[CMake] Automoc fails on MSYS2/MinGW

[Ray Donnelly]

Hi Dmitry,

You should report this on MSYS2's github repo (Alexpux), we apply some
patches to Qt's CMake files and one of those may have caused this
issue. It's unlikely to be a problem with CMake.
On Thu, Oct 4, 2018 at 12:14 PM Dmitry Mikushin
<dmitry at parallel-computing.pro> wrote:
>
> Dear all,
>
> I'm currently looking into an error from Automoc below, which gives no clue about the cause of failure (Output is empty). The mechanics of Automoc in CMake is not clear. Looks like "cmake_autogen" only launches a command described in variables. But where the command return value is checked? What places should I look at to debug cmake_autogen/automoc in CMake?
>
> Thanks & Kind regards,
> - Dmitry Mikushin.
>
> $ make
> [  0%] Automatic MOC for target glazomer
> Start
>
> AutoMoc subprocess error
> ------------------------
> The content generation command for "moc_predefs.h" failed.
>
> Command
> -------
> /mingw64/bin/x86_64-w64-mingw32-g++.exe -dM -E -c /usr/share/cmake-3.12.2/Modules/CMakeCXXCompilerABI.cpp -I/c/Users/dmikushin/glazomer/glazomer/build/glazomer_autogen/include -I/mingw64/include/QtDBus -I/mingw64/include/QtNetwork -I/mingw64/include/QtTest -I/mingw64/include/qwt -I/mingw64/include/libusb-1.0 -I/c/Users/dmikushin/glazomer/glazomer/ThirdParty/eigen -I/c/Users/dmikushin/glazomer/glazomer/src -I/mingw64/include -I/mingw64/include/QtCore -I/mingw64/share/qt5/mkspecs/win32-g++ -I/mingw64/include/QtGui -I/mingw64/include/QtWidgets -DQT_CORE_LIB -DQT_GUI_LIB -DQT_WIDGETS_LIB
>
> Output
> ------
>
> make[2]: *** [CMakeFiles/glazomer_autogen.dir/build.make:58: CMakeFiles/glazomer_autogen] Error 1
> make[1]: *** [CMakeFiles/Makefile2:180: CMakeFiles/glazomer_autogen.dir/all] Error 2
> make: *** [Makefile:130: all] Error 2
>
> --
>
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