Relocatable ocamlbuild #2
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Makefile.config contains copies of PREFIX, BINDIR, LIBDIR and MANDIR from OCaml's Makefile.config. These values were not actually being used, and they become much less reliable with Relocatable OCaml. They've therefore been removed. OCAML_LIBDIR was previously a copy of LIBDIR from OCaml's Makefile.config. However, this file is found by running `ocamlc -where`, which itself _gives_ the value for OCAML_LIBDIR. For Relocatable OCaml, `ocamlc -where` is guaranteed to be correct, where the LIBDIR value may not be, so tweak the generation of Makefile.config to use this value instead.
In configure.make, specifying a path beginning ./ or ../ or OCAMLBUILD_LIBDIR enabled Relocatable ocamlbuild, as long as the ocamlbuild binary is being installed in the same directory as the compiler and the compiler itself is Relocatable OCaml. The relative path given for OCAMLBUILD_LIBDIR describes how to get from OCaml's Standard Library to the directory containing the "ocamlbuild" package directory (in opam, this is just ".."). In this mode, `ocamlbuild -where` is determined relative to the Standard Library.
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