I know this is an old post, but I am trying to do what you did here but I am getting the below error. May you please help, I am new to VLC-Qt thing.
Thank you.
C:/Qt/5.15.0/mingw81_32/include/QtCore/qmetatype.h:1590: undefined reference to `VlcQmlPlayer::staticMetaObject'
debug/main.o: In function `ZN18QMetaTypeIdQObjectIP12VlcQmlPlayerLi8EE14qt_metatype_idEv':
C:/Qt/5.15.0/mingw81_32/include/QtCore/qmetatype.h:1951: undefined reference to `VlcQmlPlayer::staticMetaObject'
debug/main.o:main.cpp:(.rdata$_ZTVN11QQmlPrivate11QQmlElementI12VlcQmlPlayerEE[__ZTVN11QQmlPrivate11QQmlElementI12VlcQmlPlayerEE]+0x8): undefined reference to `VlcQmlPlayer::metaObject() const'
debug/main.o:main.cpp:(.rdata$_ZTVN11QQmlPrivate11QQmlElementI12VlcQmlPlayerEE[__ZTVN11QQmlPrivate11QQmlElementI12VlcQmlPlayerEE]+0xc): undefined reference to `VlcQmlPlayer::qt_metacast(char const*)'
debug/main.o:main.cpp:(.rdata$_ZTVN11QQmlPrivate11QQmlElementI12VlcQmlPlayerEE[__ZTVN11QQmlPrivate11QQmlElementI12VlcQmlPlayerEE]+0x10): undefined reference to `VlcQmlPlayer::qt_metacall(QMetaObject::Call, int, void**)'
debug/main.o: In function `ZN11QQmlPrivate11QQmlElementI12VlcQmlPlayerED1Ev':
C:/Qt/5.15.0/mingw81_32/include/QtQml/qqmlprivate.h:144: undefined reference to `VlcQmlPlayer::~VlcQmlPlayer()'
Related
How to get variable from shared library?
I get error library.so udefined symbol: ...
but actually symbol is defined in shared library.
I have build some code using LibSerial but when i compile it i have this error messages:
/tmp/ccUpE4te.o: In function `main':
test.c:(.text+0x8d): undefined reference to `LibSerial::SerialStream::Open(std::string, std::_Ios_Openmode)'
test.c:(.text+0xbf): undefined reference to `LibSerial::SerialStream::SetBaudRate(LibSerial::SerialStreamBuf::BaudRateEnum)'
test.c:(.text+0xd3): undefined reference to `LibSerial::SerialStream::SetCharSize(LibSerial::SerialStreamBuf::CharSizeEnum)'
test.c:(.text+0xe7): undefined reference to `LibSerial::SerialStream::SetNumOfStopBits(short)'
test.c:(.text+0xfb): undefined reference to `LibSerial::SerialStream::SetFlowControl(LibSerial::SerialStreamBuf::FlowControlEnum)'
test.c:(.text+0x10f): undefined reference to `LibSerial::SerialStream::SetVTime(short)'
test.c:(.text+0x123): undefined reference to `LibSerial::SerialStream::SetVMin(short)'
test.c:(.text+0x1a1): undefined reference to `LibSerial::SerialStream::Open(std::string, std::_Ios_Openmode)'
test.c:(.text+0x1d3): undefined reference to `LibSerial::SerialStream::SetBaudRate(LibSerial::SerialStreamBuf::BaudRateEnum)'
test.c:(.text+0x1e7): undefined reference to `LibSerial::SerialStream::SetCharSize(LibSerial::SerialStreamBuf::CharSizeEnum)'
test.c:(.text+0x1fb): undefined reference to `LibSerial::SerialStream::SetNumOfStopBits(short)'
test.c:(.text+0x20f): undefined reference to `LibSerial::SerialStream::SetFlowControl(LibSerial::SerialStreamBuf::FlowControlEnum)'
test.c:(.text+0x223): undefined reference to `LibSerial::SerialStream::SetVTime(short)'
test.c:(.text+0x237): undefined reference to `LibSerial::SerialStream::SetVMin(short)'
/tmp/ccUpE4te.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[_ZTVN9LibSerial15SerialStreamBufE]+0x48): undefined reference to `LibSerial::SerialStreamBuf::showmanyc()'
/tmp/ccUpE4te.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[_ZTVN9LibSerial15SerialStreamBufE]+0x50): undefined reference to `LibSerial::SerialStreamBuf::xsgetn(char*, long)'
/tmp/ccUpE4te.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[_ZTVN9LibSerial15SerialStreamBufE]+0x58): undefined reference to `LibSerial::SerialStreamBuf::underflow()'
/tmp/ccUpE4te.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[_ZTVN9LibSerial15SerialStreamBufE]+0x68): undefined reference to `LibSerial::SerialStreamBuf::pbackfail(int)'
/tmp/ccUpE4te.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[_ZTVN9LibSerial15SerialStreamBufE]+0x70): undefined reference to `LibSerial::SerialStreamBuf::xsputn(char const*, long)'
/tmp/ccUpE4te.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[_ZTVN9LibSerial15SerialStreamBufE]+0x78): undefined reference to `LibSerial::SerialStreamBuf::overflow(int)'
collect2: error: ld returned 1 exit status
I believe that they are linking errors but i cannot understand how i can solve my problem.
Solution: "gcc -L/usr/local/lib -lserial test.c"
What this solution means?
gcc doesn't know about the libraries you wish to use. You should tell him.
The gcc flag "-l" is the way telling gcc that you want to link to a library installed on you computer.
In your case you should specify: "-lserial"
Another thing you will need to do is to let g++ know where to find this library.
Assuming you didn't make anything special the libaray will be found under /usr/local/lib and will be named libserial.so
You can tell gcc where you keep your libraries by adding another flag "-L" (it should be -L/usr/local/lib) or you can use the local variable to do so:
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
I get the following compilation error in Monodevelop:
Error CS0121: The call is ambiguous between the following methods or properties:
'System.Linq.Enumerable.ToArray<AudioBitrateCalculationStream>(this System.Collections.Generic.IEnumerable<AudioBitrateCalculationStream>)' and
'System.Linq.Enumerable.ToArray<AudioBitrateCalculationStream>(this System.Collections.Generic.IEnumerable<AudioBitrateCalculationStream>)' (CS0121)
Both definitions are exactly the same. I cannot understand what the issue is. Internet search does not help.
I am trying to create a custom TCL interpreter with TclPro according instructions at TclPro User's Guide Chapter 7, but it fails with linking error undefined reference to __ctype_b.
I have downloaded and installed TclPro 1.4 at /opt/ajuba/TclPro1.4/, and here is the custom interpreter I want to build:
// file simple.cpp
#include <proWrap.h>
int main( int argc, char** argv )
{
Pro_WrapTclMain( argc, argv, &Tcl_Init );
return 0;
}
So it does nothing but calls Pro_WrapTclMain with standard Tcl_Init.
I am trying to build simple.cpp with this command:
g++ -DNDEBUG -O3 -fpic -Wall -pedantic -I/opt/ajuba/TclPro1.4/include simple.cpp -static -Wl,-R/opt/ajuba/TclPro1.4/linux-ix86/lib -L/opt/ajuba/TclPro1.4/linux-ix86/lib -lwrapper1.4 -ltcl8.3 -o out
and here is the first error message I get (you can find the full log at the bottom):
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(envargs.o): In function `envargs':
envargs.c:(.text+0x1e): undefined reference to `__ctype_b'
Seems __ctype_b is a symbol which TclPro expects to be defined at libc.a, but
nm /usr/lib/libc.a | grep __ctype_b
gives
00000080 T __ctype_b_loc
so there is no __ctype_b defined at libc.a.
The question is: how to build a custom TCL interpreter with TclPro in this situation?
If __ctype_b should be defined at libc.a, then how can I obtain an appropriate libc.a?
Here is the full log of compilation:
g++ -DNDEBUG -O3 -fpic -Wall -pedantic -I/opt/ajuba/TclPro1.4/include simple.cpp -static -Wl,-R/opt/ajuba/TclPro1.4/linux-ix86/lib -L/opt/ajuba/TclPro1.4/linux-ix86/lib -lwrapper1.4 -ltcl8.3 -o out
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclUnixPipe.o): In function `TclpCreateTempFile':
tclUnixPipe.c:(.text+0xe0): warning: the use of `tmpnam' is dangerous, better use `mkstemp'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclUnixFCmd.o): In function `GetGroupAttribute':
tclUnixFCmd.c:(.text+0xb5b): warning: Using 'getgrgid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclUnixFCmd.o): In function `SetGroupAttribute':
tclUnixFCmd.c:(.text+0xd59): warning: Using 'getgrnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclUnixFCmd.o): In function `GetGroupAttribute':
tclUnixFCmd.c:(.text+0xba1): warning: Using 'endgrent' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclUnixFCmd.o): In function `SetOwnerAttribute':
tclUnixFCmd.c:(.text+0xe7d): warning: Using 'getpwnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclUnixFCmd.o): In function `GetOwnerAttribute':
tclUnixFCmd.c:(.text+0xc14): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
tclUnixFCmd.c:(.text+0xc5e): warning: Using 'endpwent' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclUnixChan.o): In function `TcpGetOptionProc':
tclUnixChan.c:(.text+0x8de): warning: Using 'gethostbyaddr' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclUnixChan.o): In function `CreateSocketAddress':
tclUnixChan.c:(.text+0xe4c): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclIOSock.o): In function `TclSockGetPort':
tclIOSock.c:(.text+0x47): warning: Using 'getservbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(envargs.o): In function `envargs':
envargs.c:(.text+0x1e): undefined reference to `__ctype_b'
envargs.c:(.text+0x5d): undefined reference to `__ctype_b'
envargs.c:(.text+0x193): undefined reference to `__ctype_b'
envargs.c:(.text+0x1c0): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(envargs.o): In function `count_args':
envargs.c:(.text+0x23d): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(envargs.o):envargs.c:(.text+0x29b): more undefined references to `__ctype_b' follow
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(fileio.o): In function `UzpMorePause':
fileio.c:(.text+0x9a8): undefined reference to `__ctype_tolower'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(fileio.o): In function `do_string':
fileio.c:(.text+0xf31): undefined reference to `__ctype_b'
fileio.c:(.text+0xf4a): undefined reference to `__ctype_tolower'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(fileio.o): In function `zstrnicmp':
fileio.c:(.text+0x120c): undefined reference to `__ctype_b'
fileio.c:(.text+0x1215): undefined reference to `__ctype_tolower'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(match.o): In function `recmatch':
match.c:(.text+0x127): undefined reference to `__ctype_tolower'
match.c:(.text+0x15f): undefined reference to `__ctype_b'
match.c:(.text+0x1ad): undefined reference to `__ctype_b'
match.c:(.text+0x24b): undefined reference to `__ctype_b'
match.c:(.text+0x264): undefined reference to `__ctype_tolower'
match.c:(.text+0x28d): undefined reference to `__ctype_b'
match.c:(.text+0x2a6): undefined reference to `__ctype_tolower'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libwrapper1.4.a(unix.o): In function `mapname':
unix.c:(.text+0x441): undefined reference to `__ctype_b'
unix.c:(.text+0x47b): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclIOUtil.o): In function `TclGetOpenMode':
tclIOUtil.c:(.text+0x36): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclListObj.o): In function `SetListFromAny':
tclListObj.c:(.text+0x7e6): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclLoad.o): In function `Tcl_LoadObjCmd':
tclLoad.c:(.text+0x3cc): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclObj.o):tclObj.c:(.text+0x7e8): more undefined references to `__ctype_b' follow
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclLoadDl.o): In function `TclpLoadFile':
tclLoadDl.c:(.text+0x35): undefined reference to `dlopen'
tclLoadDl.c:(.text+0x5a): undefined reference to `dlerror'
tclLoadDl.c:(.text+0xa1): undefined reference to `dlsym'
tclLoadDl.c:(.text+0xe0): undefined reference to `dlsym'
tclLoadDl.c:(.text+0x119): undefined reference to `dlsym'
tclLoadDl.c:(.text+0x158): undefined reference to `dlsym'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclLoadDl.o): In function `TclpUnloadFile':
tclLoadDl.c:(.text+0x19c): undefined reference to `dlclose'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclBinary.o): In function `Tcl_BinaryObjCmd':
tclBinary.c:(.text+0xbe4): undefined reference to `__ctype_b'
tclBinary.c:(.text+0xc5d): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclBinary.o): In function `GetFormatSpec':
tclBinary.c:(.text+0x1617): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclCmdAH.o): In function `Tcl_CaseObjCmd':
tclCmdAH.c:(.text+0x185): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclCmdAH.o): In function `Tcl_FormatObjCmd':
tclCmdAH.c:(.text+0x22f5): undefined reference to `__ctype_b'
/opt/ajuba/TclPro1.4/linux-ix86/lib/libtcl8.3.a(tclCmdAH.o):tclCmdAH.c:(.text+0x23f8): more undefined references to `__ctype_b' follow
collect2: ld returned 1 exit status
make: *** [out] Error 1
I don't know for sure what the details of your platform are, but this message would seem to hold the answer. In essence, you add this code to simple.cpp and recompile:
#include <ctype.h>
extern "C" {
__const unsigned short int **__wrap___ctype_b (void) {
return __ctype_b_loc();
}
}
You also apparently need to this option to the linking line: -Wl,--wrap,__ctype_b
Hope this helps...
I am getting the following error in my VC++ COM project. What is the problem in linking the lib files here?
Error 4 error LNK2019: unresolved external symbol _BVUOpen#8 referenced in function "unsigned int __stdcall AFunc(void *)" (?AFunc##YGIPAX#Z) CBillAcceptor.obj BillAcceptorCOM
Here are the explanation of the LNK2019 error : MSDN.
Look for a problem of definition about BVUOPen symbol ! The problem si inside the method AFunc Maybe, you haven't declare it correctly or haven't link the library or haven't export the symbol...
Probably, you need to link against some external library that contains the object code for the BVUOpen function. The name of that library is not obvious from your error message, but it should be possible to work out from the documentation you are coding from.