Compilers and assemblers generate relocatable object files.
Compilers generate assembly code, assemblers generate binary code.
**Linkers generate executable object files. **
Key point here is Linkers generate executable object files (assembly code come from compilers and assemblers
Different system has different ways of organizing object files (Windows uses Portable Executable (PE) format. Mac OS-X uses the Mach-O format.
Modern x86-64 Linux and Unix systems use Executable and Linkable Format
Although different format organized the file differently, basic concept are similar.
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