Subject: Re: proposal for selecting hw/dependent libraries
To: Christos Zoulas <>
From: Jason Thorpe <>
List: tech-toolchain
Date: 12/12/1999 14:06:31
On Sun, 12 Dec 1999 16:42:15 -0500 (Christos Zoulas) wrote:

 > Here's a brief update on what I am planning to implement for
 > in order to solve the problem of selecting different libraries at runtime
 > depending on the capabilities of the hardware.
 > In /etc/, add lines of the form
 > <library-name>	<sysctl-machdep-name>	<value>:<library-name> ...
 > For example could contain:
 >     m	fpu_present	0:msoft	1:m387
 > etc.

Great!  This is cool!

How does it handle defaults, tho?  I suppose we have library build
infrastructure to take care of this?

Also, what about just portions of libraries?  e.g. BWX-optimized string
routines on Alpha?

Also, do the return values have to be ints, or can they be strings?

I'm thinking of the Alpha case again, here.  We can't just key off
"21164" ... BWX appears in "21164A" (EV56), "21164PC" (PCA56), and
"21264" (EV6).

        -- Jason R. Thorpe <>