch QtCreator?

Or is there any offline installers for Qt 5.15.1??

sierdzio

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

@SGaist So, If I cloned it from GitHub and repeated the whole process again, will there be any file by which I can launch QtCreator?

You are compiling Qt. That source code does not contain Qt Creator at all. Qt Creator is a separate project, with separate repository. You can get QtC source code from here

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