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If I didn't change any source file and run rosmake twice, I found that rosmake will also remake again. In this case it takes 2.66 sec,but in other it may cause longer. What's happened?
here is the log:
[rosmake-1] Starting >>> robot_setup_tf [ make ]
[rosmake-1] Finished <<< robot_setup_tf [PASS] [ 2.66 seconds ]
Let me see if I understand what you're asking: Why does ROS remake unchanged code when you perform two rosmakes in sequence?
The short answer-- it just does. rosmake acts the same as make, with some extras. It cycles through all your package's dependencies (and the package itself) to check if anything has changed.
'rosmake -s' will only build the package you specify, and not its dependencies. 'rosmake --pre-clean' will clean the specified package and all its dependencies before remaking all of them. 'rosmake -s --pre-clean' will clean and remake only the specified package.
Most likely it didn't actually build anything the second time. It takes a few seconds for it to figure out that it doesn't need to build again. That's probably what you are seeing.
Asked: 2011-07-05 01:30:34 -0500
Seen: 396 times
Last updated: Jul 05 '11
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