[gambit-list] gambit 4.6.4 taking long time to compile blackhole

Bradley Lucier lucier at math.purdue.edu
Wed Feb 15 20:13:54 EST 2012


I've suggested something with a bit more detail here:

http://www.iro.umontreal.ca/~gambit/bugzilla/show_bug.cgi?id=136

but I don't know how to do it myself.

Brad

On Feb 15, 2012, at 6:30 PM, Álvaro Castro-Castilla wrote:

> What about a configure option for overriding the optimization level, keeping O2 as default (maybe there is one already? but I just commented out some lines in the configure.ac)
> gcc-4.5.3 is the current stable in Gentoo, I'll check tomorrow in Ubuntu.
> 
> 
> 
> 
> 2012/2/16 Marc Feeley <feeley at iro.umontreal.ca>
> 
> On 2012-02-15, at 6:06 PM, Álvaro Castro-Castilla wrote:
> 
> > Maybe just activating O2 if gcc >= 4.7 (if the patch Alex was telling about works);
> 
> That's too brittle.  I know that -O2 was *not* OK with the gcc that was current a few years ago, and -O2 is OK with gcc 4.2.1, yet -O2 is *not* OK with gcc 4.5.3, yet it is OK with gcc 4.7.  There's really no evidence that gcc's algorithms will not get worse after gcc 4.7 (and in fact the past history of the evolution of gcc points to chaotic changes in the algorithmic complexity).
> 
> > then O3 if more than 8gb ram available and gcc >= 4.7.
> 
> I don't know how to test for this portably.
> 
> Marc
> 
> 
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