Compilers: Principles and Practice by Pearson

20 Compilers – Principles and Practice

c

pre-processing (invokes cpp),

c

compilation,

c

assembly (invokes as), see Fig. 1.17,

c

linking (invokes ld), see Fig. 1.18.

Fig. 1.18 gcc: The linker converts an obj file to an executable

myprog.c

myprog.o

gcc

X86 m/c code

myprog.o

myprog

Linker Id

X86 m/c code

myprog.c

myprog.s

gcc

X86 m/c code

myprog.s

myprog.o

Assembler as

X86 m/c code

Fig. 1.17 gcc converts from C to obj using assembler

In gcc, the level of attempted optimization controlled by -0 and other switches, but you have to be

careful, specially for embedded and Device-driver codes.

In the subsequent chapters, we shall refer to GCC for indicating how relevant ...