Installation and Deployment

No, you can use your distribution provided Qt. However it's a good idea to keep in sync with the version you are going to use to cross-compile. From the looks of it, you tried to use your cross-compiled Qt with your desktop compiler. Hence your error.

@Aronax said in How to check OpenGL version?: Are there any QT functions to do that? I just want to point out, that I am not using OpenGL by my selft programmatically. I just simply use Qt Quick Controls 2. AFAIK, there is no function in Qt to give you the OpenGL version. I've never tried this, but you could play around with QOpenGLFunctions and see if you can deduce the version by calling its functions (maybe some feature is not available in OpenGL <2.0, or maybe some function calls will fail): https://doc.qt.io/qt-5/qopenglfunctions.html#openGLFeatures

Same crash callstack on Qt 5.5 and Qt 5.6 under VS 2008 and VS 2017. Solution is to use QT_PLUGIN_PATH instead of QT_QPA_PLATFORM_PLUGIN_PATH.

I used the solution that user "texas" suggested 7 years ago - it worked. I'll just add the nitty-gritty details of what I did... I had the same problem on Windows 7. How I solved this: I open QT Creator. I select menu-option [Tools] From there I select [Options...] From there I select the [Kits] option on the left-hand side I select the tab [QT Versions] I click The [Add...] button: to add the QT version that I am using... ... I am presented with a windows-explorer screen to select something... ... I go to the main directory on which QT is installed (in my case: C:\Qt)... ... In the explorer "Search" I enter 'qmake' (without the quotes)... ... There is a single 'qmake.exe' file displayed - I double-click it!... ... I press [Apply], then [OK]. Walla - it works! I now have examples!

Basically, my question is not "why it's happened" by hoц to set option -O1 in one Qt module ( in QtGUI ) legally. Now i have to hack way I need to build all qtbase-everywhere-src-5.11.2 library as is, than correct QtGui/makefile.Release with replacing all -O2 to -O1 Then for QtGui make clean make make install It's too long way to success :) Any ideas ???

I have included the import statement. I have my project being built two ways. I have it setup as using shared libs while debugging so I have a kit that is set up for that using the default qt install. I then have a static kit that I use for release. When I run the debug it loads fine, I get no errors. When I switch to the release kit I then get the error that you posted about an unknown component. Here is my qml file import QtQuick 2.12 import QtQuick.Window 2.12 import QtQuick.Extras 1.4 import QtQuick.Controls.Styles 1.4 Window { visible: true width: 640 height: 480 title: qsTr("Hello World") CircularGauge { id: gauge width: 400 height: 400 antialiasing: true tickmarksVisible: true anchors.horizontalCenter: parent.horizontalCenter anchors.verticalCenter: parent.verticalCenter value: 0 minimumValue: -100 maximumValue: 100 style: CircularGaugeStyle { minorTickmarkCount: 0 needle: Rectangle { y: outerRadius * 0.15 implicitWidth: outerRadius * 0.03 implicitHeight: outerRadius * 0.9 antialiasing: true color: Qt.rgba(0.66, 0.3, 0, 1) } } } } I just used the basic Qt Quick Application - Empty template for the project and only added CONFIG += static to the .pro file For some reason it's not finding the Controls.Styles using the static build. If I mouse over the import statement it reads 'Library at C:/Qt/Static/5.12.3/qml/QtQuick/Controls/Styles'.

Hi and welcome to devnet, You need to provide more information: What version of Qt did you install ? What version of the NDK ? What version of the SDK ? How did you install both of them ?

Are you referring to Microsoft ".CHM" help files? They are in a different format than the Qt ".QCH" files, and are not compatible.

@Venkatesan-Soundirarajan can you try to rename the function resolveSymbols in these two plugins, so that the names become unique? That is my only idea for now. Regards

I changed NDK to r10e, and I read this guide but the problem is still appearing :( Could anyone explain me how to use fixed GDB build from Qt downloads?

Hi, That's not how library handling usually works on Linux. What is your use case ?

i installed all these dependent rpms :- 1:libgcc-4.8.5-36.el7 ################################# [ 1%] 2:libverto-devel-0.2.5-4.el7 ################################# [ 2%] 3:pcre-devel-8.32-17.el7 ################################# [ 2%] 4:nss-softokn-freebl-3.34.0-2.el7 ################################# [ 3%] 5:glibc-common-2.17-260.el7 ################################# [ 4%] 6:glibc-2.17-260.el7 ################################# [ 5%] 7:nspr-4.17.0-1.el7 ################################# [ 5%] 8:nss-util-3.34.0-2.el7 ################################# [ 6%] 9:libsepol-2.5-10.el7 ################################# [ 7%] 10:libstdc++-4.8.5-36.el7 ################################# [ 8%] 11:pcre-8.32-17.el7 ################################# [ 9%] 12:libselinux-2.5-14.1.el7 ################################# [ 9%] 13:libcom_err-1.42.9-13.el7 ################################# [ 10%] 14:zlib-1.2.7-18.el7 ################################# [ 11%] 15:nss-pem-1.0.3-4.el7 ################################# [ 12%] 16:nss-3.34.0-4.el7 ################################# [ 13%] 17:nspr-devel-4.17.0-1.el7 ################################# [ 13%] 18:libitm-4.8.5-28.el7 ################################# [ 14%] 19:nss-util-devel-3.34.0-2.el7 ################################# [ 15%] 20:opencryptoki-libs-3.7.0-1.el7 ################################# [ 16%] 21:libcom_err-devel-1.42.9-13.el7 ################################# [ 16%] 22:nss-tools-3.34.0-4.el7 ################################# [ 17%] 23:glib2-2.56.1-2.el7 ################################# [ 18%] 24:zlib-devel-1.2.7-18.el7 ################################# [ 19%] 25:nspr-4.19.0-1.el7_5 ################################# [ 20%] 26:sqlite-3.7.17-8.el7 ################################# [ 20%] 27:nss-util-3.36.0-1.el7_5 ################################# [ 21%] 28:libsepol-devel-2.5-10.el7 ################################# [ 22%] 29:libselinux-devel-2.5-14.1.el7 ################################# [ 23%] 30:nss-softokn-freebl-3.34.0-2.el7 ################################# [ 23%] 31:nss-softokn-freebl-devel-3.34.0-2################################# [ 24%] 32:bzlib-1:1.0.6-alt6 ################################# [ 25%] 33:daxctl-libs-62-1.el7 ################################# [ 26%] 34:lz4-1.7.5-2.el7 ################################# [ 27%] 35:perl-Newt-1.08-36.el7 ################################# [ 27%] 36:perl-WWW-Curl-4.15-13.el7 ################################# [ 28%] 37:nss-softokn-freebl-devel-3.34.0-2################################# [ 29%] 38:nspr-4.17.0-1.el7 ################################# [ 30%] 39:nss-util-3.34.0-2.el7 ################################# [ 30%] 40:keyutils-libs-1.5.8-3.el7 ################################# [ 31%] 41:krb5-libs-1.15.1-34.el7 ################################# [ 32%] 42:openssl-libs-1:1.0.2k-12.el7 ################################# [ 33%] 43:cyrus-sasl-lib-2.1.26-23.el7 ################################# [ 34%] 44:openldap-2.4.44-13.el7 ################################# [ 34%] 45:libitm-4.8.5-28.el7 ################################# [ 35%] 46:openssl-libs-1:1.0.2k-12.el7 ################################# [ 36%] 47:keyutils-libs-devel-1.5.8-3.el7 ################################# [ 37%] 48:krb5-devel-1.15.1-18.el7 ################################# [ 38%] 49:opencryptoki-libs-3.7.0-1.el7 ################################# [ 38%] 50:ncurses-libs-5.9-14.20130511.el7_################################# [ 39%] 51:libdb-5.3.21-24.el7 ################################# [ 40%] 52:cyrus-sasl-lib-2.1.26-23.el7 ################################# [ 41%] 53:libuuid-2.23.2-59.el7 ################################# [ 41%] 54:libitm-devel-4.8.5-28.el7 ################################# [ 42%] 55:opencryptoki-icsftok-3.7.0-1.el7 ################################# [ 43%] 56:libkadm5-1.15.1-34.el7 ################################# [ 44%] 57:openssl-1:1.0.2k-12.el7 ################################# [ 45%] 58:libblkid-2.23.2-59.el7 ################################# [ 45%] 59:readline-6.2-10.el7 ################################# [ 46%] 60:sqlite-3.7.17-8.el7 ################################# [ 47%] 61:nss-softokn-3.34.0-2.el7 ################################# [ 48%] 62:nss-softokn-devel-3.34.0-2.el7 ################################# [ 48%] 63:nss-pem-1.0.3-4.el7 ################################# [ 49%] 64:nss-3.34.0-4.el7 ################################# [ 50%] 65:openldap-2.4.44-13.el7 ################################# [ 51%] 66:libgpg-error-1.12-3.el7 ################################# [ 52%] 67:libgcrypt-1.5.3-14.el7 ################################# [ 52%] 68:xz-libs-5.2.2-1.el7 ################################# [ 53%] 69:cyrus-sasl-2.1.26-23.el7 ################################# [ 54%] 70:cyrus-sasl-devel-2.1.26-23.el7 ################################# [ 55%] 71:openldap-servers-2.4.44-13.el7 ################################# [ 55%] 72:krb5-libs-1.15.1-37.el7_6 ################################# [ 56%] 73:openssl-libs-1:1.0.2k-16.el7 ################################# [ 57%] 74:sslscan-1.10.2-3.el7 ################################# [ 58%] 75:krb5-devel-1.15.1-18.el7 ################################# [ 59%] 76:openssl-devel-1:1.0.2k-12.el7 ################################# [ 59%] 77:openssl-devel-1:1.0.2k-12.el7 ################################# [ 60%] 78:cracklib-2.9.0-11.el7 ################################# [ 61%] 79:elfutils-libelf-0.172-2.el7 ################################# [ 62%] 80:elfutils-libs-0.172-2.el7 ################################# [ 63%] 81:libattr-2.4.46-13.el7 ################################# [ 63%] 82:libcap-2.22-9.el7 ################################# [ 64%] 83:libcap-ng-0.7.5-4.el7 ################################# [ 65%] 84:audit-libs-2.8.4-4.el7 ################################# [ 66%] 85:pam-1.1.8-22.el7 ################################# [ 66%] 86:cyrus-sasl-2.1.26-23.el7 ################################# [ 67%] 87:cyrus-sasl-devel-2.1.26-23.el7 ################################# [ 68%] 88:lz4-1.7.5-2.el7 ################################# [ 69%] 89:openldap-devel-2.4.44-13.el7 ################################# [ 70%] 90:openssl-static-1:1.0.2k-12.el7 ################################# [ 70%] 91:openssl-devel-1:1.0.2k-16.el7 ################################# [ 71%] 92:openssl-static-1:1.0.2k-12.el7 ################################# [ 72%] 93:tlssled-1.3-4.el7 ################################# [ 73%] 94:libkadm5-1.15.1-37.el7_6 ################################# [ 73%] 95:openldap-servers-sql-2.4.44-13.el################################# [ 74%] 96:openldap-devel-2.4.44-13.el7 ################################# [ 75%] 97:cryptsetup-libs-2.0.3-3.el7 ################################# [ 76%] 98:nss-devel-3.34.0-4.el7 ################################# [ 77%] 99:nss-devel-3.34.0-4.el7 ################################# [ 77%] 100:sqlite-devel-3.7.17-8.el7 ################################# [ 78%] 101:openssl-perl-1:1.0.2k-12.el7 ################################# [ 79%] 102:krb5-devel-1.15.1-34.el7 ################################# [ 80%] 103:opencryptoki-3.7.0-1.el7 ################################# [ 80%] 104:libitm-static-4.8.5-28.el7 ################################# [ 81%] 105:libitm-static-4.8.5-28.el7 ################################# [ 82%] 106:opencryptoki-devel-3.7.0-1.el7 ################################# [ 83%] 107:openldap-clients-2.4.44-13.el7 ################################# [ 84%] 108:crypto-utils-2.4.1-42.el7 ################################# [ 84%] 109:lz4-devel-1.7.5-2.el7 ################################# [ 85%] 110:ndctl-libs-62-1.el7 ################################# [ 86%] 111:nss-softokn-devel-3.34.0-2.el7 ################################# [ 87%] 112:sqlite-devel-3.7.17-8.el7 ################################# [ 88%] 113:gamin-0.1.10-16.el7 ################################# [ 88%] 114:glib2-devel-2.56.1-2.el7 ################################# [ 89%] 115:opencryptoki-devel-3.7.0-1.el7 ################################# [ 90%] 116:libitm-devel-4.8.5-28.el7 ################################# [ 91%] 117:nss-util-devel-3.34.0-2.el7 ################################# [ 91%] 118:nspr-devel-4.17.0-1.el7 ################################# [ 92%] 119:systemd-libs-219-62.el7 ################################# [ 93%] 120:device-mapper-7:1.02.149-8.el7 ################################# [ 94%] 121:device-mapper-libs-7:1.02.149-8.e################################# [ 95%] 122:parted-3.1-29.el7 ################################# [ 95%] 123:opencryptoki-icsftok-3.7.0-1.el7 ################################# [ 96%] 124:libmount-2.23.2-59.el7 ################################# [ 97%] 125:opencryptoki-3.7.0-1.el7 ################################# [ 98%] 126:nss-softokn-freebl-3.36.0-5.el7_5################################# [ 98%] 127:libffi-3.0.13-18.el7 ################################# [ 99%] 128:libverto-0.2.5-4.el7 ################################# [100%] and after running qmake and make like this:- [root@centos75client mysql]# /opt/Qt/5.7/gcc_64/bin/qmake "INCLUDEPATH+=/usr/include" "LIBS+=-L/usr/lib64/mysql -lmysqlclient_r -lrt -ldl -lssl -lcrypto" mysql.pro [root@centos75client mysql]# make rm -f libqsqlmysql.so g++ -Wl,--no-undefined -Wl,-O1 -Wl,--enable-new-dtags -Wl,-z,origin -Wl,-rpath,\$ORIGIN/../../lib -Wl,-rpath,\$ORIGIN/../../lib -shared -o libqsqlmysql.so .obj/main.o .obj/qsql_mysql.o .obj/moc_qsql_mysql_p.o -L/usr/lib64/mysql -lrt -ldl -lmysqlclient_r -lz -lcrypt -lnsl -lm -lssl -lcrypto -L/opt/Qt/5.7/gcc_64/lib -lQt5Sql -lQt5Core -lpthread mv -f libqsqlmysql.so ../../../../plugins/sqldrivers/ [root@centos75client mysql]# make install install -m 755 -p ../../../../plugins/sqldrivers/libqsqlmysql.so /opt/Qt/5.7/gcc_64/plugins/sqldrivers/libqsqlmysql.so strip --strip-unneeded /opt/Qt/5.7/gcc_64/plugins/sqldrivers/libqsqlmysql.so install -m 644 -p /opt/Qt/5.7/Src/qtbase/lib/cmake/Qt5Sql/Qt5Sql_QMYSQLDriverPlugin.cmake /opt/Qt/5.7/gcc_64/lib/cmake/Qt5Sql/ and mysql plugin installed thanks alot

Hi, I checked the MD5 sum for the downloaded offline installer. It was corrupt. Downloaded new file and it installed without problems. Problem solved.

@BKBK What is the policy of your government/cyber security group regarding usage of open source software? "Being open source does not guarantee that someone has closely examined all the code for malware" - correct, but without source code there is guarantee that nobody outside the company writing the code examined the source code :-) From my point of view organisations concerned about security should either use open source (to be able to check source code) or have special agreements with companies to be able to check source code from closed source software.

I found in sources of QtIFW class EnvironmentVariableOperation, that implement functions "performOperation" and "UndoOperation" for installation and uninstallation steps, but still not clear why errors appear

Hi and welcome to devnet, One maybe simpler way to do that would be to open the module in Qt Creator and build it using the Android Kit.

Sure. It was a mistake using static QSqlDatabase object, because only fail at the deployment. Thanks guys.

@Guigiidre If you want to publish for WinRT why don't you want to rebuild it for WinRT? That would be the clean solution and not some hacks with Desktop bridge.

Hi, Any chances that you had a Windows update in between ? A graphic card driver update ?