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[bug #43381] Sourcing GNUstep.sh can cause problems with LD_LIBRARY_PATH
From: |
Alastair Pharo |
Subject: |
[bug #43381] Sourcing GNUstep.sh can cause problems with LD_LIBRARY_PATH |
Date: |
Wed, 08 Oct 2014 13:18:09 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:32.0) Gecko/20100101 Firefox/32.0 |
URL:
<http://savannah.gnu.org/bugs/?43381>
Summary: Sourcing GNUstep.sh can cause problems with
LD_LIBRARY_PATH
Project: GNUstep
Submitted by: asppsa
Submitted on: Wed 08 Oct 2014 01:18:08 PM GMT
Category: Makefiles
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
Hi there,
I have encountered a problem with GNUstep on Arch Linux, although I think the
issue would affect other Linux systems too.
On Arch, GNUSTEP_SYSTEM_LIBRARIES is set to /usr/lib. As you will know,
sourcing GNUstep.sh creates or adds to the LD_LIBRARY_PATH environment
variable so that it includes the various locations that GNUstep uses. This
will include /usr/lib if that is what GNUSTEP_SYSTEM_LIBRARIES is set to.
As I understand it, the problem is then that when dynamically linking an ELF
binary, ld.so will look in directories listed in LD_LIBRARY_PATH before it
looks in the directories specified by the binary's DT_RUNPATH section.
Therefore, if for instance a binary depends on a non-standard version of libc,
the location of which is specified via its DT_RUNPATH section, this will be
clobbered by GNUstep's LD_LIBRARY_PATH setting and the wrong libc will be
linked when attempting to run. The Nix package manager (nixos.org) apparently
uses DT_RUNPATH extensively to handle dependencies, and sourcing GNUstep.sh
(on Arch at least) currently causes Nix to stop working.
I think the solution to this would be to add extra filtering to GNUstep.sh to
prevent it from adding paths that will be included by default anyway (at least
/lib and /usr/lib) to LD_LIBRARY_PATH.
If you think this something for Arch Linux to sort out with their package, I
am happy to take it up with them instead.
Cheers,
Alastair
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