libc和crt1.o是静态链接还是动态链接？

Question

I'm really just trying to get my head around static and dynamic linking.

When I invoke a compilation driver like unix> gcc myfile.c , crt1.o and libc.a (or libc.dylib ) are linked to produce the executable by ld . I want to guess that crt.o is linked statically and the standard C lib is linked dynamically. Yes?

Thanks for help. I think I may need a new text on linking :S `

Answer 1

want to guess that crt.o is linked statically and the standard C lib is linked dynamically. Yes?

No.

Not exactly.

crt0.o and its family ( bundle1.o , dylib1.o , etc.) are object files, not libraries, they are not linked at all. libc.a is a static library so when you link against it, it will be linked statically (ie the object files it contains will be essentially copied to your executable). Static libraries aren't, however, linked themselves either. libc.dylib is a dynamically linked library - guess how it is linked when you use it (dynamically, of course, and in this case, the library itself is a linked, proper executable file).