<![CDATA[Undefined error 'undefined reference to `_imp___ZN12QApplicationC1ERiPPci'"]]>I am new to QT, I am currently using QT creator 5.7 and QT 4.0.2 . I tried building the Hello world simple application using QT widgets. below is the code in .pro

QT += core gui

QMAKE_CXXFLAGS += -std=c++11

greaterThan(QT_MAJOR_VERSION,4):QT += widgets

SOURCES +=
main.cpp

All librarly is getting included while compiling, I am not sure why Undefined error is thrown. Please help to understand this issue

]]>https://forum.qt.io/topic/73710/undefined-error-undefined-reference-to-_imp___zn12qapplicationc1erippciRSS for NodeSun, 03 May 2026 19:35:39 GMTFri, 25 Nov 2016 09:39:57 GMT60<![CDATA[Reply to Undefined error 'undefined reference to `_imp___ZN12QApplicationC1ERiPPci'" on Fri, 25 Nov 2016 10:56:16 GMT]]>Hi
" currently installed QT5.7 for Windows and the compiler I installed is GCC 4.9.1"

Something NOT right. GCC= mingw ?
Normally Qt comes with mingw compiler (on windows) and no extra installes needed.
This one has all working out of the box
https://download.qt.io/archive/qt/5.7/5.7.0/qt-opensource-windows-x86-mingw530-5.7.0.exe

]]>https://forum.qt.io/post/361607https://forum.qt.io/post/361607Fri, 25 Nov 2016 10:56:16 GMT<![CDATA[Reply to Undefined error 'undefined reference to `_imp___ZN12QApplicationC1ERiPPci'" on Fri, 25 Nov 2016 10:13:40 GMT]]>Hi

I tried , current Virus scanning is not running. I am getting the same issue

]]>https://forum.qt.io/post/361593https://forum.qt.io/post/361593Fri, 25 Nov 2016 10:13:40 GMT<![CDATA[Reply to Undefined error 'undefined reference to `_imp___ZN12QApplicationC1ERiPPci'" on Fri, 25 Nov 2016 09:55:55 GMT]]>@Mathivalavan If you have any anti virus software running disable it and try again

]]>https://forum.qt.io/post/361587https://forum.qt.io/post/361587Fri, 25 Nov 2016 09:55:55 GMT<![CDATA[Reply to Undefined error 'undefined reference to `_imp___ZN12QApplicationC1ERiPPci'" on Fri, 25 Nov 2016 09:54:49 GMT]]>Hi

I am currently installed QT5.7 for Windows and the compiler I installed is GCC 4.9.1 for QT. I got this from the QT links

]]>https://forum.qt.io/post/361586https://forum.qt.io/post/361586Fri, 25 Nov 2016 09:54:49 GMT<![CDATA[Reply to Undefined error 'undefined reference to `_imp___ZN12QApplicationC1ERiPPci'" on Fri, 25 Nov 2016 09:51:28 GMT]]>Ok
Something wrong with your install.

Qt 4.02 is extremely old. :)

Windows or linux?

]]>https://forum.qt.io/post/361584https://forum.qt.io/post/361584Fri, 25 Nov 2016 09:51:28 GMT<![CDATA[Reply to Undefined error 'undefined reference to `_imp___ZN12QApplicationC1ERiPPci'" on Fri, 25 Nov 2016 09:49:21 GMT]]>Hi

I tried that, and shows the error "error: [ui_widget.h] Error -1073741515"

]]>https://forum.qt.io/post/361580https://forum.qt.io/post/361580Fri, 25 Nov 2016 09:49:21 GMT<![CDATA[Reply to Undefined error 'undefined reference to `_imp___ZN12QApplicationC1ERiPPci'" on Fri, 25 Nov 2016 09:48:45 GMT]]>Hi
Can you try a default project?

File -> New Project -> Application -> Qt widget project

and see if that run.

]]>https://forum.qt.io/post/361579https://forum.qt.io/post/361579Fri, 25 Nov 2016 09:48:45 GMT