makefile - two executables

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July 3rd, 2002, 01:22 PM

lux

Senior Member

Join Date: Jul 2001

Posts: 42

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makefile - two executables

i'm trying to create a makefile which will give two executables, but i'm having some problems. this is my makefile

Code:

CCC = g++  
EXEC1 = HEncode
EXEC2 = HDecode
OBJ1  = main.o HEncode.o Tree.o Node.o
OBJ2  = main.o HDecode.o Tree.o Node.o

all:      $(EXEC1) $(EXEC2)

$(EXEC1): $(OBJ1)
	$(CCC) $(OBJ1) -o $(EXEC1)

$(EXEC2): $(OBJ2)
	$(CCC) $(OBJ2) -o $(EXEC2)

main.o: main.cc
HEncode.o: HEncode.cc HEncode.h
HDecode.o: HDecode.cc HDecode.h
Tree.o: Tree.cc Tree.h
Node.o: Node.cc Node.h

which gives me the following error:

Code:

g++   main.o HEncode.o Tree.o Node.o -o HEncode
Undefined                       first referenced
 symbol                             in file
HDecode::decode(void)               main.o
HDecode::~HDecode(void)             main.o
HDecode::HDecode(basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> >)main.o
ld: fatal: Symbol referencing errors. No output written to HEncode
collect2: ld returned 1 exit status
make: *** [HEncode] Error 1

but if I change the all target line to:
all: $(EXEC2) $(EXEC1)

I get

Code:

g++    -c -o HDecode.o HDecode.cc
g++   main.o HDecode.o Tree.o Node.o -o HDecode
Undefined                       first referenced
 symbol                             in file
HEncode::encode(void)               main.o
HEncode::~HEncode(void)             main.o
HEncode::HEncode(basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> >)main.o
ld: fatal: Symbol referencing errors. No output written to HDecode
collect2: ld returned 1 exit status
make: *** [HDecode] Error 1

So I know it's a problem with my makefile.. besides, all the classes are pretty much empty..
so how do I create a makefile which will give two executables?

thanks for any help!!

July 3rd, 2002, 01:51 PM

Lord MJ

Contributing User

Join Date: Aug 2001

Posts: 34

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You'll want to create a Make target that calls two other targets.

The 2 targets will be the ones that create your two executables.

July 3rd, 2002, 01:54 PM

lux

Senior Member

Join Date: Jul 2001

Posts: 42

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I did that

all: $(EXEC1) $(EXEC2)

all calls the two targets, but I'm still getting errors

July 16th, 2002, 03:01 PM

chance

Junior Member

Join Date: Jun 2002

Posts: 4

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Are you sure the make file is the problem?

I think you may be telling the Makefile to do the wrong thing.

if you type

"g++ main.o HEncode.o Tree.o Node.o -o HEncode" on
command line do you get same error as if Makefile were used
to issue this command?

I'd guess you either don't have these functions defined that
g++ is griping about, or you need to pass some other option
to g++ to let it know where to find some kind of template.

makefile - two executables

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