I am working on an assignment for my System Programming course which is a course using the linux terminal and C language. I own a mac and already require a windows VM for my other courses so I have no room for the linux machine and my professor said that my mac machine would work fine as it has the linux terminal.
We have to create a makefile file that will compile and link the c project together and create a .bin file, which is the basis of programming C in a linux environment, but I am getting errors with my makefile.
I believe it has to do with the difference between Linux and MacOS but I am not sure.
My makefile is as follows:
./bin/cryptoMagic: ./obj/main.o
cc ./obj/main.o -o ./bin/cryptoMagic
./obj/main.o: ./src/main.c ./inc/prototypes.h
cc ./src/main.c -c -o ./obj/main.o
When I run the make utility in the terminal I get this error message:
kyles-MacBook-Pro:~ KyleJensen$ cd Documents/School/First\ Year/Semester2/SystemProgramming/Assignments/Assign01/
kyles-MacBook-Pro:Assign01 KyleJensen$ make
cc ./obj/main.o -o ./bin/cryptoMagic
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: *** [bin/cryptoMagic] Error 1
Silly me. I didn't have a valid main function in my C file. Watch out for this one in the future kids!
Related
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 am new to coding and C++ and have just installed C++ and XCode on my computer. I have made Mac OSX GCC my preferred tool chain.
I can't seem to even get a simple Hello World program to run, I really need some help here, I've posted before and looked around but nothing seems to help me.
Code:
#include <iostream>
using namespace std;
int main() {
cout << "Hello world \n";
return 0;
}
Error after clicking on build all:
12:38:22 **** Incremental Build of configuration Debug for project Test1 ****
make all
Building file: ../test.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"test.d" -MT"test.o" -o "test.o" "../test.cpp"
Finished building: ../test.cpp
Building target: Test1
Invoking: MacOS X C++ Linker
g++ -o "Test1" ./test.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: *** [Test1] Error 1
12:38:37 Build Finished (took 15s.286ms)
You mentioned that you just installed XCode. If you are looking to get started with C++ programming, using XCode will make your experience more satisfying and learning curve faster than if you use Eclipse. XCode is a "native" IDE on Mac.
Having said this, I understand there may be reasons to use Eclipse, e.g. if you expect to start programming on non-Apple platforms in a very near future, or want to familiarize yourself with Eclipse as the IDE to do Android programming. However, if you are going to be on Mac for awhile and want to pick up C++ faster, I would strongly recommend sticking with XCode.
Now, the error you show could be because the file has not been saved, as suggested by one of the commenters. That's exactly the error you get if main() is missing.
First, I create a c++ console project.
Then, I download the lua5.2.0 from lua.org, then make the lib use [make macosx test] and got the liblua.a.
Finally, I import the lua src into project and drag the liblua.a in project, write some demo code and compile,but get the link error, I confirm there has no grammar error.
Ld /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Products/Debug/LuaAdapter normal x86_64
cd /Users/luocaixin/Desktop/xcodeWS1/LuaAdapter
export MACOSX_DEPLOYMENT_TARGET=10.10
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -L/Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Products/Debug -L/Users/luocaixin/Desktop/xcodeWS1/LuaAdapter/Lua.5.2.0/src -F/Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Products/Debug -filelist /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/LuaAdapter.LinkFileList -mmacosx-version-min=10.10 -stdlib=libc++ -llua -Xlinker -dependency_info -Xlinker /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/LuaAdapter_dependency_info.dat -o /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Products/Debug/LuaAdapter
duplicate symbol _main in:
/Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/lua.o
/Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/luac.o
duplicate symbol _main in:
/Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/lua.o
/Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/main.o
ld: 2 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I want to know what cause this error and how to import lua in xcode c++
project correctly.
Did you read the error? It's telling you what's wrong: you have more than one main function. You've included two object files that contain a main function (lua, luac) and probably have one in your test app, too. You need to leave those files out of your project. They are the reference command line interpreter and compiler, respectively. You don't include them if you're embedding Lua as a library.
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.
I am doing some testing today and was searching for a command line program that would allow me to extract files out of tcp traffic, I seem to have found one called tcpxtract, however when I try to compile it, I get the following error on make
Undefined symbols for architecture i386:
"_yywrap", referenced from:
_yylex in confl.o
_input in confl.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status
make: *** [tcpxtract] Error 1
What can I do to get it to compile?
I'm on a Macbook Pro Retina Early 2013 running 0SX 10.8.4
You need to link with -lfl (the flex library). Make sure it's after your object files.
Edit your Makefile after running configure. Go down to the line that says
LIBS = -lpcap
(circa line 130)
and change it to:
LIBS = -lpcap -ll
It should then build.