Problems with constructors

[saneman]

I am trying to compile the program from this page:

http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-helloworld.html

I use this makefile:

all: main

main: helloworld.h helloworld.cc main.cc
g++ main.cc -o main `pkg-config gtkmm-2.4 --cflags --libs`

But when I compile I get:

/tmp/ccPWqvDE.o: In function `main':
main.cc:(.text+ 0x37): undefined reference to `HelloWorld::He lloWorld()'
main.cc:(.text+ 0x54): undefined reference to `HelloWorld::~H elloWorld()'
main.cc:(.text+ 0x67): undefined reference to `HelloWorld::~H elloWorld()'
collect2: ld returned 1 exit status
make: *** [main] Error 1

But I don't understand why since the constructors are specified.

[Martin York]

Re: Problems with constructors

On Mar 30, 9:31 am, saneman <d...@sdf.comwr ote:

I am trying to compile the program from this page:
>
http://www.gtkmm.org/docs/gtkmm-2.4/...sec-helloworld...
>
I use this makefile:
>
all: main
>
main: helloworld.h helloworld.cc main.cc
g++ main.cc -o main `pkg-config gtkmm-2.4 --cflags --libs`
>
But when I compile I get:
>
/tmp/ccPWqvDE.o: In function `main':
main.cc:(.text+ 0x37): undefined reference to `HelloWorld::He lloWorld()'
main.cc:(.text+ 0x54): undefined reference to `HelloWorld::~H elloWorld()'
main.cc:(.text+ 0x67): undefined reference to `HelloWorld::~H elloWorld()'
collect2: ld returned 1 exit status
make: *** [main] Error 1
>
But I don't understand why since the constructors are specified.

This is not a problem with your code but a problem with what you are
building.
Your code is in two files main.cc and helloworld.cc but you are only
building main.cpp

You should probably drop a note to a group that can help you get your
makefile set up correctly. As a temporary solution change the build
line to:



g++ main.cc helloworld.cc -o main `pkg-config gtkmm-2.4 --
cflags --libs`

Notice: ^^^^^^^^^^^^

[saneman]

Re: Problems with constructors

Alf P. Steinbach wrote:

* saneman:

>I am trying to compile the program from this page:
>>
>http://www.gtkmm.org/docs/gtkmm-2.4/...elloworld.html
>>
>>
>I use this makefile:
>>
>all: main
>>
>main: helloworld.h helloworld.cc main.cc
> g++ main.cc -o main `pkg-config gtkmm-2.4 --cflags --libs`
>>
>But when I compile I get:
>>
>/tmp/ccPWqvDE.o: In function `main':
>main.cc:(.text +0x37): undefined reference to `HelloWorld::He lloWorld()'
>main.cc:(.text +0x54): undefined reference to `HelloWorld::~H elloWorld()'
>main.cc:(.text +0x67): undefined reference to `HelloWorld::~H elloWorld()'
>collect2: ld returned 1 exit status
>make: *** [main] Error 1
>>
>But I don't understand why since the constructors are specified.

>
You have forgotten 'helloworld.cc' in the compilation command.
>
>
Cheers, & hth.,
>
- Alf
>

Ah is there someway to split this up in to targets or is this offtopic?