Bug#627761: marked as done (provide a way to use legacy custom linking)
Your message dated Wed, 25 May 2011 07:50:15 +0000
with message-id <E1QP8r9-00044b-63@franck.debian.org>
and subject line Bug#627761: fixed in ocaml 3.12.0-6
has caused the Debian Bug report #627761,
regarding provide a way to use legacy custom linking
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
627761: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=627761
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
Package: ocaml
Version: 3.12.0-5
Severity: normal
It appears that the new "-output-obj" style strategy for generating
-custom bytecode executables
(cf. patches/0011-Embed-bytecode-in-C-object-when-using-custom.patch)
has broken the normal usage of stack backtraces in such executables.
We have a large OCaml application that links with a number of
native-code libraries; we use native-code compilation for most
purposes, but also use byte compilation specifically to support
debugging. In particular we run with OCAMLRUNPARAM=b to get stack
backtraces from uncaught OCaml exceptions.
When I upgraded to the latest Debian OCaml packages, this stopped
working. Now when I try to run a ELF-wrapper-around-bytecode
executable with the environment variable OCAMLRUNPARAM=b to debug an
exception, I see the error message
(Program not linked with -g, cannot print stack backtrace)
even though I did, in fact, compile the program with "-g". It appears
this is because read_debug_info() is searching for debugging
information in the executable and not finding it.
After looking through the OCaml source code, I found that a
combination of undocumented features can be used to provide an
inconvenient workaround to this problem. The relevant debugging
information is being created at link time, but it appears that it is
stored in a file with an unpredictable name in /tmp, with the
extension .cds. Though the file names like "/tmp/camlobjfe90df.cds"
sound like temporary files that would be deleted at the end of
compilation, they are not deleted; I currently have more than 100 such
files (taking more than 250MB) in /tmp. If I supply the undocumented
CAML_DEBUG_FILE environment variable at runtime, pointing to the
correct .cds file, then backtraces work again. However I don't see any
proper way to find the correct filename; hacky things that work
include running ocamlc under "strace -eopen" and looking for the most
recent .cds file in /tmp.
The "strip"ping problem that appeared to motivate the new embedding
process had never bothered us, so another suitable workaround from our
perspective would be if there was a way to disable the
new "-output-obj"-style behavior.
-- Stephen
--- End Message ---
--- Begin Message ---
Source: ocaml
Source-Version: 3.12.0-6
We believe that the bug you reported is fixed in the latest version of
ocaml, which is due to be installed in the Debian FTP archive:
camlp4-extra_3.12.0-6_amd64.deb
to main/o/ocaml/camlp4-extra_3.12.0-6_amd64.deb
camlp4_3.12.0-6_amd64.deb
to main/o/ocaml/camlp4_3.12.0-6_amd64.deb
ocaml-base-nox_3.12.0-6_amd64.deb
to main/o/ocaml/ocaml-base-nox_3.12.0-6_amd64.deb
ocaml-base_3.12.0-6_amd64.deb
to main/o/ocaml/ocaml-base_3.12.0-6_amd64.deb
ocaml-compiler-libs_3.12.0-6_amd64.deb
to main/o/ocaml/ocaml-compiler-libs_3.12.0-6_amd64.deb
ocaml-interp_3.12.0-6_amd64.deb
to main/o/ocaml/ocaml-interp_3.12.0-6_amd64.deb
ocaml-mode_3.12.0-6_all.deb
to main/o/ocaml/ocaml-mode_3.12.0-6_all.deb
ocaml-native-compilers_3.12.0-6_amd64.deb
to main/o/ocaml/ocaml-native-compilers_3.12.0-6_amd64.deb
ocaml-nox_3.12.0-6_amd64.deb
to main/o/ocaml/ocaml-nox_3.12.0-6_amd64.deb
ocaml-source_3.12.0-6_all.deb
to main/o/ocaml/ocaml-source_3.12.0-6_all.deb
ocaml_3.12.0-6.debian.tar.gz
to main/o/ocaml/ocaml_3.12.0-6.debian.tar.gz
ocaml_3.12.0-6.dsc
to main/o/ocaml/ocaml_3.12.0-6.dsc
ocaml_3.12.0-6_amd64.deb
to main/o/ocaml/ocaml_3.12.0-6_amd64.deb
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to 627761@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Stéphane Glondu <glondu@debian.org> (supplier of updated ocaml package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Wed, 25 May 2011 07:40:01 +0200
Source: ocaml
Binary: ocaml-nox camlp4 camlp4-extra ocaml ocaml-base-nox ocaml-base ocaml-native-compilers ocaml-source ocaml-interp ocaml-compiler-libs ocaml-mode
Architecture: source amd64 all
Version: 3.12.0-6
Distribution: unstable
Urgency: low
Maintainer: Debian OCaml Maintainers <debian-ocaml-maint@lists.debian.org>
Changed-By: Stéphane Glondu <glondu@debian.org>
Description:
camlp4 - Pre Processor Pretty Printer for OCaml
camlp4-extra - Pre Processor Pretty Printer for OCaml - extras
ocaml - ML language implementation with a class-based object system
ocaml-base - Runtime system for OCaml bytecode executables
ocaml-base-nox - Runtime system for OCaml bytecode executables (no X)
ocaml-compiler-libs - OCaml interpreter and standard libraries
ocaml-interp - OCaml interactive interpreter and standard libraries
ocaml-mode - major mode for editing Objective Caml in Emacs
ocaml-native-compilers - Native code compilers of the OCaml suite (the .opt ones)
ocaml-nox - ML implementation with a class-based object system (no X)
ocaml-source - Sources for Objective Caml
Closes: 627756 627761
Changes:
ocaml (3.12.0-6) unstable; urgency=low
.
* Provide a way to use legacy custom linking (Closes: #627761)
* Document Debian-specific -custom behaviour in README.Debian
* Properly initialize executable name in caml_startup_code
(Closes: #627756)
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