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Wed, 14 September 2011 08:34

Eclipse User

I am working with Eclipse Indigo.
I have two C++ projects.
The first project creates a library .a.
The second project uses this library and creates a binary at the end.

Is it possible (and which steps do I have to do) to get the following:

When debugging the second project.

1) I would like to debug into the libraries code.
2) If I change something in the libraries code, I would like to have it build and linked automatically when I restart debugging of the second project.

Thank you very much for your help.
Georg

Re: Library question [message #725935 is a reply to message #725285]

Fri, 16 September 2011 04:25

Eclipse User

The first should be possible just out of the box, as long the second project links to the library with debugger information.
The second can be complicated. I use cygwin, g++ and have discovered strange behavior. I have 4 open projects where one is the executable depending on the other 3 which are static libraries. The exe project referes to lib1 which again referes to the 2 other libs.
When I build the executable I get this
one library is not rebuild (That's okay because I have made no changes)
second library is build all the times (No matter if I make changes to it or not)
the last library is created all the time no matter if I make changes to it or not, however if I make changes, the source files are compiled too.
My conclusion is that Eclipse can't be used with cygwin unless for a simple "Hello world" project

Re: Library question [message #727113 is a reply to message #725935]

Tue, 20 September 2011 08:41

Eclipse User

What I found out:
To create a static library select:

File → new Project → C++ Project

Select further:

Static library / Empty project

Enter a library's name.
Add some header and source files.

If you compile the project you get:

/Debug/libNAME.a
/Release/libNAME.a

Importing the library

(Now we want to use the library created earlier)
Create a new C / C++ Project.

Add the used headerfiles of the library in the code e.g.: (#include <myTestLib.h>)

You need to enter the following settings for Release and Debug.

Libraries -l

Enter the library without lib____.a only the name! For example the library in the Debug folder is libmyTestLib.a, you need to enter myTestLib only.

Library search path -L

Enter the path where the library is located.

C/C++General / Path and Symbols/ Includes
Needs to point to the headerfiles of the lib. Do this for GNU C and GNU C++

During debugging a project which includes a library you need sometimes to edit the code of the library. If you set a reference to the library, it is built automatically before you start a new debugging session. Do this for Release and Debug. Set a reference as the following:
Path and Symbols -> References -> select Lib project Release or Debug

That's it
Georg

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