#9871: Change compiler flags on Solaris to build without text relocations.
----------------------------+-----------------------------------------------
Reporter: drkirkby | Owner: GeorgSWeber
Type: defect | Status: needs_work
Priority: critical | Milestone: sage-4.6
Component: build | Keywords:
Author: David Kirkby | Upstream: None of the above - read trac for
reasoning.
Reviewer: | Merged:
Work_issues: |
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Comment(by drkirkby):
It looks like we need {{{-z text}}} to be passed to the linker. From the
linker man page:
{{{
-z text
In dynamic mode only, forces a fatal error if any relo-
cations against non-writable, allocatable sections
remain. For historic reasons, this mode is not the
default when building an executable or shared object.
However, its use is recommended to insure that the text
segment of the dynamic object being built is shareable
between multiple running processes. A shared text seg-
ment incurs the least relocation overhead when loaded
into memory.
}}}
Adding that to the linker flags avoids the issue:
{{{
(sage subshell) t2:src kirkby$ make
gcc -m64 -DENABLE_LONG_OPTIONS -o cl.o -c cl.c
gcc -m64 -c -o cliquer.o cliquer.c
gcc -m64 -c -o graph.o graph.c
gcc -m64 -c -o reorder.o reorder.c
gcc -m64 -Wl,-ztext -o libcliquer.so cl.o cliquer.o graph.o reorder.o
SAGE_ROOT=/rootpool2/local/kirkby/t2/64/sage-4.5.3.alpha2
(sage subshell) t2:src kirkby$ elfdump -d libcliquer.so | grep TEXTRE
SAGE_ROOT=/rootpool2/local/kirkby/t2/64/sage-4.5.3.alpha2
}}}
However, I have '''not''' checked if this produces a usable shared library
or not. (Note, it is OK to use {{{-ztext}}} rather than {{{-z text}}}. It
stops one having to put quotes around things and is perfectly acceptable
to the Sun linker and in fact Sun tools in general.
This '''could''' be the magic option needed to sort out R and ECL, both of
which suffer this problem.
Dave
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9871#comment:22>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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