[ros-users] ROS C Turtle Alpha 5 released

[Dan Lazewatsky]

I've noticed similar confusion from less experienced folks about when  
to clean. Is there a reason that rosmake doesn't run make clean by  
default? We're going to be setting up one of our computer labs with  
ROS for the fall semester, and I'm wondering if I should alias rosmake  
to rosmake --pre-clean to avoid the inevitable slew of emails from  
frantic students.

-Dan
On Jul 14, 2010, at 12:54 PM, Jack O'Quin wrote:

> On Mon, Jul 12, 2010 at 7:40 PM, Ken Conley <kwc at willowgarage.com>  
> wrote:
>> More information here:
>>
>> http://www.ros.org/news/2010/07/ros-c-turtle-alpha-5-released.html
>>
>>  -- your friendly neighborhood ROS C Turtle team
>
> We have been upgrading many of our students from boxturtle to cturtle.
> The binary installs seem to work fine. But several students stumbled
> over problems of binary incompatibility for external packages built
> with the two releases.
>
> After installing the cturtle packages, they update $ROS_PACKAGE_PATH
> and try to run their code. It generally segfaults, and they don't know
> what to do (these are smart, but relatively inexperienced
> undergraduates).
>
> Even running rosmake again does not work. Apparently, the build
> subtree is full of incompatible files. So, they need to at least use
> the rosmake --pre-clean option. I've been recommending that they check
> out a whole new tree and build that.
>
> So, this is not a big deal, but I was surprised how much confusion it
> created. It should probably be documented somehow in the release
> notes.
>
> If it were possible for rosmake and rosrun to detect packages built
> with the old ABI and issue a clear warning, that would help a lot.
> Even better if rosmake could automatically do the right thing (e.g.
> "make clean && make").
>
> I consider this more of a documentation issue than a defect, but
> probably many more users will stumble over it soon.
> -- 
>  joq
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