Openage: Qt MOC build error because of compact namespace definitions

[k3x]

$make
[...]
[ 12%] Building CXX object nyan-external/bin/nyan/CMakeFiles/nyan.dir/value/value.cpp.o
[ 12%] Building CXX object nyan-external/bin/nyan/CMakeFiles/nyan.dir/value/value_holder.cpp.o
[ 12%] Building CXX object nyan-external/bin/nyan/CMakeFiles/nyan.dir/view.cpp.o
[ 13%] Linking CXX shared library libnyan.so
Scanning dependencies of target cythonize
[ 14%] pxdgen: generating .pxd files from headers
[ 14%] cythonize.py: compiling .pyx files to .cpp
Scanning dependencies of target codegen
[ 14%] openage.codegen: generating c++ code
Scanning dependencies of target libopenage_autogen
[ 14%] Automatic MOC for target libopenage

AutoMoc subprocess error
------------------------
moc failed for
  "/home/felix/Desktop/openage/openage/libopenage/engine.h"

Command
-------
/usr/lib/x86_64-linux-gnu/qt5/bin/moc -I/home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none/libopenage/libopenage_autogen/include -I/usr/include/freetype2 -I/usr/include/x86_64-linux-gnu/freetype2 -I/usr/include/opus -I/usr/include/SDL2 -I/home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none/nyan-external/source/nyan/.. -I/usr/include/eigen3 -I/usr/include/x86_64-linux-gnu/qt5 -I/usr/include/x86_64-linux-gnu/qt5/QtCore -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64 -I/usr/include/x86_64-linux-gnu/qt5/QtQuick -I/usr/include/x86_64-linux-gnu/qt5/QtQml -I/usr/include/x86_64-linux-gnu/qt5/QtNetwork -I/usr/include/x86_64-linux-gnu/qt5/QtGui -I/usr/include -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_QML_LIB -DQT_QUICK_LIB -o /home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none/libopenage/libopenage_autogen/EWIEGA46WW/moc_engine.cpp /home/felix/Desktop/openage/openage/libopenage/engine.h

Output
------
home/felix/Desktop/openage/openage/libopenage/util/constexpr.:12: Parse error at "openage"

libopenage/CMakeFiles/libopenage_autogen.dir/build.make:77: die Regel für Ziel „libopenage/CMakeFiles/libopenage_autogen“ scheiterte
make[3]: *** [libopenage/CMakeFiles/libopenage_autogen] Fehler 1
CMakeFiles/Makefile2:1567: die Regel für Ziel „libopenage/CMakeFiles/libopenage_autogen.dir/all“ scheiterte
make[2]: *** [libopenage/CMakeFiles/libopenage_autogen.dir/all] Fehler 2
Makefile:162: die Regel für Ziel „all“ scheiterte
make[1]: *** [all] Fehler 2
Makefile:33: die Regel für Ziel „build“ scheiterte
make: *** [build] Fehler 2

previous:

$./configure --download-nyan --mode=release --compiler=clang --prefix=/usr/local
 _________________________________________
/ ./configure is a convenience script: it \
| creates the build directory, symlinks   |
| it, and invokes cmake for an            |
| out-of-source build.                    |
|                                         |
| Nobody is stopping you from skipping    |
| ./configure and our Makefile, and using |
| CMake directly (e.g. when packaging, or |
| using an IDE). For your convenience,    |
| ./configure even prints the direct      |
\ CMake invocation!                       /
 -----------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

         build_type | Release
       cxx_compiler | clang++
          cxx_flags | 
   exe_linker_flags | 
     install_prefix | /usr/local
module_linker_flags | 
shared_linker_flags | 

config options:

          backtrace | if_available
gperftools-profiler | if_available
gperftools-tcmalloc | False
            inotify | if_available
            ncurses | if_available
             opengl | if_available
             vulkan | if_available

bindir:
/home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none/

invocation:
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS='' -DCMAKE_EXE_LINKER_FLAGS='' -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_MODULE_LINKER_FLAGS='' -DCMAKE_SHARED_LINKER_FLAGS='' -DDOWNLOAD_NYAN=YES -DCXX_OPTIMIZATION_LEVEL=auto -DCXX_SANITIZE_FATAL=False -DCXX_SANITIZE_MODE=none -DWANT_BACKTRACE=if_available -DWANT_GPERFTOOLS_PROFILER=if_available -DWANT_GPERFTOOLS_TCMALLOC=False -DWANT_INOTIFY=if_available -DWANT_NCURSES=if_available -DWANT_OPENGL=if_available -DWANT_VULKAN=if_available -- /home/felix/Desktop/openage/openage

(now running cmake:)



 ___  ______ _______ _______ ___
|  _)/ _____|_______|_______|_  |
| | ( (____  _____      _     | |    ___  ____  _____ ____  _____  ____ _____
| |  \____ \|  ___)    | |    | |   / _ \|  _ \| ___ |  _ \(____ |/ _  | ___ |
| |_ _____) ) |        | |   _| |  | |_| | |_| | ____| | | / ___ ( (_| | ____|
|___|______/|_|        |_|  (___|   \___/|  __/|_____)_| |_\_____|\___ |_____)
                                         |_|                     (_____|

Welcome to the SFT technologies computer-aided openage build system!

You have chosen, or been chosen, to attempt the daring task of building openage.
If you have installed all the dependencies that are conveniently listed in
[doc/building.md], this _might_ just work!

If it doesn't, consider reporting the issue: https://github.com/SFTtech/openage
Or ask for help:
  * Matrix: #sfttech:matrix.org
  * IRC:    #sfttech on freenode.net

-- Using python interpreter: /usr/bin/python3
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) 
CMake Warning at buildsystem/doxygen.cmake:50 (message):
  doxygen couldn't be found, you won't be able to generate docs
Call Stack (most recent call first):
  CMakeLists.txt:190 (doxygen_configure)


You have called ADD_LIBRARY for library libopenage without any source files. This typically indicates a problem with your CMakeLists.txt file
-- Could NOT find GCCBacktrace (missing: GCCBacktrace_LIBRARIES GCCBacktrace_INCLUDE_DIRS) 
-- Could NOT find nyan (missing: nyan_DIR)
-- Downloading nyan as submodule project...


       ▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄
      █░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░░█
      █░▒▒▒▒▒▒▒▒▒▒▄▀▀▄▒▒▒░░█▄▀▀▄
 ▄▄   █░▒▒▒▒▒▒▒▒▒▒█▓▓▓▀▄▄▄▄▀▓▓▓█      ▄ ▄▄   ▄   ▄   ▄▄▄   ▄ ▄▄
█▓▓█▄▄█░▒▒▒▒▒▒▒▒▒▄▀▓▓▓▓▓▓▓▓▓▓▓▓▀▄     █▀  █  ▀▄ ▄▀  ▀   █  █▀  █
 ▀▄▄▓▓█░▒▒▒▒▒▒▒▒▒█▓▓▓▄█▓▓▓▄▓▄█▓▓█     █   █   █▄█   ▄▀▀▀█  █   █
    ▀▀█░▒▒▒▒▒▒▒▒▒█▓▒▒▓▄▓▓▄▓▓▄▓▒▒█     █   █   ▀█    ▀▄▄▀█  █   █
     ▄█░░▒▒▒▒▒▒▒▒▒▀▄▓▓▀▀▀▀▀▀▀▓▄▀              ▄▀
   ▄▀▓▀█▄▄▄▄▄▄▄▄▄▄▄▄██████▀█▀▀               ▀▀
   █▄▄▀ █▄▄▀       █▄▄▀ ▀▄▄█


For information about building, look at [doc/building.md].

If you encounter problems you can't fix yourself,
report problems at https://github.com/SFTtech/nyan

Contact: #sfttech:matrix.org

-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) 

          project | nyan
          version | 1.0
         compiler | Clang 6.0.1
       build type | Release
         cxxflags |  -Wall -Wextra -pedantic
 build type flags | -O3
        build dir | /home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none
   install prefix | /usr/local

-- nyan processed successfully!
-- optional dependency is unavailable: backtrace
-- Could NOT find Gperftools (missing: GPERFTOOLS_LIBRARIES GPERFTOOLS_INCLUDE_DIR) 
-- optional dependency is unavailable: gperftools-profiler
-- Could NOT find Curses (missing: CURSES_LIBRARY CURSES_INCLUDE_PATH) 
-- optional dependency is unavailable: ncurses
-- Could NOT find Vulkan (missing: Vulkan_LIBRARY Vulkan_INCLUDE_DIR) 
-- optional dependency is unavailable: vulkan

cython module
    run                                                 [embedded interpreter] [noinstall]
    openage.cabextract.lzxd
    openage.cabextract.cabchecksum                      [standalone]
    openage.convert.slp
    openage.convert.interface.visgrep
    openage.convert.opus.opusenc
    openage.cppinterface.exctranslate
    openage.cppinterface.exctranslate_tests
    openage.cppinterface.pyobject
    openage.cppinterface.setup_checker
    openage.cvar.cvar
    openage.event.demo
    openage.game.main_cpp
    openage.log.log_cpp
    openage.util.filelike.cpp
    openage.util.fslike.cpp
    openage.renderer.renderer_cpp
    openage.renderer.tests
    openage.testing.cpp_testing
    openage.testing.misc_cpp

enabled options:
    inotify
    opengl

disabled options:
    backtrace
    gperftools-profiler
    gperftools-tcmalloc
    ncurses
    vulkan

openage v0.3.0-1312-g69223d8

         compiler | Clang 6.0.1
       build type | Release
         cxxflags |   -Wall -Wextra -pedantic -Wno-gnu-statement-expression
 build type flags | -DNDEBUG -O3
        build dir | /home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none
   install prefix | /usr/local
py install prefix | /usr/lib/python3/dist-packages

-- Configuring done
-- Generating done
-- Build files have been written to: /home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none

[TheJJ]

Hmm, /util/constexpr.:12: Parse error at "openage" looks suspicious.

Any idea where that comes from? Does the moc command (with all its args) fail reliably, when you execute it manually?

[k3x]

Yes, the moc command fails all the time:

/usr/lib/x86_64-linux-gnu/qt5/bin/moc -I/home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none/libopenage/libopenage_autogen/include -I/usr/include/freetype2 -I/usr/include/x86_64-linux-gnu/freetype2 -I/usr/include/opus -I/usr/include/SDL2 -I/home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none/nyan-external/source/nyan/.. -I/usr/include/eigen3 -I/usr/include/x86_64-linux-gnu/qt5 -I/usr/include/x86_64-linux-gnu/qt5/QtCore -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64 -I/usr/include/x86_64-linux-gnu/qt5/QtQuick -I/usr/include/x86_64-linux-gnu/qt5/QtQml -I/usr/include/x86_64-linux-gnu/qt5/QtNetwork -I/usr/include/x86_64-linux-gnu/qt5/QtGui -I/usr/include -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_QML_LIB -DQT_QUICK_LIB -o /home/felix/Desktop/openage/openage/.bin/clang++-release-Oauto-sanitize-none/libopenage/libopenage_autogen/EWIEGA46WW/moc_engine.cpp /home/felix/Desktop/openage/openage/libopenage/engine.h

home/felix/Desktop/openage/openage/libopenage/util/constexpr.:12: Parse error at "openage"

Using g++ (Ubuntu 7.3.0-21ubuntu1~16.04) 7.3.0 gives the same error...

[TheJJ]

The moc is a tool from Qt that creates c++ files from existing c++-files with qt-annotations. What Qt version do you have?

I suspect that there is a problem with your moc installation (i.e. Qt), because there hasn't been a bug report about that and many ubuntu users had success installing openage.
Do you have any PPAs active?

[surajhanchinal]

Was there any progress on this issue. Because I tried this with a fresh installation of ubuntu 16.04 and get the same error. Previously however, I have managed to get it to work without facing this error on ubuntu 16.04

[surajhanchinal]

Update
This issue is caused by the compact namespace definitions of the form namespace a::b::c in the files openage/libopenage/util/constexpr.h and openage/libopenage/util/misc.h. This error can be removed using cascading namespaces or by upgrading Qt version to Qt 5.8 where it seems to be solved.

[TheJJ]

Can you submit a pull request please, with this version bump of Qt and also updated build requirement documents?

[TheJJ]

We'll bump the version in #1064.