Cannot cross compile Bitcoin 0.18 for windows because of QT

[TheWolf666]

I try to compile Bitcoin 0.18 for windows, from an Ubuntu Mate 0.18.2
When I compile the dependencies, I get this error.
The QT wallet cannot be compiled in consequence. Any workaround?

Code:

checking QtPlugin usability... no
checking QtPlugin presence... no
checking for QtPlugin... no
configure: WARNING: QtCore headers missing; bitcoin-qt frontend will not be built

[DaCryptoRaccoon]

Code:

set PATH=%PATH%;C:\Qt\5.11.1\bin
cd C:\coin folder name
qmake USE_UPNP=- coinname-qt.pro
mingw32-make -f Makefile.Release

Looks like QT5 is missing..

This topic might be of some help to you..

https://bitcointalk.org/index.php?topic=149479.1140

https://download.qt.io/archive/qt/5.11/5.11.1/

[TheWolf666]

Hum, I am cross compiling on Ubuntu, not on Windows...
QT5 is installed, but the PATH is maybe not updated. I will investigate that, thanks for your answer.

Code:

set PATH=%PATH%;C:\Qt\5.11.1\bin
cd C:\coin folder name
qmake USE_UPNP=- coinname-qt.pro
mingw32-make -f Makefile.Release

Looks like QT5 is missing..

This topic might be of some help to you..

https://bitcointalk.org/index.php?topic=149479.1140

https://download.qt.io/archive/qt/5.11/5.11.1/

[pereira4]

Hum, I am cross compiling on Ubuntu, not on Windows...
QT5 is installed, but the PATH is maybe not updated. I will investigate that, thanks for your answer.

Code:

set PATH=%PATH%;C:\Qt\5.11.1\bin
cd C:\coin folder name
qmake USE_UPNP=- coinname-qt.pro
mingw32-make -f Makefile.Release

Looks like QT5 is missing..

This topic might be of some help to you..

https://bitcointalk.org/index.php?topic=149479.1140

https://download.qt.io/archive/qt/5.11/5.11.1/

Uninstall and reinstall:

Code:

sudo apt autoremove '.*qt5.*-dev'
sudo apt autoremove '.*qt4.*-dev'

Then reinstall:

Code:

wget http://download.qt.io/official_releases/qt/5.7/5.7.0/qt-opensource-linux-x64-5.7.0.run
chmod +x qt-opensource-linux-x64-5.7.0.run
./qt-opensource-linux-x64-5.7.0.run

but install qt4 first then qt5

[achow101]

Are you using the depends system? You should be as the system libraries will not be built for Windows so cross compile won't work with the system libs.

[TheWolf666]

I have solved the problem. Bitcoin apparently does not use the 'normal' QT dev install, so you really need to compile QT5 from the depends.
If there is a problem with the depend compilation (for example one of the sha256 flavor is doing an error), the depends compilation is stopping, before QT5 was installed (it is compiled close to the end).
I didn't noticed the error and though the depends were totally finished.

make -i solved the problem, the compilation of the depends jumped over the failed compilation and finished correctly.

Btw, it is also working to backup the depend folder or copy from one folder to another. Bitcoin configuration is all relative to the depends/ folder, so what I am doing to save the time to re-compile the depends is to zip the depends folder for each version of Bitcoin and unzip them after cloning the repository, it is working and is fast!

Another interesting thing is that the depends folder can also be copied into a fork of Bitcoin (altcoin) and it is working - assuming that the versions are matching of course.