I'm trying to learn FLTK for C++ and I'm working on a Macbook with the clang++ compiler. Whenever I try to link the library like this:
clang++ -L/usr/local/lib -lfltk
It gives me this error:
clang: warning: argument unused during compilation: '-X11'
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I've looked on a couple other forums to see how to fix this problem and haven't gotten any answers that worked. I also tried reinstalling Command Line Tools from Apple's Developer site.
You have to make sure you put the linker command (-L/usr/local/lib -lfltk) before doing filename.cpp -o Exectuable but still in the same line in the command line.
Related
I've been trying for hours to get Boost C++ libraries working on MacOS 10.13.6.
I'm up-to-date with Xcode and Homebrew.
I used brew install boost to install boost and followed the Boost Getting Started instructions for help with compiling.
I've tried everything that I can think of and read every post I can find on StackOverflow about this.
I'm attempting to compile with:
g++ -std=c++17 -stdlib=libc++ -I /usr/local/opt/boost/include -L /usr/local/opt/boost/lib ass3.cpp -o ass3 -lboost_filesystem
and I get the following error message:
Undefined symbols for architecture x86_64: "boost::system::detail::generic_category_ncx()", referenced from: boost::system::generic_category()
in ass3-3dc386.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I haven't yet tried to install Boost from source.
If I exclude -std=c++17 the code will compile with a warning that I am using c++11 alias. As I get further into my project I'll be using c++17 specific features so I need to include this as far I as I know.
Compiler warning:
warning: alias declarations are a C++11 extension [-Wc++11-extensions]
What am I missing?
Basic Info:
system: macOS High Sierra(10.13.6)
editor : vs code(latest version)
Compiler: g++ (Xcode)
Target：deploy GLFW + GLAD
Question Description:
Recently, I'm learning to do some Computer Graphics related work. Everything is going smooth. However, when i create a window to test the env.Link error happened:
Undefined symbols for architecture x86_64:
"_gladLoadGLLoader", referenced from:
_main in main-5c211c.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
The terminal process terminated with exit code: 1
It seems I have not link some third party file. I
have fixed exactly the same problem by add "-lglfw" args to g++ when using functions in glfw3.h.
But when meeting glad related function : gladLoadGLLoader, I don't know how to do.
Something I have done:
Can find the head file.
#include glad/glad.h
#include GLFW/glfw3.h
Have put the file "glad.c" in workspace.
Try to Add "g++ -framework XXXXX" , But doesn't work.
Try to Add "g++ -lglfw3", But doesn't work.
Add "g++ -L or I /usr/lib or /usr/local/lib or /usr/local/include", But doesn't work.
Just tell the g++ to compile glad.c by adding "glad.c" to args. I thought glad.c will be compiled by default. Although I am not clear what happened, the problem is resolved anyway.
Add glad.c into Build Phases->Compile Sources
I'm trying to use libuvc in one of my C/C++ projects. I succesfully compiled and installed both libusb and libuvc from source and when I attempt to compile the following code using gcc:
#include "libuvc/libuvc.h"
int main (int argc, const char **argv) {
uvc_init(NULL, NULL);
}
I get the following error:
Undefined symbols for architecture x86_64:
"_uvc_init", referenced from:
_main in main-de2855.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I'm on MacOS High Sierra 10.13.1 x64.
I used the command:
gcc main.c -luvc -o main
and it worked! Adding the -luvc flag solved my problem, but I don't understand why I need to use it. I've never needed flags before when working with other C/C++ dependencies.
First of all I want to say I realise this has been asked a dozen times, and I've read countless solutions without any luck so therefore I'm asking again.
I'm using OS X Mavericks 10.9.5, writing in Sublime 3 and compiling using terminal with g++
I'm trying to compile this simple file (test.cpp)
#include <iostream>
#include <SDL2/SDL.h>
int main () {
if(SDL_Init(SDL_INIT_VIDEO)) {
std::cout << "I made it this far" << std::endl;
}
return 0;
}
Compiler line :
g++ test.cpp
This returns the error :
Undefined symbols for architecture x86_64:
"_SDL_Init", referenced from:
_main in test-ebbae4.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
So, I've tried adding a lot of different flags, -m32 only changes the result to throw Undefined symbols for architecture i386: and ld: symbol(s) not found for architecture i386
I've tried different -arch variations, but I can't seem to get it to work. also played around with -l -I flags but I'm not sure I know what they do/how they could help..
Does anyone have a clue what to do next?
EDIT : Some additional information. I've tried using the .framework for SDL2, that didn't change anything, currently I'm using SDL2 installed through compilation of the source. Headers located in usr/local/SDL2
g++ test.cpp
You should specify the SDL library, too:
g++ test.cpp -lsdl2
You might need to include a path if its not well known to the compiler driver:
g++ test.cpp -L/path/to/the/library -lsdl2
Heres the code, extremely basic Cpp
#include <iostream>
using namespace std;
int main(){
cout << "C++ is FUN!\n";
return 0;
}
The symbols that can not be found are "std" trying to use the name space, and "cout".
the full error message is.
make: *** [FirstProject] Error 1 FirstProject C/C++ Problem
Symbol 'cout' could not be resolved FirstProgram.cpp /FirstProject line 5 Semantic Error
Symbol 'std' could not be resolved FirstProgram.cpp /FirstProject line 2 Semantic Error
symbol(s) not found for architecture x86_64 FirstProject C/C++ Problem
EDIT:
here is the whole linker line:
make all
Building target: FirstProject
Invoking: Cross G++ Linker
g++ -o "FirstProject" ./FirstProgram.o
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [FirstProject] Error 1
Does anyone know what could potentially be the problem?
You are not compiling using a C++ compiler.
If you are using the GNU toolchain then use g++ and not gcc.
You need to compile then link:
g++ -c -o FirstProgram.o FirstProgram.c
g++ -o FirstProject FirstProgram.o
Or you can combine into one statement:
g++ -o FirstProject FirstProgram.c