How to link compiled object file (hello.o) with ld on Mac OS X?

Question

I got a problem with link objective files on a Mac OS X. Tracing back the problem is, here is my C hello world program

#include <stdio.h>
int main(){
    printf("Hello, world!\n");
    return 0;
}

//Compile with gcc (clang LLVM compiler on mac)

$ gcc -c hello.c

The output file is hello.o link with gcc and run the executable is

$ gcc hello.o -o hello
$ ./hello

Now, I have to use the mac linker program ld or Ld to link the the objective files instead of gcc. In this case, what arguments should I pass into the ld program in order to get the program run? A simple pass in the object file name, i.e.

$ ld hello.o

resulting in

ld: warning: -macosx_version_min not specified, assuming 10.6
Undefined symbols for architecture x86_64:
    "_printf", referenced from:
     _main in hello.o
    "start", referenced from:
    implicit entry/start for main executable
ld: symbol(s) not found for inferred architecture x86_64

So what other files that i need to include to link or architecture information that I need to specify? Thanks.

Solution

For a reference, my complete linker options are

ld -demangle -dynamic -arch x86_64 
-macosx_version_min 10.9.0 
-o hello
-lSystem /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/5.0/lib/darwin/libclang_rt.osx.a

Comments

[shock_one]

The manual of my ld says -dynamic is the default. Also it doesn't have the -demangle option. Linking worked without these two for me.

[Xophmeister]

I found that -lSystem is enough: you don't need to explicitly include libclang_rt.osx.a and -arch and -macosx_version_min are given defaults (with a warning) if omitted.