Qt: Can't Find -Lgl Error

Qt linker errors: cannot find -lQtCored

You only need the following content:

TARGET = ProgName
TEMPLATE = app
CONFIG += console
QT -= gui

SOURCES += ...
HEADERS += ...

That is because core and gui are added to the QT variable automatically. In this particular case however, you can remove the gui default if you wish to build a console application as you seem. Although "CONFIG += console" could eventually do that for you. Besides this, everything will work automatically for you, so you do not need to pass the library path to the qt libraries and so forth. You would only need to use QT += widgets and similar lines if you used further Qt modules there are not there by default. Even then, you would not need to set the Qt library path as you did in your question.

Besides, if you wanna target cross-platform later, you may wish to add this:

CONFIG -= app_bundle

to avoid creating Mac bundle for console based applications.

If you have multiple versions of Qt installed as it seems, you need to use the qmake from the required version, and it will be fine. Just to give an example: I use qmake for Qt 5 on my Archlinux system, and qmake-qt4 for Qt4.

On windows, you should either have the desired qt installation bin in the path before the undesired, or you need to call desired qmake explicitly, something like C:\path\to\my\desired\qmake.

QT Creator Linker Error: Link2019 File Not Found

By making the function static you gave it internal linkage. This means the definition of your function will only be found in the translation unit in which it is defined (i.e, terrain.cpp) and not main.cpp. Remove the static keyword.

This is very easy to confirm with objdump. Say you have test.h:

#ifndef _TEST_H
#define _TEST_H

static void a_func();

#endif

test.cpp:

#include "test.h"

void a_func()
{
}

main.cpp:

#include "test.h"

void a_func()
{
}

int main()
{
}

You'll notice that you won't get a function redefinition error. We can compile each file separately to inspect the objects:

g++ -c test.cpp -o test.o 
g++ -c main.cpp -o main.o

Both will show a_func:

Disassembly of section .text:

0000000000000000 <_ZL6a_funcv>:
   0:   55                      push   %rbp
   1:   48 89 e5                mov    %rsp,%rbp
   4:   90                      nop
   5:   5d                      pop    %rbp
   6:   c3                      retq

Now what about the final binary?

g++ main.o test.o

objdump -d ./a.out

00000000004005b6 <_ZL6a_funcv>:
  4005b6:   55                      push   %rbp
  4005b7:   48 89 e5                mov    %rsp,%rbp
  4005ba:   90                      nop
  4005bb:   5d                      pop    %rbp
  4005bc:   c3                      retq   

00000000004005bd <main>:
  4005bd:   55                      push   %rbp
  4005be:   48 89 e5                mov    %rsp,%rbp
  4005c1:   b8 00 00 00 00          mov    $0x0,%eax
  4005c6:   5d                      pop    %rbp
  4005c7:   c3                      retq   

00000000004005c8 <_ZL6a_funcv>:
  4005c8:   55                      push   %rbp
  4005c9:   48 89 e5                mov    %rsp,%rbp
  4005cc:   90                      nop
  4005cd:   5d                      pop    %rbp
  4005ce:   c3                      retq   
  4005cf:   90                      nop

It appears twice! This is why you don't make functions static in a header file meant to be shared across multiple translation units.

C++ Qt framework: qmake exits with error code 2, can not find project.pro file, yet it's there

Are you sure that you don't have space or other 'weird' characters in your project's path? If so, Qt is unhappy.

You may also try to delete the *.pro.user file and try to compile again.
If unfortunately neither of them work, you can try to compile your project on the command line.

cd to the root directory of your project and:

1. qmake -project
2. mingw32-make

If this still can't get your project compiled, you should check your Qt installation.

Qt Creator 2.1.0 can't find Qt, looks in wrong place

http://bugreports.qt-project.org/browse/QTBUG-18230

Turns out .qmake.cache was out of date, deleting it solved the problem.

Qt can't find files in a subproject

JenkinsTestMain/ is not in the INCLUDEPATH, thus person.h is not found.

In JenkinsTestSuite.pro, you must add

INCLUDEPATH += ../JenkinsTestMain

Alternatively, use #include in the test.

I also suggest to add a DEPENDPATH += for each INCLUDEPATH +=, otherwise changes to person.h won't trigger persontest.cpp to be recompiled, which leads to wrong behaviour and crashes.

Another issue here is that person.cpp is not part of JenkinsTest. You must either compile person.cpp another time for JenkinsTest, or put that code into a shared library.

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