GNU bug report logs - #26048
Use absolute file names in NEED instead of adding many entries to RUNPATH

Previous Next

Full log

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: bug-guix <at> gnu.org
Subject: Use absolute file names in NEED instead of adding many entries to
 RUNPATH
Date: Fri, 10 Mar 2017 16:01:04 +0100

Hello!

As Andy just noted on IRC, shared library lookup is inefficient in Guix,
because there’s one entry per library in RUNPATH.  So we get:

--8<---------------cut here---------------start------------->8---
open("/gnu/store/y8ppqsxiki39n4mqpb4mab6bgwqsnnp7-libgc-7.4.2/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/gnu/store/w0bkj9qh7iqcklm5ld8ghg1ynnzqyv00-libffi-3.2.1/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/gnu/store/d5gw4i6bnyznmbr55ba39bl3pgrhsyp0-libunistring-0.9.6/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/gnu/store/6k08nkddnrb15h5pwp1s0fa94mr1qas9-gmp-6.1.1/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/gnu/store/9yn89bkl8vcg5rh9dmw3jijciwgrwjls-libltdl-2.4.6/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/gnu/store/iwgi9001dmmihrjg4rqhd6pa6788prjw-glibc-2.24/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
--8<---------------cut here---------------end--------------->8---

An alternate approach would be for ld-wrapper to replace “-lfoo” with
“/gnu/store/…/libfoo.so”, which would add the absolute file name as
NEEDed in the ELF file.

Ludo’.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.