! -g - - PowerPoint PPT Presentation

• CS2141 – Software Development using C/C++

Compiling a C++ Program 2

• #include <iostream>

using namespace std; int main( ) { cout << “Hello world!” << endl; }

g++ hello.C

• a.out

./a.out Compiling a C++ Program 3

• o

> g++ -o hello hello.C > ./hello Hello world!

!

• g
• Wall!

" > g++ -g -Wall -o hello hello.C

Compiling a C++ Program 4

• #"
• > g++ -o quack quack.C moo.C

$%

• c

> g++ -c quack.C > g++ -c moo.C

quack.omoo.o

Compiling a C++ Program 5

• %&

> g++ -o quack quack.o moo.o

"

> g++ -c quack.C > g++ -o quack quack.o moo.o

%

& %

Compiling a C++ Program 6

• 'g++ hello.C
• (hello.C

&

hello.C

hello.s

hello.o a.out

• )&

hello.ii

*

Compiling a C++ Program 7

• cpp hello.C > hello.ii
• +,

g++ -s hello.C

• g++ -c hello.C
• hello.C

hello.s

hello.o a.out

• )&

hello.ii

*

Compiling a C++ Program 8

• *$

+,&

• +,

#include$ #include <file.h>

• #include “file.h”

Compiling a C++ Program 9

• #include$
• ( &

(.

$

• #ifndef FILENAME_H

// If FILENAME_H is not defined ... #define FILENAME_H // ... then define FILENAME_H and ... ... // ... whatever else ... #endif // ... up until here.

Compiling a C++ Program 10

• hello.h"hello.C"main.C

hello.h#

• #ifndef HELLO_H

#define HELLO_H void hello( ); void goodbye( int ); #endif

Compiling a C++ Program 11

• hello.Chello.h

#include <iostream> using namespace std; #include “hello.h” void hello( ) { cout << “Hello world!” << endl; } void goodbye( int n ) { for( int i = 0; i < n; ++i ) cout << “Goodbye!” << endl; }

Compiling a C++ Program 12

• main.C

#include “hello.h” int main( ) { hello( ); goodbye( 28 ); return 0; }

Compiling a C++ Program 13

• > g++ -c hello.C

> g++ -c main.C > g++ -o hello hello.o main.o

$

"

/&$

Makefile"

make

> make

Compiling a C++ Program 14

• &"

&&

target: dependencies (tab) command (tab) another command ... ...

# Compiling a C++ Program 15

• $&

hello: hello.C hello.h main.C g++ -o hello hello.C main.C

&

> make > ./hello Hello world! Goodbye! ...

$&

make$

Compiling a C++ Program 16

!

&

hello: hello.o main.o g++ -o hello hello.o main.o hello.o: hello.C hello.h g++ -c hello.C main.o: main.C hello.h g++ -c main.C

make$

Compiling a C++ Program 17

• 1&clean

$ %

# ... other targets ... clean: rm -f hello main.o hello.o

2"make

&clean"% make

> make clean

Compiling a C++ Program 18

"#

1&

3

$

VARIABLENAME = value

$

${VARIABLENAME}

!$

CXX EXEC CXXFLAGS

Compiling a C++ Program 19

$

CXX = g++ CXXFLAGS = -g EXEC = hello OBJS = hello.o main.o # List of object files needed to # build the executable. ${EXEC}: ${OBJS} ${CXX} ${CXXFLAGS}

• o ${EXEC} ${OBJS}

hello.o: hello.C hello.h ${CXX} ${CXXFLAGS}

• c hello.C

main.o: main.C hello.h ${CXX} ${CXXFLAGS}

• c main.C

clean: rm -f ${EXEC} ${OBJS}

Compiling a C++ Program 20

%#&

*.s1

*.s2"s1s2

$

• $<

$@ $^

.SUFFIXES: s1 s2 ... sn

Compiling a C++ Program 21

'

.SUFFIXES: .C .o CXX = g++ CXXFLAGS = -g EXEC = hello OBJS = hello.o main.o ${EXEC}: ${OBJS} ${CXX} ${CXXFLAGS}

• o ${EXEC} ${OBJS}

.C.o: # Abstract rule ${CXX} ${CXXFLAGS}

• c $<

# Still need to list the dependencies for object files hello.o: hello.C hello.h main.o: main.C hello.h clean: rm -f ${EXEC} ${OBJS}