What is the in-place/Out-of-place builds
build, build-process, cmake
Solution
An in-place build generates the various compiled files (`.o`/`.obj` files, executables, &c.) in the same directory as the source tree.
An out-of-place build generates them in some directory that is not the source directory. This means that you can have several out-of-place builds that all point back to the same source tree, which is not possible once you have an in-place build.
See also: The CMake FAQ.
Problem
As in the title the questions is what is the difference between (in-place/Out-of-place builds)?