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

Álvaro Castro-Castilla alvaro.castro.castilla at gmail.com
Wed Feb 15 18:30:13 EST 2012


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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