On 2016-03-14 10:19, Mark Shinwell wrote:
There is a performance penalty with -g: it makes the raising of
exceptions slower (due to recording of backtraces). I think that may
be the only difference at present, though I'm not completely sure.
This penalty is only present with OCAMLRUNPARAM=b, which is now on by
default. This is a good thing, because lack of backtraces is something
100% of newcomers trip over; and anyone who dislikes the penalty
can trivially turn it off.
However, -g also inhibits some optimizations along with adding debug
info.
So it is still not free.
IMO there should be another option, something like -debug-info, that is
equivalent to -g but does not inhibit any optimizations. Then it would
be enabled by default.
Mark
On 13 March 2016 at 19:16, Ivan Gotovchits <[email protected]> wrote:
It looks like, that currently the `-g` option has no performance cost
at all (correct me if I’m wrong). Presumably, there is some increase
in the package size, but who cares. With these premises, I think it
would be a good policy to distribute packages with `-g` flag enabled.
On Mar 12, 2016, at 4:35 PM, Daniel Bünzli
<[email protected]> wrote:
Hello,
I'd like to know what the consensus is about distributing packages
that always compile in debug mode. It seems that some persons do want
to have debug always enabled [1,2], but the discussion is not clear
cut [1].
By default all my packages are released with -g disabled. It seems
easy enough to have an opam switch (even the official one) that
automatically enables the flag.
So I think OCaml's opam repository should have a policy here. The
answer should also take system package managers into account since
those pull directly from the tarballs (if this document [3] is still
in use for debian it seems they do require compilation with debug
mode).
Personally I don't have an opinion about it, I'm rather seeking an
answer here.
Best,
Daniel
[1] http://caml.inria.fr/mantis/view.php?id=6728
[2] http://rgrinberg.com/blog/2016/02/26/opam-package-checklist/
[3]
http://pkg-ocaml-maint.alioth.debian.org/ocaml_packaging_policy.html/c305.html#AEN307
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