Hello,

I just posted a different question about the same testing code here.

My test suite includes a class called TestOutgoingCall, which tests a class called -- surprise surprise -- OutgoingCall. That class lives one directory up. As a convenience, therefore, I added .. to the INCLUDEPATH of my test .pro file:

Qt Code: 
  1. QT += core testlib
  2. TEMPLATE = app
  3. TARGET = test
  4. INCLUDEPATH += . ..
  5.  
  6. # Input
  7. SOURCES += \
  8.     main.cpp \
  9.     testoutgoingcall.cpp \
  10.     testscopelock.cpp
  11.  
  12. HEADERS += \
  13.     testoutgoingcall.h \
  14.     testscopelock.h \
  15.     testcase.h
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Here is testoutgoingcall.h:

Qt Code: 
  1. #ifndef TESTOUTGOINGCALL_H
  2. #define TESTOUTGOINGCALL_H
  3.  
  4. #include "testcase.h"
  5.  
  6. class OutgoingCall;
  7.  
  8. class TestOutgoingCall : public TestCase
  9. {
  10.     Q_OBJECT
  11. private slots:
  12.     void initTestCase();
  13.     void cleanupTestCase();
  14.  
  15. private:
  16.     OutgoingCall *call;
  17. };
  18.  
  19. #endif // TESTOUTGOINGCALL_H
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and here is the .cpp file:

Qt Code: 
  1. #include "testoutgoingcall.h"
  2.  
  3. #include "OutgoingCall.h"
  4. #include "OutgoingCall.cpp" // FIXME WHY DO WE NEED THIS TO COMPILE?! 07.31.15
  5.  
  6. void TestOutgoingCall::initTestCase() {
  7.     call = new OutgoingCall("", "");
  8. }
  9.  
  10. void TestOutgoingCall::cleanupTestCase() {
  11.     delete call;
  12. }
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As you can see, the implementation is as yet trivial, which is fine. The problem is that if I remove #include "OutgoingCall.cpp" I get the following compiler errors:

Qt Code: 
  1. Undefined symbols for architecture x86_64:
  2.   "OutgoingCall::OutgoingCall(QString, QString)", referenced from:
  3.       TestOutgoingCall::initTestCase() in testoutgoingcall.o
  4. ld: symbol(s) not found for architecture x86_64
  5. clang: error: linker command failed with exit code 1 (use -v to see invocation)
  6. make: *** [test.app/Contents/MacOS/test] Error 1
  7. 15:43:14: The process "/usr/bin/make" exited with code 2.
  8. Error while building/deploying project test (kit: Desktop Qt 5.5.0 clang 64bit)
  9. When executing step "Make"
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The constructor for Outgoing call takes two QStrings. Everything works when I un-comment that include.

What is going on here? I'm fairly certain that including a .cpp file after the .h file is the Wrong Way To Do It.

Any insight is appreciated.

Thank you!