Copyright 2002 Dept. of Computer Science and Engineering, Washington University

CS 342: Build Control

Overview of the Build Process Make

reads Makefile Targets, Macros, Rules

invokes compiler and linker

Compiler Invokes preprocessor Parses result Produces object files

Linker Links references within

object files Produces executable

make

.cc.cc.cc

Makefile

preprocessor

.cc.cc.cc.cc.cc.h

linker.cc.cc.ocompiler

executableobject files

processedsource files

source files

Copyright 2002 Dept. of Computer Science and Engineering, Washington University

CS 342: Build Control

The make Utility Controls the build process

Enforces dependencies If something changes, update what depends on it (e.g.,

object files depend on header and body files)

Relies on file update times Can touch a file to set its time stamp to now

touch Calculator.cc

Builds targets First one declared in Makefile is the default

Usually want this to build the executable file

Can build other targets: e.g., make clean

Copyright 2002 Dept. of Computer Science and Engineering, Washington University

CS 342: Build Control

Example MakefileCMPL_SRCS = main.cc Calculator.cc Trace.cc

EXECUTABLE = calc_test

OBJS = $(CMPL_SRCS:.cc=.o)

$(EXECUTABLE): $(OBJS)

g++ -o $(EXECUTABLE) -Wall -W -g -DUNIX $(OBJS)

clean:

-rm -f $(OBJS) core *.bak *~

.cpp.o:

$(COMPILE.cc) -Wall -W -g -DUNIX $(OUTPUT_OPTION) $