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Community/Discussion/QNX Momentics Getting Started/Momentics and "QNX C/C++ Project" with multiple executables or libraries/List of Posts
Forum Topic - Momentics and "QNX C/C++ Project" with multiple executables or libraries: (9 Items)
   
Update
Lubos Omelina
01/28/2010 10:04 AM
post46125
Momentics and "QNX C/C++ Project" with multiple executables or libraries   
Hi,

I have created QNX C/C++ Project in momentics IDE. It generates one executable,but if i'm trying to add another file 
with main() into the project it ends with error.
Is it somehow posible to generate more executables or libraries from one QNX project?
I know, it can appear little wierd, but there is more reasons why one can need it (i.e. make test binaries which are 
fixed to projet - I don't want to create separate project only for tests)
I know I can write my own makefile which will do that, but I dont know how to do that in QNX type of project. Is it even
 posible?
Jeevan Mathew(deleted)
02/15/2010 1:11 PM
post47324
Re: Momentics and "QNX C/C++ Project" with multiple executables or libraries   
> Hi,
> 
> I have created QNX C/C++ Project in momentics IDE. It generates one executable
> ,but if i'm trying to add another file with main() into the project it ends 
> with error.
> Is it somehow posible to generate more executables or libraries from one QNX 
> project?
> I know, it can appear little wierd, but there is more reasons why one can need
>  it (i.e. make test binaries which are fixed to projet - I don't want to 
> create separate project only for tests)
> I know I can write my own makefile which will do that, but I dont know how to 
> do that in QNX type of project. Is it even posible?


http://www.qnx.com/developers/docs/6.4.1/neutrino/prog/make_convent.html

Edit common.mk and try with:

EXTRA_OBJS
    A space-separated list of object files to be added to the link/archive step even though they don't have 
corresponding source files (or have been excluded by EXCLUDE_OBJS). Default is none. 

Does it work ?

Have seen similar thing recently :-)
-Jeevan
Lubos Omelina
07/27/2010 8:17 AM
post60707
Re: Momentics and "QNX C/C++ Project" with multiple executables or libraries   
Little bit late, but ... thank you :)
sudhir katta
01/03/2012 1:43 PM
post90814
Re: Momentics and "QNX C/C++ Project" with multiple executables or libraries   
Same problem here.
In my project I have multiple test files that have main() in them. They compile to object files but I get linking error 
multiple definition of `main'.

As mentioned in this post I have added dependency as "EXTRA_OBJS:=dependency1.o dependency2.o" to my common.mk file but 
still I'm getting errors.

I appreciate your help.
Elena Laskavaia
01/03/2012 2:01 PM
post90815
Re: Momentics and "QNX C/C++ Project" with multiple executables or libraries   
You cannot have multiple main functions. How does linker suppose to choose the right one?
sudhir katta
01/03/2012 2:26 PM
post90819
Re: Momentics and "QNX C/C++ Project" with multiple executables or libraries   
Elena, Thanks for the reply. 
I have one main function in one file. In my project I have multiple c files each has only one main(). I can write a make
 file to build executable for each file but how can do the same in QNX IDE.

Lubos post explains very clearly the same thing.
Elena Laskavaia
01/03/2012 2:49 PM
post90820
Re: Momentics and "QNX C/C++ Project" with multiple executables or libraries   
IDE project builds one executable by default. You have to create custom makefile to build multiple executables.
It is easier if you create one project per executable
sudhir katta
01/03/2012 3:40 PM
post90821
Re: Momentics and "QNX C/C++ Project" with multiple executables or libraries   
From previous post I understand that by adding EXTRA_OBJS to common.mk I can make multiple executable in a project. 
I have added EXTRA_OBJS = object1.o object2.o to common.mk but it didn't work

Can you please give me an example how I can accomplish this.
Elena Laskavaia
01/03/2012 3:44 PM
post90822
Re: Momentics and "QNX C/C++ Project" with multiple executables or libraries   
No extra obj just add extra object files to the same executable. You have to read docs about recursive makefiles to see 
how to do it. It is very non-trivial. It is probably easier if you just write a standard makefile in this case.

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