Linking errors in FLTK 2.0 in windows

Question

I am using Qt Creator( without using any of Qt libraries) to test a Hello World project of FLTK2.0. But I am getting errors like:

Errors: UpBox.cxx:-1: error: undefined reference to SelectObject@8' UpBox.cxx:-1: error: undefined reference toSetROP2@8' UpBox.cxx:-1: error: undefined reference to PatBlt@24' UpBox.cxx:-1: error: undefined reference toCreatePatternBrush@4' UpBox.cxx:-1: error: undefined reference to DeleteObject@4' :-1: error: C:\Users\mypc\Desktop\FLTK\fltk-2.0-win-bin\lib/libfltk2.a(UpBox.o): bad reloc address 0xb in section.text$_ZN4fltk7FlatBoxD1Ev[__ZN4fltk7FlatBoxD1Ev]'

The main.cpp file is given below:

#include <fltk/Window.h>
#include <fltk/Widget.h>
#include <fltk/run.h>

using namespace fltk;

int main(int argc, char **argv) {
    Window *window = new Window(300, 180);
    window->begin();
    Widget *box = new Widget(20, 40, 260, 100, "Hello, World!");
    box->box(UP_BOX);
    box->labelfont(HELVETICA_BOLD_ITALIC);
    box->labelsize(36);
    box->labeltype(SHADOW_LABEL);
    window->end();
    window->show(argc, argv);
    return run();
}

The hello.pro file:

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
SOURCES += main.cpp
CONFIG+= c++11
LIBS += -L"C:\\Users\\mypc\\Desktop\\FLTK\\fltk-2.0-win-bin\\lib" -lfltk2
INCLUDEPATH += "C:\\Users\\mypc\\Desktop\\FLTK\\fltk-2.0-win-bin\\include"
DEPENDPATH += "C:\\Users\\mypc\\Desktop\\FLTK\\fltk-2.0-win-bin\\include"

Why am I getting these errors?

n.b: the FLTK 2.o MinGw compiled binaries are downloaded from FLTK Windows binaries

If you do a search for e.g. `CreatePatternBrush` you should quickly find [this link](http://msdn.microsoft.com/en-us/library/dd183508%28v=vs.85%29.aspx) which tells you what *system* library you need to link with. — Some programmer dude, Sep 05 '14 at 07:00

score 1 · Answer 1 · answered Sep 05 '14 at 07:08

1

The static library FLTK is correctly linked, but it also requires to be linked to Win32 API to work on windows.

You have to link to Gdi32.dll as well.

answered Sep 05 '14 at 07:08

Jaffa

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I have added win32: LIBS += -lgdi32 -lws2_32 -lOle32 to the hello.pro file. still I am getting errors like: run.cxx:-1: error: undefined reference to `IID_IUnknown',run.cxx:-1: error: undefined reference to `IID_IDropTarget' – user1659459 Sep 05 '14 at 07:14
Link to uuid.lib also? – Jaffa Sep 05 '14 at 07:19
After adding uuid.lib there are no linking errors. But when I try to run the app it stops working. @Geoffroy – user1659459 Sep 05 '14 at 07:25
i.e. a popup box says that the application has stopped working – user1659459 Sep 05 '14 at 07:28
I run the debugger and it says that "the inferior stopped because it received a signal from operating system. Signal name: SIGSEGV, signal meaning: segmentation fault – user1659459 Sep 05 '14 at 07:31
Then it's not the same problem, post it as a different question. – Jaffa Sep 05 '14 at 08:02
I can post it after 90 min. In the meantime can you please give some insight what to do? @Geoffroy – user1659459 Sep 05 '14 at 08:21
You're accessing a memory segment which you should not, hence the segv. I don't know how fltk works so I can't help you more sorry – Jaffa Sep 05 '14 at 08:23
@user1659459 as this seems to solve your question, accept the answer – Jaffa Sep 11 '14 at 04:35

Linking errors in FLTK 2.0 in windows

1 Answers1

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