Build Tool
A build tool operates on a set of packages
- determines the dependency graph
- invokes the specific build system for each package in topological order.
- for a specific package, knows how to setup the environment for it, invokes the build, and sets up the environment to use the built package.
The build system operates on a single package: CMake, Make, Python setuptools. catkin and ament_cmake are based on CMake
Dependency Graph
find_packagehelps the graph.FindFoo.cmakeorFindFoo.cmakefor the dependency must be in a prefix that CMake searches implicitly, like/usr, or a location provided through env varsCMAKE_PREFIX_PATH, orCMAKE_MODULE_PATHCMAKE_MODULE_PATH- Install a shared_lib in a non-default location, that location needs to be in
LD_LIBRARY_PATH.
