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Makefile Tutorial CIS5027

Makefile Tutorial CIS5027 . Prof: Dr. Shu-Ching Chen TA: Hsin -Yu Ha. What’s make?. A utility that automatically builds  executable programs and libraries from  source code  by reading files called  makefile  which specify how to derive the target program .

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Makefile Tutorial CIS5027

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  1. Makefile TutorialCIS5027 Prof: Dr. Shu-Ching Chen TA: Hsin-Yu Ha

  2. What’s make? • Autility thatautomatically builds executable programs and libraries from source code by reading files called makefile which specify how to derive the target program. • Make allows you to manage large programs and keep track of which portion of the entire program have been changed. • Makefile tells make how to generate an execution file make make –f MyMakefile

  3. Compiling by hand • Build Process • Files: main.c foo1.c foo2.c • gccmain.c foo1.c foo2.c –o main • gccmain.c foo1.c foo2.c –c gccmain.o foo1.o foo2.o –o main • With make and makefile, you only need to type make

  4. Makefile Format • Target: The file we want to create • Dependencies: Check before creating the target file • Commands: Consider as shell script. Target : dependencies <Tab> system commands

  5. Dependency graph

  6. First Makefile make gccmain.c –c gcc foo1.c –c gccmain.ofool.o –o main

  7. Change one source file touch foo1.c make gcc foo1.c –c gccmain.ofool.o –o main

  8. Variables • $(VAR) or ${VAR} • For example Targets = foo ${Targets}: common.h gcc –o ${Targets} foo.c foo: common.h gcc –o foofoo.c

  9. Difference between :=, = and += x = fooy = $(x) barx = xyz# The value of y would be xyz bar x := fooy := $(x) barx := xyz# The value of y would be foo bar CFLAGS= -c CFLAGS+= -Wall

  10. Makefile Example

  11. Makefile Tutorial • Make manual • http://www.gnu.org/software/make/manual/make.html • 8 functions for transforming text • http://www.gnu.org/software/make/manual/html_node/Functions.html

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