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In my CMakeList.txt, there is ${PROJECT_SOURCE_DIR} but I don't know the exact values it represents. So I enter something like "echo ${PROJECT_SOURCE_DIR}", but nothing comes out. My questions are:
1. how to find out what ${xxx} represents?
2. are there differences between ${} and $()?
@Wolf gave the correct answer.
For further reading please refer to the CMake documentation of the variables: http://www.cmake.org/Wiki/CMake_Useful_Variables
It's the src folder for your project, where your package.xml and CMakeLists.txt lies, e. g.
/home/your_username/catkin_ws/src/your_package_name
if your user is names "your_username" , your catkin workspace is named "catkin_ws" and lies directly in your home folder and your package is named "your_package_name"........
Asked: 2014-08-11 00:01:43 -0500
Seen: 5,013 times
Last updated: Aug 11 '14
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echois not a CMake command, and${PROJECT_SOURCE_DIR}is not an environment variable (so you can'techoit). If you want to print it, usemessage("PROJECT_SOURCE_DIR: ${PROJECT_SOURCE_DIR}")somewhere in yourCMakeLists.txt.Thank you @gvdhoorn, @BennyRe and @Wolf. The combination of your three answers is the perfect answer.
@gvdhoom thank you for your answer, please once you use message("PROJECT_SOURCE_DIR: ${PROJECT_SOURCE_DIR}") where would it be displayed/printed ?
On the console, during CMake configuration phase.