问题
I'm having a problem building a library. In the Makefile I tell g++ that I need tclstub8.6 by putting -ltclstub8.6, and g++ takes it into account (sorry for these messages in French):
make: AVERTISSEMENT : le fichier « ../Linux-PORT/i586-GCC4/Makefile » a une date de modification 609 s dans le futur
*** Compile c [gcc] libtestGuiMnt_info.Linux-PORT.i586-GCC4.c
*** Compile C++ [g++] mntdisplay.cc
*** Compile C++ [g++] mntogl.cc
mntogl.cc: In member function 'virtual int MNTOgl::Display() const':
mntogl.cc:228:12: warning: unused variable 'ErrorCheckValue' [-Wunused-variable]
*** Compile C++ [g++] mntdisplaylist.cc
*** Compile C++ [g++] mntmanager.cc
*** Compile C++ [g++] mntdisplay_wrap.cc
*** Link (g++) librairie partagée /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1 -Wl,-Bdynamic -L/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib -Wl,-rpath,/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib -lapcomutil -lapmntcom -lapmntdata -lapmntnoyau -lapcomenvEtude -lapcomenv -ltclstub8.6 -lGLEW -lGLU -lGL -lglut
make: AVERTISSEMENT : décalage d'horloge détecté. La construction peut être incomplète.
But when I call a tcl function, a segfault occurs.
In fact if I check the library I just built with ldd -r command, it shows that every external library is included, except tclstub8.6.
Below is the output messages of ldd -r command. Note that libtclstub8.6 does not appear..
And the list ends with all undefined symbols of libtclstub8.6.
ldd -r /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1
linux-gate.so.1 (0xb777e000)
libapcomutil.2 => /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libapcomutil.2 (0xb7743000)
libapmntcom.1 => /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libapmntcom.1 (0xb773f000)
libapmntdata.3 => /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libapmntdata.3 (0xb770f000)
libapmntnoyau.4 => /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libapmntnoyau.4 (0xb76e9000)
libapcomenvEtude.1 => /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libapcomenvEtude.1 (0xb76cc000)
libapcomenv.1 => /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libapcomenv.1 (0xb76b8000)
libGLEW.so.1.9 => /usr/lib/libGLEW.so.1.9 (0xb762e000)
libGLU.so.1 => /usr/lib/libGLU.so.1 (0xb75a6000)
libGL.so.1 => /usr/lib/libGL.so.1 (0xb7546000)
libglut.so.3 => /usr/lib/libglut.so.3 (0xb750a000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb741e000)
libm.so.6 => /lib/libm.so.6 (0xb73dc000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb73be000)
libc.so.6 => /lib/libc.so.6 (0xb7244000)
libapcomfichier.3 => /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libapcomfichier.3 (0xb7235000)
libapcomitineraire.3 => /apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libapcomitineraire.3 (0xb7190000)
libxml2.so.2 => /usr/lib/libxml2.so.2 (0xb7036000)
libz.so.1 => /lib/libz.so.1 (0xb701f000)
libgfortran.so.3 => /usr/lib/libgfortran.so.3 (0xb6f22000)
libglapi.so.0 => /usr/lib/libglapi.so.0 (0xb6f0c000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xb6ef9000)
libXdamage.so.1 => /usr/lib/libXdamage.so.1 (0xb6ef5000)
libXfixes.so.3 => /usr/lib/libXfixes.so.3 (0xb6eef000)
libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0xb6eeb000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xb6db1000)
libxcb-glx.so.0 => /usr/lib/libxcb-glx.so.0 (0xb6d98000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0xb6d75000)
libXxf86vm.so.1 => /usr/lib/libXxf86vm.so.1 (0xb6d6f000)
libdrm.so.2 => /usr/lib/libdrm.so.2 (0xb6d61000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb6d45000)
libdl.so.2 => /lib/libdl.so.2 (0xb6d40000)
libXi.so.6 => /usr/lib/libXi.so.6 (0xb6d30000)
libXrandr.so.2 => /usr/lib/libXrandr.so.2 (0xb6d25000)
/lib/ld-linux.so.2 (0xb777f000)
liblzma.so.5 => /usr/lib/liblzma.so.5 (0xb6cfb000)
libquadmath.so.0 => /usr/lib/libquadmath.so.0 (0xb6c82000)
libXau.so.6 => /usr/lib/libXau.so.6 (0xb6c7e000)
libXrender.so.1 => /usr/lib/libXrender.so.1 (0xb6c73000)
undefined symbol: Tcl_DeleteCommandFromToken (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_NewStringObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_GetCommandInfo (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_SetObjResult (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_GetLongFromObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_InitHashTable (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_CreateObjCommand (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_NewBooleanObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_SetResult (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_GetStringResult (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_SetVar (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_VarEval (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_GetVar (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_AppendResult (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_AppendElement (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_ObjSetVar2 (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_ResetResult (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_SetErrorCode (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_PkgProvide (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: _ZN10MNTManager10DisplayAllEv (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_GetStringFromObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_NewDoubleObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_GetBooleanFromObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_GetObjResult (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: TclFreeObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_GetDoubleFromObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_DuplicateObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_DeleteHashEntry (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
undefined symbol: Tcl_NewIntObj (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
Could someone help me with this issue? Thank you very much!
回答1:
I found it.
In fact everything was because of this line:
undefined symbol: _ZN10MNTManager10DisplayAllEv (/apollo/Developpement/Build-GCC4/Obj/Linux-PORT/i586-GCC4/lib/libtestGuiMnt.1)
There is an undefined symbol of MY library. I defined it and problem solved!
Please see my original post: segfault using SWIG converted code for tcl
The confusion was, my program crashed in the middle of tcl wrapper functions (where my undefined symbol was not involved at all). I don't really know why but that's it..
Hope it will help others!
来源：https://stackoverflow.com/questions/18379452/c-linked-library-disappears-and-gives-segfault-during-execution