MXE with Qt5.9.2 + GCC 7.2.0 build error

[Lubomir I. Ivanov]

On 12 October 2017 at 09:24, Stefan Fuchs <sfuchs at gmx.de> wrote:
> Hi All,
>
> when building MXE to update to Qt5.9.2 I this time selected the gcc 7 plugin
> in MXE to use gcc 7.2.0 instead of 5x. Please don't ask me why - I just
> wanted to try ;-)
>
>
> Now I have this compile error:
>
> [ 59%] Building CXX object
> desktop-widgets/CMakeFiles/subsurface_interface.dir/updatemanager.cpp.obj
> In file included from
> /home/stefan/Entwicklung/Subsurface/mxe-current-git/usr/lib/gcc/i686-w64-mingw32.shared/7.2.0/include/c++/bits/stl_algo.h:59:0,
>                  from
> /home/stefan/Entwicklung/Subsurface/mxe-current-git/usr/lib/gcc/i686-w64-mingw32.shared/7.2.0/include/c++/algorithm:62,
>                  from
> /home/stefan/Entwicklung/Subsurface/mxe-current-git/usr/i686-w64-mingw32.shared/qt5/include/QtCore/qglobal.h:109,
>                  from
> /home/stefan/Entwicklung/Subsurface/mxe-current-git/usr/i686-w64-mingw32.shared/qt5/include/QtCore/qnamespace.h:43,
>                  from
> /home/stefan/Entwicklung/Subsurface/mxe-current-git/usr/i686-w64-mingw32.shared/qt5/include/QtCore/qobjectdefs.h:48,
>                  from
> /home/stefan/Entwicklung/Subsurface/mxe-current-git/usr/i686-w64-mingw32.shared/qt5/include/QtCore/qobject.h:46,
>                  from
> /home/stefan/Entwicklung/Subsurface/mxe-current-git/usr/i686-w64-mingw32.shared/qt5/include/QtCore/QObject:1,
>                  from
> /home/stefan/Entwicklung/Subsurface/subsurface/./desktop-widgets/updatemanager.h:5,
>                  from
> /home/stefan/Entwicklung/Subsurface/subsurface/desktop-widgets/updatemanager.cpp:2:
> /home/stefan/Entwicklung/Subsurface/mxe-current-git/usr/lib/gcc/i686-w64-mingw32.shared/7.2.0/include/c++/cstdlib:75:15:
> fatal error: stdlib.h: No such file or directory
>  #include_next <stdlib.h>
>                ^~~~~~~~~~
> compilation terminated.
> desktop-widgets/CMakeFiles/subsurface_interface.dir/build.make:191: die
> Regel für Ziel
> „desktop-widgets/CMakeFiles/subsurface_interface.dir/updatemanager.cpp.obj“
> scheiterte
>
> Is this s.th. we can even fix in our code (??) or makefiles? Or shall I
> better go back to standard gcc 5x again?
>

this looks like something which isn't a problem on the subsurface side.
my bet is that the mingw 7x "dudes" are doing something wrong with
#include_next.

fixing compiler headers is always a bad idea, so i'd suggest that you
try another compiler and report the issue to MXE.

lubomir
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