specified path differs in case from file name on disk [-Werror,-Wnonportable-include-path] on macOS

[maltekliemann]

If you cd into the project directory on macOS Terminal using the incorrect casing (e.g. cd DrMock if the directory is called drmock), then the following occurs:

In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/mocs_compilation.cpp:2:
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/moc_EmitMock.cpp:10:
/Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/../../DrMock/mock/EmitMock.h:7:10: error: 
      non-portable path to file '"/Users/malte/drmock/tests/mocker/IEmit.h"'; specified path differs in
      case from file name on disk [-Werror,-Wnonportable-include-path]
#include "/Users/malte/DrMock/tests/mocker/IEmit.h"
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         "/Users/malte/drmock/tests/mocker/IEmit.h"
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/mocs_compilation.cpp:3:
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/moc_QObjectMock.cpp:10:
/Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/../../DrMock/mock/QObjectMock.h:7:10: error: 
      non-portable path to file '"/Users/malte/drmock/tests/mocker/IQObject.h"'; specified path differs
      in case from file name on disk [-Werror,-Wnonportable-include-path]
#include "/Users/malte/DrMock/tests/mocker/IQObject.h"
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         "/Users/malte/drmock/tests/mocker/IQObject.h"
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/mocs_compilation.cpp:4:
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/moc_SignalsMock.cpp:10:
/Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/../../DrMock/mock/SignalsMock.h:7:10: error: 
      non-portable path to file '"/Users/malte/drmock/tests/mocker/ISignals.h"'; specified path differs
      in case from file name on disk [-Werror,-Wnonportable-include-path]
#include "/Users/malte/DrMock/tests/mocker/ISignals.h"
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         "/Users/malte/drmock/tests/mocker/ISignals.h"
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/mocs_compilation.cpp:5:
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/moc_SlotsMock.cpp:10:
/Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/../../DrMock/mock/SlotsMock.h:7:10: error: 
      non-portable path to file '"/Users/malte/drmock/tests/mocker/ISlots.h"'; specified path differs
      in case from file name on disk [-Werror,-Wnonportable-include-path]
#include "/Users/malte/DrMock/tests/mocker/ISlots.h"
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         "/Users/malte/drmock/tests/mocker/ISlots.h"
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/mocs_compilation.cpp:6:
In file included from /Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/moc_UseQtMock.cpp:10:
/Users/malte/DrMock/build/tests/mocker/DrMockQtMock_autogen/U4H3QIWQU5/../../DrMock/mock/UseQtMock.h:7:10: error: 
      non-portable path to file '"/Users/malte/drmock/tests/mocker/IUseQt.h"'; specified path differs
      in case from file name on disk [-Werror,-Wnonportable-include-path]
#include "/Users/malte/DrMock/tests/mocker/IUseQt.h"
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         "/Users/malte/drmock/tests/mocker/IUseQt.h"

This might happen on other case-insensitive filesystems. Note that only Qt-related files are affected. The same error occurs in projects using DrMock.