Re: [Caml-list] Suggested way to determine platform specific capabilities in build system?

["Daniel Bünzli" <daniel.buenzli@erratique.ch>]

Le mardi, 14 avril 2015 à 12:51, Malcolm Matalka a écrit :
> What is the current suggested way to determine what, roughly, autoconf
> would do for you? I have some platform specific functionality to be
> included (or excluded) depending on the OS.

I don't know if there's a suggested way but here are various ways to proceed.

If you are using ocamlbuild, you can use `Sys.win32` since 4.01.0 or `Sys.os_type = "Win32"` to determine if you are on windows and otherwise get the (stripped and lowercased) result of `uname -s`, see e.g (but it's missing the win bit):  

https://github.com/dbuenzli/tsdl/blob/master/myocamlbuild.ml#L6

If you are using Makefiles you may want include `$(ocamlc -where)/lib/ocaml/Makefile.config` and use the `$SYSTEM` variable.

If this is only needed for C stubs you can also try solve this at the CPP level — but I guess this can be quite brittle — see e.g (here again missing the win bit as it's undefined for now):  

https://github.com/dbuenzli/mtime/blob/master/src-os/mtime_stubs.c#L11-L21

In any case make sure the value can be overridden from the command line for cross compilation scenarios.  

Best,

Daniel