Xcode - Linker command failed with exit code 1 (use -v to see invocation) - Xcode

Question

I have a problem when I try to compile my program. Do not think it's the code. Create a project so Xcode gives me the main code, it I'm not using, instead create a new file called Triangulo.cpp, I just want to compile this file to see if it works.

This is the text that appears after trying to compile.

Ld /Users/oscarespinosa/Library/Developer/Xcode/DerivedData/Poligonos_2D-folpbuxmhfipkuadwfzchugbzton/Build/Products/Debug/Poligonos\ 2D normal x86_64
cd "/Users/oscarespinosa/Documents/Ingenieria Aeronautica/2do Semestre/Programacion Orientada a Objetos/Poligonos 2D"
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/oscarespinosa/Library/Developer/Xcode/DerivedData/Poligonos_2D-folpbuxmhfipkuadwfzchugbzton/Build/Products/Debug -F/Users/oscarespinosa/Library/Developer/Xcode/DerivedData/Poligonos_2D-folpbuxmhfipkuadwfzchugbzton/Build/Products/Debug -filelist /Users/oscarespinosa/Library/Developer/Xcode/DerivedData/Poligonos_2D-folpbuxmhfipkuadwfzchugbzton/Build/Intermediates/Poligonos\ 2D.build/Debug/Poligonos\ 2D.build/Objects-normal/x86_64/Poligonos\ 2D.LinkFileList -mmacosx-version-min=10.10 -stdlib=libc++ -Xlinker -dependency_info -Xlinker /Users/oscarespinosa/Library/Developer/Xcode/DerivedData/Poligonos_2D-folpbuxmhfipkuadwfzchugbzton/Build/Intermediates/Poligonos\ 2D.build/Debug/Poligonos\ 2D.build/Objects-normal/x86_64/Poligonos\ 2D_dependency_info.dat -o /Users/oscarespinosa/Library/Developer/Xcode/DerivedData/Poligonos_2D-folpbuxmhfipkuadwfzchugbzton/Build/Products/Debug/Poligonos\ 2D

duplicate symbol _main in:
/Users/oscarespinosa/Library/Developer/Xcode/DerivedData/Poligonos_2D-folpbuxmhfipkuadwfzchugbzton/Build/Intermediates/Poligonos 2D.build/Debug/Poligonos 2D.build/Objects-normal/x86_64/main.o
/Users/oscarespinosa/Library/Developer/Xcode/DerivedData/Poligonos_2D-folpbuxmhfipkuadwfzchugbzton/Build/Intermediates/Poligonos 2D.build/Debug/Poligonos 2D.build/Objects-normal/x86_64/Triangulo.o
ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Here is the code:

//
//  Triangulo.cpp
//  Poligonos 2D
//
//  Created by Oscar Espinosa on 4/6/15.
//  Copyright (c) 2015 IPN ESIME Ticoman. All rights reserved.
//

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
int b, h;
float c, a, area, perimetro;

cout << " Calculo de area y perimetro de un triangulo rectangulo" << endl
     << "\n Ingrese el valor de la base: ";
cin >>  b;
cout << "\n Ingrese el valor de la altura: ";
cin >> h;

area = (b*h)/2.00;

c = sqrt(b*b + h*h);
a = c;
perimetro = a+b+c;

cout << "\n El area es: " << area << endl
     << " El perimetro es: " << perimetro;

return 0;
}

I can't really tell what it is without code but it looks like you may be trying to use #include improperly. Make sure you're not including the same class multiple times on the same document. — Scott
– Scott, Commented Apr 7, 2015 at 20:48
Just test it in D ++ on Windows and it works, but in Xcode not. :/ — Oscar Espinosa
– Oscar Espinosa, Commented Apr 7, 2015 at 21:19
You have duplicate _main symbols. By default, xcode makes a main.c in your project. — ort11
– ort11, Commented Apr 7, 2015 at 21:25

w0mbat · Accepted Answer · 2015-04-07 21:29:58Z

1

Your project accidentally has a source file which is called "main.c" (or .m or .cpp) which also has a function called "main". Remove that extra file from the project. It's probably starter code that came when you created the project from a template.

answered Apr 7, 2015 at 21:29

w0mbat

2,4611 gold badge17 silver badges17 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

w0mbat Over a year ago

No problem, I've got lots of points anyway. Glad I could help.

saurabh Over a year ago

@OscarEspinosa Just accept the answer if it solves your problem.

Collectives™ on Stack Overflow

Xcode - Linker command failed with exit code 1 (use -v to see invocation) - Xcode

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related