QT5 build: CC: No such file or directory

SGaist

No problem, you can checkout at branch at any time. Just ensure that all sub modules are as well.

You definitively want to nuke the build folder.

Michele31415

@SGaist Yup, configure ran cleanly through this time, first try. Assuming the gmake works, I'm wondering about this bit:

Qt is now configured for building. Just run 'gmake'.
Once everything is built, you must run 'gmake install'.
Qt is now configured for building. Just run 'gmake'.
Once everything is built, you must run 'gmake install'.
Qt will be installed into

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

That line that says "Qt will be installed into" just ends in space. Have I missed something else now?

Michele31415

gmake failed again but I can't find an actual error line anywhere in the output, just that "Error 2" at the very end.

...
../../../include/QtCore/../../../../qtbase/src/corelib/tools/qlist.h:238:16: note: because ‘QList<QString>::iterator’ has user-provided ‘QList<T>::iterator::iterator(const QList<T>::iterator&) [with T = QString]’
  238 |         inline iterator(const iterator &o) Q_DECL_NOTHROW : i(o.i){}
      |                ^~~~~~~~
rm -f ../../../lib/libQt5Bootstrap.a
ar cq ../../../lib/libQt5Bootstrap.a .obj/qlatincodec.o .obj/qtextcodec.o .obj/qutfcodec.o .obj/qglobal.o .obj/qlogging.o .obj/qmalloc.o .obj/qnumeric.o .obj/qabstractfileengine.o .obj/qbuffer.o .obj/qdatastream.o .obj/qdebug.o .obj/qdir.o .obj/qdiriterator.o .obj/qfile.o .obj/qfileinfo.o .obj/qfilesystementry.o .obj/qfilesystemengine.o .obj/qfsfileengine.o .obj/qfsfileengine_iterator.o .obj/qiodevice.o .obj/qfiledevice.o .obj/qresource.o .obj/qtemporaryfile.o .obj/qtextstream.o .obj/qstandardpaths.o .obj/qloggingcategory.o .obj/qloggingregistry.o .obj/qcoreapplication.o .obj/qcoreglobaldata.o .obj/qmetatype.o .obj/qvariant.o .obj/qsystemerror.o .obj/quuid.o .obj/qbitarray.o .obj/qbytearray.o .obj/qarraydata.o .obj/qbytearraymatcher.o .obj/qcommandlineparser.o .obj/qcommandlineoption.o .obj/qcryptographichash.o .obj/qdatetime.o .obj/qhash.o .obj/qlist.o .obj/qlinkedlist.o .obj/qlocale.o .obj/qlocale_tools.o .obj/qmap.o .obj/qregexp.o .obj/qringbuffer.o .obj/qpoint.o .obj/qrect.o .obj/qsize.o .obj/qline.o .obj/qstring.o .obj/qstringbuilder.o .obj/qstring_compat.o .obj/qstringlist.o .obj/qvector.o .obj/qvsnprintf.o .obj/qxmlutils.o .obj/qxmlstream.o .obj/qjson.o .obj/qjsondocument.o .obj/qjsonobject.o .obj/qjsonarray.o .obj/qjsonvalue.o .obj/qjsonparser.o .obj/qjsonwriter.o .obj/qdom.o .obj/qxml.o .obj/qfilesystemengine_unix.o .obj/qfilesystemiterator_unix.o .obj/qfsfileengine_unix.o .obj/qstandardpaths_unix.o
gmake[3]: Leaving directory '/opt/qt5/qt5-build/qtbase/src/tools/bootstrap'
gmake[2]: Leaving directory '/opt/qt5/qt5-build/qtbase/src'
gmake[1]: *** [Makefile:47: sub-src-make_first] Error 2
gmake[1]: Leaving directory '/opt/qt5/qt5-build/qtbase'
gmake: *** [Makefile:85: module-qtbase-make_first] Error 2
/opt/qt5/qt5-build $

SGaist

@Michele31415 said in QT5 build: CC: No such file or directory:

@SGaist Yup, configure ran cleanly through this time, first try. Assuming the gmake works, I'm wondering about this bit:
Qt is now configured for building. Just run 'gmake'.
Once everything is built, you must run 'gmake install'.
Qt is now configured for building. Just run 'gmake'.
Once everything is built, you must run 'gmake install'.
Qt will be installed into

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.
That line that says "Qt will be installed into" just ends in space. Have I missed something else now?

If you used the same line as in your initial post, you are doing a developer build and hence it won't be installed. It's an "in place" build.

Unless you want to hack on Qt, you should drop that option as it changes some flags (I don't remember which though).

SGaist

As for the bootstrap error, are you using a multithreaded build ? I do not see the error trigger the stop.

Michele31415

@SGaist "If you used the same line as in your initial post"
Arrgh, yes I did. OK, we start over again. This time:

/opt/qt5/qt5-build $ ../configure  -opensource -nomake examples -nomake tests -platform solaris-g++

This also worked. Now starting gmake -j16 again.
UPDATE:
It just doesn't seem to like qvncscreen.cpp:

/opt/qt5/qtbase/src/plugins/platforms/vnc/qvncscreen.cpp: In member function ‘bool QVncScreen::swapBytes() const’:
/opt/qt5/qtbase/src/plugins/platforms/vnc/qvncscreen.cpp:182:24: error: invalid use of incomplete type ‘class QScreen’
  182 |         return screen()->frameBufferLittleEndian();
      |                        ^~
In file included from ../../../../include/QtGui/qcursor.h:1,
                 from ../../../../include/QtGui/5.8.0/QtGui/qpa/../../../../../../../qtbase/src/gui/kernel/qplatformscreen.h:60,
                 from ../../../../include/QtGui/5.8.0/QtGui/qpa/qplatformscreen.h:1,
                 from ../../../../include/QtFbSupport/5.8.0/QtFbSupport/private/../../../../../../../qtbase/src/platformsupport/fbconvenience/qfbscreen_p.h:54,
                 from ../../../../include/QtFbSupport/5.8.0/QtFbSupport/private/qfbscreen_p.h:1,
                 from /opt/qt5/qtbase/src/plugins/platforms/vnc/qvncscreen.h:43,
                 from /opt/qt5/qtbase/src/plugins/platforms/vnc/qvncscreen.cpp:40:
../../../../include/QtGui/../../../../qtbase/src/gui/kernel/qcursor.h:51:7: note: forward declaration of ‘class QScreen’
   51 | class QScreen;
      |       ^~~~~~~
/opt/qt5/qtbase/src/plugins/platforms/vnc/qvncscreen.cpp:183:12: error: ‘frameBufferLittleEndian’ was not declared in this scope
  183 |     return frameBufferLittleEndian();
      |            ^~~~~~~~~~~~~~~~~~~~~~~
gmake[5]: *** [Makefile:2355: .obj/qvncscreen.o] Error 1
gmake[5]: Leaving directory '/opt/qt5/qt5-build/qtbase/src/plugins/platforms/vnc'
gmake[4]: *** [Makefile:121: sub-vnc-make_first] Error 2
gmake[4]: Leaving directory '/opt/qt5/qt5-build/qtbase/src/plugins/platforms'
gmake[3]: *** [Makefile:100: sub-platforms-make_first] Error 2
gmake[3]: Leaving directory '/opt/qt5/qt5-build/qtbase/src/plugins'
gmake[2]: *** [Makefile:669: sub-plugins-make_first] Error 2
gmake[2]: Leaving directory '/opt/qt5/qt5-build/qtbase/src'
gmake[1]: *** [Makefile:47: sub-src-make_first] Error 2
gmake[1]: Leaving directory '/opt/qt5/qt5-build/qtbase'
gmake: *** [Makefile:85: module-qtbase-make_first] Error 2
/opt/qt5/qt5-build $

And indeed this seems to be MIA:

/opt/qt5 $ ggrep -rl "frameBufferLittleEndian" .           
./qtbase/src/plugins/platforms/vnc/qvncscreen.cpp
/opt/qt5 $

SGaist

@Michele31415 said in QT5 build: CC: No such file or directory:

frameBufferLittleEndian

You might be the first person building that plugin on a big endian system.

AFAIK, that call should be commented out with a Todo comment and the method do nothing and return false.

I'd recommend doing that so your build can continue.

Michele31415

I was actually wondering about that. So I've now changed that block at the end of qvncscreen.cpp to read

#if Q_BYTE_ORDER == Q_BIG_ENDIAN
bool QVncScreen::swapBytes() const
//bool QVNCScreen::swapBytes() const
{
    if (depth() != 16)
        return false;

//    if (screen())
//        return screen()->frameBufferLittleEndian();
//    return frameBufferLittleEndian();
    return false ;
}
#endif

Now we're getting

/opt/qt5/qtbase/src/plugins/platforms/vnc/qvncclient.cpp:642:9: error: ‘qvnc_screen’ was not declared in this scope
  642 |     if (qvnc_screen->swapBytes())

I'll have to see if qvnc_screen is actually declared anywhere.

Michele31415

I had to comment this out in qvncclient.cpp (probably not a good thing to do but I don't know what this is for and I don't really need VNC in QT anyway)::

#if Q_BYTE_ORDER == Q_BIG_ENDIAN
    //    m_swapBytes = qvnc_screen->swapBytes();
#endif

Now it's finally linking but still not happy with some qtserialbus stuff:

/opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.sold: 
fatal: symbol referencing errors
ld: fatal: symbol referencing errors
collect2: error: ld returned 1 exit status
collect2: error: ld returned 1 exit status
gmake[5]: *** [Makefile:74: ../../../../plugins/canbus/libqtpeakcanbus.so] Error 1
gmake[5]: Leaving directory '/opt/qt5/qt5-build/qtserialbus/src/plugins/canbus/peakcan'
gmake[5]: *** [Makefile:74: ../../../../plugins/canbus/libqttinycanbus.so] Error 1
gmake[5]: Leaving directory '/opt/qt5/qt5-build/qtserialbus/src/plugins/canbus/tinycan'
gmake[4]: *** [Makefile:69: sub-tinycan-make_first] Error 2
gmake[4]: *** Waiting for unfinished jobs....
gmake[4]: *** [Makefile:44: sub-peakcan-make_first] Error 2
gmake[4]: Leaving directory '/opt/qt5/qt5-build/qtserialbus/src/plugins/canbus'
gmake[3]: *** [Makefile:43: sub-canbus-make_first] Error 2
gmake[3]: Leaving directory '/opt/qt5/qt5-build/qtserialbus/src/plugins'
gmake[2]: *** [Makefile:70: sub-plugins-make_first] Error 2
gmake[2]: Leaving directory '/opt/qt5/qt5-build/qtserialbus/src'
gmake[1]: *** [Makefile:45: sub-src-make_first] Error 2
gmake[1]: Leaving directory '/opt/qt5/qt5-build/qtserialbus'
gmake: *** [Makefile:235: module-qtserialbus-make_first] Error 2

I'm not particularly interested in the serial bus. Can I exclude this somehow? I grepped the configure --help for "serial" but came up empty.

SGaist

You can add a -skip <module_to_skip> to the configure command for all modules you do not want to build.

When you have such build error, you should restart the build single threaded so you get the exact point where it failed. Here it is lost somewhere in one of the threads used for the build process.

Michele31415

@SGaist The errors seem to be in qtserialbus and MathExtras, Are those the names I'd put in -skip? (Or is there an easy fix for these?)
...

ld: warning: ld: warning: file libQt5SerialPort.so.5: required by /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so, not found
...
/opt/qt5/qtdeclarative/src/3rdparty/masm/wtf/MathExtras.h: At global scope:
/opt/qt5/qtdeclarative/src/3rdparty/masm/wtf/MathExtras.h:96:13: error: redefinition of ‘bool std::isfinite(double)’
...
In file included from /opt/qt5/qtdeclarative/src/qml/compiler/qv4compiler.cpp:46:
/opt/qt5/qtdeclarative/src/3rdparty/masm/wtf/MathExtras.h:99:13: error: redefinition of ‘bool std::signbit(double)’
...
In file included from /opt/qt5/qtdeclarative/src/qml/compiler/qv4compiler.cpp:46:
/opt/qt5/qtdeclarative/src/3rdparty/masm/wtf/MathExtras.h:102:13: error: redefinition of ‘bool std::isinf(double)’

SGaist

The skip option is only for module names.

As for the Qt declarative issue... gcc 10 is supported on Linux so it does look a bit strange...

Michele31415

What name should I give configure -skip to exclude the requirement for libQt5SerialPort.so?
Oh wait a minute, I do have that library:

/opt/qt5/qt5-build/qtserialbus/lib $ ls
cmake                     libQt5SerialBus.so        libQt5SerialBus.so.5.8.0
libQt5SerialBus.la        libQt5SerialBus.so.5      pkgconfig
libQt5SerialBus.prl       libQt5SerialBus.so.5.8
/opt/qt5/qt5-build/qtserialbus/lib $

So why is it saying:

g++ -z defs -Wl,-R,/lib -shared -o libqttinycanbus.so .obj/main.o .obj/tinycanbackend.o .obj/moc_tinycanbackend.o  -L/usr/sfw/lib -L/opt/qt5/qt5-build/qtserialbus/lib -lQt5SerialBus -L/opt/qt5/qt5-build/qtbase/lib -lQt5Core -lpthread -lrt  
ld: warning: ld: warning: file libQt5SerialPort.so.5: required by /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so, not found
file libQt5SerialPort.so.5: required by /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so, not found
Undefined			first referenced
 symbol  			    in file
_ZN11QSerialPort9setParityENS_6ParityE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
Undefined			first referenced
 symbol  			    in file
_ZN11QSerialPort11setStopBitsENS_8StopBitsE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPort9setParityENS_6ParityE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPort5clearE6QFlagsINS_9DirectionEE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPort11setStopBitsENS_8StopBitsE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPort11setBaudRateEi6QFlagsINS_9DirectionEE _ZN11QSerialPort5clearE6QFlagsINS_9DirectionEE/opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
 /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPortC1EP7QObject        /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPort11setBaudRateEi6QFlagsINS_9DirectionEE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPort11setDataBitsENS_8DataBitsE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPortC1EP7QObject_ZN11QSerialPort5errorENS_15SerialPortErrorE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
       _ZN11QSerialPort16staticMetaObjectE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
 /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
_ZN11QSerialPort11setPortNameERK7QString_ZN11QSerialPort11setDataBitsENS_8DataBitsE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
 _ZN11QSerialPort5errorENS_15SerialPortErrorE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so
/opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so_ZN11QSerialPort16staticMetaObjectE /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.so

_ZN11QSerialPort11setPortNameERK7QStringld:  /opt/qt5/qt5-build/qtserialbus/lib/libQt5SerialBus.sofatal: symbol referencing errors

ld: fatal: symbol referencing errors

SGaist

"-skip qtserialbus" for example.

Looks like your machine goes too fast :-D

Try building the qtserialport module before qtserialbus

You can use "make -C qtserialport" and then go on with your build.

Michele31415

@SGaist That worked:

/opt/qt5/qt5-build $ gmake -C qtserialport
gmake: Entering directory '/opt/qt5/qt5-build/qtserialport'
cd src/ && ( test -e Makefile || /opt/qt5/qt5-build/qtbase/bin/qmake -o Makefile /opt/qt5/qtserialport/src/src.pro -qtconf /opt/qt5/qt5-build/qtbase/bin/qt.conf -- -opensource -nomake examples -nomake tests -platform solaris-g++ ) && gmake -f Makefile 
gmake[1]: Entering directory '/opt/qt5/qt5-build/qtserialport/src'
cd serialport/ && ( test -e Makefile || /opt/qt5/qt5-build/qtbase/bin/qmake -o Makefile /opt/qt5/qtserialport/src/serialport/serialport.pro -qtconf /opt/qt5/qt5-build/qtbase/bin/qt.conf -- -opensource -nomake examples -nomake tests -platform solaris-g++ ) && gmake -f Makefile 
gmake[2]: Entering directory '/opt/qt5/qt5-build/qtserialport/src/serialport'
gmake[2]: Nothing to be done for 'first'.
gmake[2]: Leaving directory '/opt/qt5/qt5-build/qtserialport/src/serialport'
gmake[1]: Leaving directory '/opt/qt5/qt5-build/qtserialport/src'
gmake: Leaving directory '/opt/qt5/qt5-build/qtserialport'
/opt/qt5/qt5-build $

I'm doing the gmake over again without -j anything. Even though I don't think -j16 is particularly ambitious, sometimes it gets ahead of itself. It just takes forever with only one CPU on the job.

SGaist

What I do is usually start with multithreaded and if it fails go back to single threaded, fix the issue and start again with multithreaded.

Michele31415

I've started doing that too. In any case, with this:

/opt/qt5/qt5-build $ ../configure  -opensource -nomake examples -nomake tests -platform solaris-g++ -skip qtserialbus

we're now going much further but are not there yet.

/opt/qt5/qtbase/src/tools/moc/moc.cpp: In member function ‘void Moc::parseSlots(ClassDef*, FunctionDef::Access)’:
/opt/qt5/qtbase/src/tools/moc/moc.cpp:1049:18: warning: this statement may fall through [-Wimplicit-fallthrough=]
 1049 |             error("'using' directive not supported in 'slots' section");
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/qt5/qtbase/src/tools/moc/moc.cpp:1050:9: note: here
 1050 |         default:
      |         ^~~~~~~
/opt/qt5/qtbase/src/tools/moc/moc.cpp: In member function ‘void Moc::parseSignals(ClassDef*)’:
/opt/qt5/qtbase/src/tools/moc/moc.cpp:1103:18: warning: this statement may fall through [-Wimplicit-fallthrough=]
 1103 |             error("'using' directive not supported in 'signals' section");
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/qt5/qtbase/src/tools/moc/moc.cpp:1104:9: note: here
 1104 |         default:
      |         ^~~~~~~

Honestly, this error is mystifying.

SGaist

That one is just a warning. Does it error out on this warning ?

Michele31415

Hah! That joke's on me. (From now on I'll search for "error:" instead of just "error") Here's the real error:

...
In file included from /opt/qt5/qt3d/src/3rdparty/assimp/code/StreamReader.h:48,
                 from /opt/qt5/qt3d/src/3rdparty/assimp/code/AssimpPCH.h:151,
                 from /opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp:48:
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp: In instantiation of ‘std::size_t Assimp::Copy(uint8_t*, T&) [with T = short unsigned int; std::size_t = long unsigned int; uint8_t = unsigned char]’:
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp:93:44:   required from here
/opt/qt5/qt3d/src/3rdparty/assimp/code/ByteSwap.h:207:36: error: lvalue required as unary ‘&’ operand
  207 | # define AI_BE(t) ByteSwap::Swapped(t)
      |                   ~~~~~~~~~~~~~~~~~^~~
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp:85:22: note: in expansion of macro ‘AI_BE’
   85 |   std::memcpy(data, &AI_BE(field), sizeof(field)); return sizeof(field);
      |                      ^~~~~
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp: In instantiation of ‘std::size_t Assimp::Copy(uint8_t*, T&) [with T = unsigned int; std::size_t = long unsigned int; uint8_t = unsigned char]’:
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp:94:44:   required from here
/opt/qt5/qt3d/src/3rdparty/assimp/code/ByteSwap.h:207:36: error: lvalue required as unary ‘&’ operand
  207 | # define AI_BE(t) ByteSwap::Swapped(t)
      |                   ~~~~~~~~~~~~~~~~~^~~
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp:85:22: note: in expansion of macro ‘AI_BE’
   85 |   std::memcpy(data, &AI_BE(field), sizeof(field)); return sizeof(field);
      |                      ^~~~~
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp: In instantiation of ‘std::size_t Assimp::Copy(uint8_t*, T&) [with T = int; std::size_t = long unsigned int; uint8_t = unsigned char]’:
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp:108:42:   required from here
/opt/qt5/qt3d/src/3rdparty/assimp/code/ByteSwap.h:207:36: error: lvalue required as unary ‘&’ operand
  207 | # define AI_BE(t) ByteSwap::Swapped(t)
      |                   ~~~~~~~~~~~~~~~~~^~~
/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp:85:22: note: in expansion of macro ‘AI_BE’
   85 |   std::memcpy(data, &AI_BE(field), sizeof(field)); return sizeof(field);
      |                      ^~~~~
gmake[4]: *** [Makefile:2840: .obj/Bitmap.o] Error 1
gmake[4]: Leaving directory '/opt/qt5/qt5-build/qt3d/src/plugins/sceneparsers/assimp'
gmake[3]: *** [Makefile:44: sub-assimp-make_first] Error 2
gmake[3]: Leaving directory '/opt/qt5/qt5-build/qt3d/src/plugins/sceneparsers'
gmake[2]: *** [Makefile:446: sub-plugins-sceneparsers-make_first] Error 2
gmake[2]: Leaving directory '/opt/qt5/qt5-build/qt3d/src'
gmake[1]: *** [Makefile:46: sub-src-make_first] Error 2
gmake[1]: Leaving directory '/opt/qt5/qt5-build/qt3d'

JonB

@Michele31415 said in QT5 build: CC: No such file or directory:

/opt/qt5/qt3d/src/3rdparty/assimp/code/Bitmap.cpp: In instantiation of ‘std::size_t Assimp::Copy(uint8_t*, T&) [with T = short unsigned int; std::size_t = long unsigned int; uint8_t = unsigned char]’:

I couldn't help searching :) https://github.com/ros/meta-ros/issues/526, in 2017

assimp: "error: lvalue required as unary '&' operand" on mips, mips64 and ppc

| /home/lukas/work/repositories/yoctoproject.org/poky/build/tmp/work/mips32r2-poky-linux/assimp/3.1.1-r0/assimp-3.1.1/code/Bitmap.cpp: In instantiation of 'std::size_t Assimp::Copy(uint8_t*, T&) [with T = short unsigned int; std::size_t = unsigned int; uint8_t = unsigned char]':

Dunno what you're supposed to do about it though? :)

I think your error has also been reported in this forum:
Qt 5.7.1 build in Debian (MIPS) fails.

@SGaist was going to deal with that topic back in 2017 :)