[Relocatable] 7: Implement --enable-relative
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The Windows implementation caml_stat_strdup_to_utf16 returned NULL on OOM, where caml_stat_strdup raises Out_of_memory. Windows implementation fixed to raise Out_of_memory. caml_stat_strdup_noexc_to_os to be used in the one place in the runtime where NULL should in fact be returned.
Allows conversion of arbitrary char/wchar_t sequences by allowing the number of characters copied to be specified. The output length of the encoding can also be returned by these functions.
Computes the relative directory from --bindir to --libdir.
Returns an OCaml string as a char_os C string literal.
Converts an OCaml string in UTF-8 to a bytes consisting of the char_os representation of that string.
When linking an executable, allows extra global string values to be specified. In particular, this provides the ability to override caml_standard_library_default.
When configured with --enable-relative, the runtime uses the directory of the executable to determine the location of the Standard Library. Thus, ocamlrun and the compilers look for ../lib/ocaml by default. This is implemented by changing caml_standard_library_default to be a relative path, and then computing the actual value at startup (for bytecode) and when queried (for native, since it is only ever used if Dynlink is being used). Executables (and objects) produced by the compiler always have an absolute value of caml_standard_library_default. ocamlc.opt and ocamlopt.opt are built using -set-global-string to force caml_standard_library_default to stay a relative value.
In native code, Sys.interpreter is simply Sys.executable_name, but in bytecode it is the path to the actual interpreter (which will only be Sys.executable_name for -custom or -output-complete-* programs)
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PR sits on #158