[Python-Dev] troubling math bug under IRIX 6.5

[Flying Cougar Burnette]

Tim Peters writes:
| [Flying Cougar Burnette]
| > ...
| > >>> 4 * math.exp(-0.5)
| > Bus error (core dumped)
| 
| Now let's look at the important <wink> part:
| 
| > (tommy@mace)/u0/tommy/pycvs/python/dist/src$ ./python
| > Python 2.1a2 (#2, Feb 13 2001, 09:49:17) [C] on irix6
|                                                   ^^^^^

figgered as much...

| 
| The first thing to try on any SGI box is to recompile Python with
| optimization turned off.  After that confirms it's the compiler's fault, we
| can try to figure out where it's screwing up.  Do either of these blow up
| too?
| 
| >>> 4 * 0.60653065971263342
| >>> 4.0 * math.exp(-0.5)

yup.

| 
| > is it just me?
| 
| Yup.  So long as you use SGI software, it always will be <wink>.
| 
| and-i-say-that-as-an-sgi-shareholder-ly y'rs  - tim

one these days sgi... Pow! Right to the Moon! ;)

Okay, I recompiled after blanking OPT= in Makefile and things now
work.  This is where I start swearing "But, this has never happened to
me before!"  and the kind, gentle response is "Don't worry, it happens
to lots of guys..." ;)

And the next step is... ?