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ocamldep generates the list of dependencies of a given OCaml target file. The new -build-tree option adds a facility to add a (separate) prefix to the targets and the dependencies in its make output. This allows make to write targets in an other location than just the current working directory. Dependencies of the target that are also build artifacts are also found in this location. This is useful for out-of-source builds and cross-compilation. ocamldep outputs a trailing directory separator if the given string doesn't contain one, and respects -slash and -no-slash options. No other processing is made on the string. It is for instance possible to give a Makefile variable instead of a path.
If ocamldep is invoked without `-all`, then the output doesn't refer to source files and there is no need for `-source-tree`. If `-all` is used, though, then rules output by ocamldep will refer to source files and, currently, they will contain the paths to the source files relative to where ocamldep is run from. Defining `-source-tree` allows to run the build from a different directory than of which ocamldep was run.
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Previous submission at
https://github.com/ocaml/ocaml/pull/12239.