???? ??? - (5) GCC

1
???? ???- (5) GCC

• Konkuk Univ.
• Dept. of Electronics

Konkuk Univ. Dept. of Electronics
2
GCC

• GCC(GNU C Compiler)
• GCC(GNU Compiler Collection) C, C, Java,
  Fortran, Ada, Objective-C/C
• GCC? ??? ???? 1987? GNU ????? ????? ????. GNU
  ????? ????? ??? ??? ? ??? ?? ????? ??? ?????.
• ?? ???? ????, ???? ????? ???? ??? ??? ? ?? ???
  ??? ?? ? ??? ??
• GCC 4.1 Alpha, ARM, Blackfin, H8/300,
  System/370, System/390, IA-32 (x86) and AMD64,
  IA-64 i.e. the "Itanium", Motorola 68000,
  Motorola 88000, MIPS, PA-RISC, PDP-11, PowerPC,
  SuperH, SPARC, VAX, Renesas R8C/M16C/M32C
  families, MorphoSys family
• gcc ? ????? ????? ?? ????? ???

Konkuk Univ. Dept. of Electronics
3
C compile ??

.c .cc .C
.o
.s
???? (preprocessor)
???? (compiler)
???? (assembler)
?? (linker)
.s
.o
a.out
Konkuk Univ. Dept. of Electronics
4
C compile ?? cont.

• C preprocessing (cpp) exgt define xx 100
• C compile (cc1) output) filename.s // assembly
  code
• Assemble (as) output) relocatable object file
• Link (ld) output) relocatable object file or
  executable file

Konkuk Univ. Dept. of Electronics
5
C compile ?? cont.

• ???(preprocessing)
• define, include, if? ?? ??? ??? ??
• ??? ??? ?? c ????? ??
• ???(compile)
• ?? ?? ?? ????? ?? ??? ???? ??? ??(.s)
• ????? ???? ??? ???? ?? ?? ????? ???
• ??? ???? ?? ??? ????? ?? ??? ???? ?? ??? ???

Konkuk Univ. Dept. of Electronics
6
C compile ?? cont.

• ???(assemble)
• ???? ??? ?? ??? ???? ??? ??(.o)
• ???? ?? gas ????? ???
• ????? ???(CPUOS)?? ??? ?? ?? ???? ?? ??
• ??(linking)
• ???? ??? ??? ?? ??? ??(.o)
• ????? ??? ? ???? ???
• ??? ?? ld ????? ??

Konkuk Univ. Dept. of Electronics
7
GCC file name

• gcc ? C compiler ? ? ??? assembler ? ??????? ??.
• gcc ? ??? ?? ???? ??? ? ??.
• .c preprocessingC compilerassemblelink
• .i C compiler assemblelink
• .s preprocessingassemblelink
• .S assemblelink

Konkuk Univ. Dept. of Electronics
8
GCC ??

Konkuk Univ. Dept. of Electronics
9
C preprocessing

Konkuk Univ. Dept. of Electronics
10
Make

• make ??
• Makefile? ???? ???? ???? ??? ???(????)? ???? ???
  ?? ????
• ?? ??? ??? ??(??)? ???? ??? ???? ???? ?? ?? ??
• ????? ?? ??? ?? ?? ??

Konkuk Univ. Dept. of Electronics
11
GCC options

• -o OPTION
• ??(output) ???? ??? ?????.
• gcc -o hello hello.c hello.c?? ??? hello?? ?????
  ??
• -E OPTION
• Preprocessing ??? compile
• -c OPTION
• ???(compile) ??? ?? ?? ??
• gcc -c hello.c hello.c ???? .c? ???? hello.o??
  ???? ??? ??
• -I OPTION
• include ???? ??? ?? ??? ???? ?? ??? ??
• gcc -c source.c Iinclude -I? ???

Konkuk Univ. Dept. of Electronics
12
GCC options cont.

• g OPTION
• ???? ??????? ??? ??? ??
• gcc g o hello hello.c
• -O OPTION
• ??? ???(optimization)
• -O2? ?? ?? ???, -O -O1, -O0?? ?? ???? ?? ??,
  ??? -O1
• -l OPTION
• ?? ?????? ????? ??
• -L OPTION
• ? ?????? ?? ????? ??? ?? ?

Konkuk Univ. Dept. of Electronics
13
make Makefile

• ?? ?? ??
• ???? ?? ?? ? ??? ???.
• ex) (CC) gcc
• Test label? ????? foo.o, main.o ??? ?? ????? ?
• foo.c, main.c? ??? ?? ??? ??
• make clean? ???? ???? label

Makefile
Konkuk Univ. Dept. of Electronics
14
make Makefile cont.

main.c
execute make
foo.c
Konkuk Univ. Dept. of Electronics