On Sun, Aug 28, 2011 at 2:10 PM, leif <[email protected]> wrote: > On 28 Aug., 19:44, Martin Albrecht <[email protected]> > wrote: >> > If 'configure' determined the machine supports SSE2, __M4RI_HAVE_SSE2 >> > is set to 1, but even if that's the case, you should still also test >> > __SSE2__ when compiling code later (including code *using* the >> > library). >> >> Why? I want that whoever links against M4RI lives in the same world as M4RI. > > I'd add something like > > #if defined(__M4RI_HAVE_SSE2) && __M4RI_HAVE_SSE2 > # if !defined(__SSE2__) || !__SSE2__ > # error Your current compiler and / or CFLAGS setting doesn't > allow SSE2 code. Please change that or these to the setting(s) you > used when compiling M4RI. > # endif > #endif > > since $CC and $CFLAGS, and hence also the necessity to add some > compiler flags (as determined at *configure* or build time of the M4RI > library *itself*) aren't invariants, at least not over the typical > lifetime of a Sage installation. > > Any (manual or automatically triggered) './sage -b' might recompile > also modules *using* libm4ri, with settings potentially different to > those at the time M4RI was built, and $SAGE_LOCAL/include/m4ri/ > m4ri_config.h created (which defines __M4RI_HAVE_SSE2) . > > > For more, the interested reader is referred to > > http://trac.sagemath.org/sage_trac/ticket/11574#comment:49 ff. > > ;-) > >> In the spirit of William's "post more" encouragement shouldn't we keep >> this on list? :) > > (Sorry, William, but I think the number of postings has already grown > again recently.)
You're right -- August numbers for sage-devel are already up nearly 50% over July. Still, lots of public discussion is good, imho. William > > > -leif > > -- > To post to this group, send an email to [email protected] > To unsubscribe from this group, send an email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org > -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send an email to [email protected] To unsubscribe from this group, send an email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
