Commits on Mar 15, 2017

1. Respect OCAML_COLOR environment variable for deciding whether to use … …

   …colors
   
   Since 4.03, OCaml supports coloring its messages to standard output and standard
   error, depending on the "-color" argument ({always,never,auto}).  This commit
   adds support for the environment variable "OCAML_COLOR" (which value can as well
   be {always,never,auto}).
   
   The command line argument "-color" takes precedence, "OCAML_COLOR" is only
   taken into consideration if no "-color" is provided.
   
   The motivation for this is that the user should have control over coloring
   OCaml's output messages.  OCamlbuild, a widely used build tool executes OCaml
   not under a tty (and OCaml does not colorize errors and warnings), which lead
   various packages use `color(always)` in their `_tags` files, which breaks with
   other (non-interactive) programs (i.e.  editor helpers).
   
   Further discussion was done at ocaml/ocamlbuild#87 and
   ocaml#1098.

   

   hannesm committed Mar 15, 2017
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