build executable with msg

asked 2014-05-06 15:42:52 -0500

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I'm trying to build a source file using a message belonging to the same package.

In Package A - bb.cpp - cc.msg

The problem is that bb.cpp includes the header file of cc.msg - cc.h when I start to build as 'winros_make' it looks executables are built before the messages in there. i think messages should be built first and then executables be.

there are any way to build message first? so executable can access the header file of them.

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answered 2014-05-09 06:51:13 -0500

ahendrix

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You can add a dependency line to your CMakeLists.txt which declares that your executable depends on building messages:

add_dependencies(your_program ${your_package_EXPORTED_TARGETS})

For a more detailed explanation, see the building messages howto

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i solved it by adding this. add_dependencies(bb A_gencpp) thank you.

Younghyo ( 2014-05-12 16:25:07 -0500 )edit

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answered 2014-05-09 04:33:24 -0500

Bastbeat

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updated 2014-05-09 09:06:46 -0500

Try to delete your .cpp code from CMakelist
catkin_make or make (if you are in Catkin or in Rosbuild) to create correctly your "cc.h"
include again your .cpp in CMakelist
catkin_make or make again

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This is not a good idea, because you'll have to repeat it any time you want to change the message definitions in your package. It's much better to explicitly declare your message dependencies; your program will always build in order, and it will be automatically rebuilt when your msg files change.