Original bug ID: 5095
Reporter: gsutre
Assigned to: @xclerc
Status: closed (set by @xavierleroy on 2012-03-24T14:01:43Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 3.12.0+beta1 or 3.12.0+rc1
Fixed in version: 3.12.1+dev
Category: -for ocamlbuild use https://github.com/ocaml/ocamlbuild/issues
Monitored by: @ygrek

Bug description

Consider the following example:

$ cat _tags
<.cmo>: pp(foo)
<.cmx>: pp(foo)
$ ocamlbuild -classic-display A.cmo A.cmx
/usr/pkg/bin/ocamldep.opt -modules A.ml > A.ml.depends
/usr/pkg/bin/ocamlc.opt -c -o A.cmo A.ml
/usr/pkg/bin/ocamlopt.opt -c -pp foo -o A.cmx A.ml

Here, the pp(foo) tag is ignored for the *.cmo declaration, but it is
used for the *.cmx declaration. Is this behavior intended? The code
says (ocaml_specific.ml):

pflag ["ocaml"; "compile"] "pp"
(fun param -> S [A "-pp"; A param]);

So I wonder why pp(foo) only applies to *.cmx.

Additional information

This bug report is extracted from the following message that I sent to the
caml mailing list:

http://caml.inria.fr/pub/ml-archives/caml-list/2010/06/f1c5394a6d6f0c4b50dc1fd176cac09d.en.html