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TEMPLATE = subdirs
CONFIG += ordered
SUBDIRS = lib gui console test

gui.depends = lib
console.depends = lib
test.depends = lib

--- testlib.pro

TEMPLATE = subdirs
SUBDIRS = lib test
test.depends = lib

--- lib/lib.pro

QT       -= core gui
TARGET = lib
TEMPLATE = lib
DESTDIR = $$PWD/../bin
SOURCES += lib.cpp
CONFIG += staticlib
HEADERS += lib.h

--- lib/lib.cpp

#include "lib.h"
std::string TestLib::getText() { return "zzzzz"; }

--- lib/lib.h

#ifndef LIB_H
#define LIB_H
#include <iostream>
class TestLib {
public:
    static std::string getText(); };
#endif // LIB_H

--- test/test.pro

QT -= core gui
CONFIG += c++11
TARGET = test
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
INCLUDEPATH += $$PWD/../lib
LIBS += -L$$PWD/../bin -llib

--- test/main.cpp

#include "../lib/lib.h"
int main()
{
    std::cout << TestLib::getText();
    return 0; }

PRE_TARGETDEPS = $$PWD/../bin/liblib.a