DSO missing from command line [duplicate]
DSO here means Dynamic Shared Object; since the error message says it’s missing from the command line, I guess you have to add it to the command line. That is, try adding -lpthread to your command line.
undefined-reference
How to properly link libraries with cmake?
My recommendation is to start simple, and then complicate your project further. Let me try to explain how linking works in CMake. The idea is that you build modules in CMake, and link them together. Let’s ignore header files for now, as they can be all included in your source files. Say you have file1.cpp, … Read more
C error: undefined reference to function, but it IS defined
How are you doing the compiling and linking? You’ll need to specify both files, something like: gcc testpoint.c point.c …so that it knows to link the functions from both together. With the code as it’s written right now, however, you’ll then run into the opposite problem: multiple definitions of main. You’ll need/want to eliminate one … Read more
Undefined symbols “vtable for …” and “typeinfo for…”?
If Obstacle is an abstract base class, then make sure you declare all its virtual methods “pure virtual”: virtual void Method() = 0; The = 0 tells the compiler that this method must be overridden by a derived class, and might not have its own implementation. If the class contains any non-pure virtual functions, then … Read more
Undefined reference to `sin` [duplicate]
You have compiled your code with references to the correct math.h header file, but when you attempted to link it, you forgot the option to include the math library. As a result, you can compile your .o object files, but not build your executable. As Paul has already mentioned add “-lm” to link with the … Read more
Undefined reference to sqrt (or other mathematical functions)
You may find that you have to link with the math libraries on whatever system you’re using, something like: gcc -o myprog myprog.c -L/path/to/libs -lm ^^^ – this bit here. Including headers lets a compiler know about function declarations but it does not necessarily automatically link to the code required to perform that function. Failing … Read more
What is an undefined reference/unresolved external symbol error and how do I fix it in Fortran?
A link-time error like these messages can be for many of the same reasons as for more general uses of the linker, rather than just having compiled a Fortran program. Some of these are covered in the linked question about C++ linking and in another answer here: failing to specify the library, or providing them … Read more
Undefined reference to `pow’ and `floor’
You need to compile with the link flag -lm, like this: gcc fib.c -lm -o fibo This will tell gcc to link your code against the math lib. Just be sure to put the flag after the objects you want to link.
libpthread.so.0: error adding symbols: DSO missing from command line
You should mention the library on the command line after the object files being compiled: gcc -Wstrict-prototypes -Wall -Wno-sign-compare -Wpointer-arith -Wdeclaration-after-statement -Wformat-security -Wswitch-enum -Wunused-parameter -Wstrict-aliasing -Wbad-function-cast -Wcast-align -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-field-initializers -Wno-override-init \ -g -O2 -export-dynamic -o utilities/ovs-dpctl utilities/ovs-dpctl.o \ lib/libopenvswitch.a \ /home/jyyoo/src/dpdk/build/lib/librte_eal.a /home/jyyoo/src/dpdk/build/lib/libethdev.a /home/jyyoo/src/dpdk/build/lib/librte_cmdline.a /home/jyyoo/src/dpdk/build/lib/librte_hash.a /home/jyyoo/src/dpdk/build/lib/librte_lpm.a /home/jyyoo/src/dpdk/build/lib/librte_mbuf.a /home/jyyoo/src/dpdk/build/lib/librte_ring.a /home/jyyoo/src/dpdk/build/lib/librte_mempool.a /home/jyyoo/src/dpdk/build/lib/librte_malloc.a \ -lrt -lm -lpthread … Read more
What is an undefined reference/unresolved external symbol error and how do I fix it?
Compiling a C++ program takes place in several steps, as specified by 2.2 (credits to Keith Thompson for the reference): The precedence among the syntax rules of translation is specified by the following phases [see footnote]. Physical source file characters are mapped, in an implementation-defined manner, to the basic source character set (introducing new-line characters … Read more