W14

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Week 14 Objectives

This Week

Read before Next Week

Forward Declaration

Declaration vs. Definition

Multifile Coding

Header File (filename.h) – “public” interface

Source File (filename.c) – “private” implementation

Multifile Compilation

gcc Compiler Driver

Object Files

Compiling All at Once (gcc does it all to create EOF)

Compile Separately (gcc builds individual ROF)

Makefiles

Example

Using

Relocatable Object Files (ROFs)

Executable and Linkable Format (ELF)

Static Linking

Static vs. Dynamic

Making Things Private

Linker Symbols

Linker Symbol Table

ELF_Symbol Data Members and their Use

Example readelf -s

Symbol Resolution

Compiler’s Resolution Work

Linker’s Resolution Work