Undefined reference C++
You may be compiling skewNormal.cpp to a .o file, but you’re not including it when you compile main.cpp.
undefined-reference
Undefined reference to mempcy@GLIBC_2.14 when compiling on Linux
The mempcy@GLIBC_2.14 is called a versioned symbol. Glibc uses them while other runtime libraries like musl do not. The significance of mempcy@GLIBC_2.14 when compiling on Linux is due to Glibc changing the way memcpy worked back in 2012. memcpy used to copy bytes {begin → end} (low memory address to high memory address). Glibc 2.13 … Read more
Undefined Reference to [duplicate]
Usually headers guards are for header files (i.e., .h ) not for source files ( i.e., .cpp ). Include the necessary standard headers and namespaces in source files. LinearNode.h: #ifndef LINEARNODE_H #define LINEARNODE_H class LinearNode { // ….. }; #endif LinearNode.cpp: #include “LinearNode.h” #include <iostream> using namespace std; // And now the definitions LinkedList.h: #ifndef … Read more
“undefined reference to” using ‘g++’ to compile a C++ program
Use g++ main.cpp Help.cpp You have to tell the compiler all the files that you want it to compile, not just the first one.
undefined reference to `__stack_chk_fail’
libgurobi_c++.a was compiled with -fno-stack-protector (obviously). A few things come to mind: add -fstack-protector when linking. This will make sure that libssp gets linked. Manually link -lssp Make your dummy version of __stack_chk_fail(void) in it’s own object file and and add this .o file to your linker command AFTER libgurobi_c++.a. GCC/G++ resolves symbols from left … Read more
undefined reference to template function [duplicate]
The implementation of a non-specialized template must be visible to a translation unit that uses it. The compiler must be able to see the implementation in order to generate code for all specializations in your code. This can be achieved in two ways: 1) Move the implementation inside the header. 2) If you want to … Read more
undefined reference to `__gxx_personality_sj0`
These functions are part of the C++ exception handling support for GCC. GCC supports two kinds of exception handling, one which is based on calls to setjmp and longjmp (sjlj exception handling), and another which is based on the DWARF debugging info format (DW2 exception handling). These sorts of linker errors will occur is you … Read more
C++ templates, undefined reference
You need to use the export keyword. However, I don’t think G++ has proper support, so you need to include the template function’s definition in the header so the translation unit can use it. This is because the <int> ‘version’ of the template hasn’t been created, only the <typename T> ‘version.’ An easy way is … Read more
gcc: undefined reference to
However, avpicture_get_size is defined. No, as the header (<libavcodec/avcodec.h>) just declares it. The definition is in the library itself. So you might like to add the linker option to link libavcodec when invoking gcc: -lavcodec Please also note that libraries need to be specified on the command line after the files needing them: gcc -I$HOME/ffmpeg/include … Read more
Undefined reference to `initscr’ Ncurses
You need to change your makefile so that the -lncurses directive comes after your object code on the gcc command line, i.e. it needs to generate the command: gcc -W -Wall -Werror -Wextra -I./Includes/. -o Sources/NCurses/ncurses_init.o -c Sources/NCurses/ncurses_init.c -lncurses This is because object files and libraries are linked in order in a single pass.