[Monotone-devel] illegal instruction again [was: Re: monotone 0.11 test failures]

[graydon hoare]

Derek Scherger wrote:

> I'm compiling against boost 1.31.0 as built by the gentoo ebuild so 
> although it was easy
> to build, I have *no* idea how it's configured.
>
> I've attached testsuite.log and can provide more info if you need it.

sorry, I thought I'd replied to this earlier. the problem you're having 
is the same "illegal instruction" fault that others have run into, when 
the SSE2 code is built but you're not on an SSE2 platform. athlon's 
don't like SSE2. it seems my runtime detection of SSE2 doesn't work 
quite right, so you wind up executing it even though your hardware can't.

the way around this with 0.11 is awkward but I believe doable:

1. edit configure.ac and comment out this line

  AC_CHECK_HEADERS(emmintrin.h, [CXXFLAGS="$CXXFLAGS -msse2"])

2. run "autoreconf"
3. run "./configure && make"

for reasons which aren't totally clear to me at the moment, configure 
with CXXFLAGS set to some explicit value on the command line fails in an 
unfortunate way. I'm obviously twiddling these flags wrong, so the above 
is the best fix I understand how to do at the moment.

-graydon