Re: gcc & M68881 fp processor

Thread View: gnu.utils.bug

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1 total messages Started by ganymede!tmb Tue, 25 Oct 1988 00:22

#1386

Author: ganymede!tmb
Date: Tue, 25 Oct 1988 00:22

31 lines
1463 bytes

	gcc has a bug in that it compiles assuming that a M68881 floating
	point coprocessor is available, when I compile it on cream-of-wheat.
	I cannot run it on kaboom (a 3/50).  Additionally, I cannot run gcc
	itself on a 3/50 because it's compiled assuming a M68881 fp
	coprocessor!
	
	The default should be the equivalent of the Sun cc -fsoft switch.
	
	or a switch sould be provided to get -fsoft behavior and a manual
	page should be made available to document it.

No bug. This is quite well documented in "Internals of GNU CC" (which
is the one and only user's manual):

   These are the '-m' options defined in the 68000 machine description:
   
   ...
   
   '-m68881'	Generate output containing 68881 instructions for floating
   		point. This is the default if you use the unmodified sources.
   
   '-msoft-float'	Generate output containing library calls for floating point.
   
   ...
   
   
The manual page doesn't list most of the switches.

If there is a bug, it's with the Sun kernel. It should provide co-processor
emulation.

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