Bill Hart wrote:
On 22 Feb, 11:27, "Dr. David Kirkby" <david.kir...@onetel.net> wrote:
This came up on the thread "mercurial on t2" but I thought I'd start a new
thread on it.
I'd propose that we include in any binary distribution gcc's C, C++ and Fortran
shared libraries. They would be placed in $SAGE_LOCAL/lib. Then we can ensure
that people will run Sage with what libraries Sage was built with, rather than
what versions they may or may not have lying around.
Comments?
Dave
> Are we sure this would work? Won't those libraries depend on what
> kernel is installed, etc, etc?
>
> I'm completely ignorant on this, so may be talk out my proverbial.
>
> Bill.
>
I would not have thought so, though I don't claim to be an expert on this.
I just checked the sage-4.3.2-linux-64bit-ubuntu_9.10-x86_64-Linux binary, and
find the fortran library libgfortran.so is already there, as otherwise one would
need to have gfortran installed to run Sage. Since that is not causing any
particular kernel issues, I doubt the C or C++ libraries would either. (As
always, there can always be unwelcome surprises.)
The file COPYING.LIB in the gcc source distribution specifically allows copying
the libraries for the purposes of running code on other systems, without
including the source code for your proprietary program. I don't think the gcc
developers would bother if the version of the library depended on the kernel
version in use on the other system.
Of course, we already have to produce different binaries for different Linux
distributions. So I'd suggest just copying the gcc libraries from whatever
system one built Sage on.
The libraries I put in the Solaris binary were copied from a Sun running the
very first Solaris 10 release (03/2005). The kernel on both t2 and my other
Solaris box are both late 2009. So even with 4.5 years of kernel updates, the
gcc libraries still work. (I know Linux tends to have poorer backward
compatibility than Solaris, but I doubt that would be an issue even on Linux).
Dave
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