add new variable %{ld_conf}%

[tuong]

When using the existing OCaml (system), opam install P could fail if the following conditions are encountered :

• P tries to write in $(ocamlc -where)/ld.conf,
• $(ocamlc -where)/ld.conf can only be read.

Here, opam init should copy $(ocamlc -where)/ld.conf to a writable file so that packagers could later refer to this file as %{ld_conf}%.

[samoht]

Do you know which package is trying to do that (ocamlfind apart)

Thomas

Le 25 sept. 2012 à 17:53, Frédéric Tuong notifications@github.com a écrit :

When using the existing OCaml (system), opam install P could fail if the following conditions are encountered :

P tries to write in $(ocamlc -where)/ld.conf,
$(ocamlc -where)/ld.conf can only be read.
Here, opam init should copy $(ocamlc -where)/ld.conf to a writable file so that packagers could later refer to this file as %{ld_conf}%.

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[tuong]

For instance camlzip which has the empty list as dependencies.

[samoht]

OPAM set LD_LIBRARY_PATH to point to ~/.opam/<alias>/lib/stublibs so normally you do not need to change ld.conf at all (ie. we should patch these packages to not do that).

For camlzip, I've added a META file, and I guess we should use a more complete .install file instead of using make install. So I'm closing this issue for now on, as copying ld.conf elsewhere is not the right solution to this problem.

[xavierleroy]

For the record: I think OPAM setting CAML_LD_LIBRARY_PATH is harmful and useless, see my comment here ocaml/ocaml#6532 (comment)