Error: undefined reference to `qMain(int, char**)'

[nimingzhe2008]

When I compiled my project,Qt Creator showed this error.I googled it,and many people say it's because of losing main function.But I actually have main function.
main.cpp
@#include<QApplication>
#include"dialog.h"

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
dialog d;
d.show();

return app.exec();
}
@

.pro
@TEMPLATE = app
TARGET = custombutton_mine
HEADERS +=
mybutton.h
dialog.h

SOURCES +=
mybutton.cpp
dialog.cpp
main.cpp

FORMS +=
dialog.ui@

[JadeN001]

I'm getting the same error at compile time. Tried checking entire code line by line , yet can't figure it out.

[JonB]

@JadeN001
How you get the same error "at run time" given that it's a compile-time error message?

[JadeN001]

@JonB sorry its by mistake,yeah i am getting it at compile time

[kshegunov]

What OS, what Qt version, which compiler?
What do you have in your project file (.pro)?

[JadeN001]

@kshegunov OS:windows
qt version : Qt 5.10.1 (MSVC 2015, 32 bit).
i am using sub-project for plugin implementation so my main pro file is containing only
TEMPLATE = subdirs

SUBDIRS =
Server
plugin

but i think problem is in my plugin project which is sub project of my main project.

plugin.pro

TEMPLATE        = lib
CONFIG         += plugin
QT             += widgets
INCLUDEPATH    += ../mainwindow
HEADERS += \
    broadcast_plugin.h

SOURCES += \
    broadcast_plugin.cpp
TARGET          = $$qtLibraryTarget(broadcast_plugin)
DESTDIR         = ../plugins

[kshegunov]

@JadeN001 said in Error: undefined reference to `qMain(int, char**)':

but i think problem is in my plugin project which is sub project of my main project.

You can know - it's a linker error and you should check the build output. Provide the relevant project file for the binary that fails to link.

[JadeN001]

@kshegunov yeah thanks..i will go through it.