From owner-freebsd-current  Wed Dec 29 11:37:51 1999
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To: "Jordan K. Hubbard" <jkh@zippy.cdrom.com>
Cc: Peter Wemm <peter@netplex.com.au>,
	Bill Fumerola <billf@chc-chimes.com>, obrien@FreeBSD.org,
	Donn Miller <dmmiller@cvzoom.net>, current@FreeBSD.org
Subject: Re: gcc compile error 
In-reply-to: Your message of "Wed, 29 Dec 1999 10:43:32 PST."
             <28389.946493012@zippy.cdrom.com> 
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Date: Wed, 29 Dec 1999 11:37:18 -0800
From: Amancio Hasty <hasty@rah.star-gate.com>
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> Sending out an attachment of that size to a public mailing list was
> hardly necessary, and the increasing stridency of your posts leading
> up to this only serve to indicate that you may be heading in the truly
> wrong direction with all this and seriously need to rethink your
> strategy before you do something that has people howling for your
> blood.
> 
> - Jordan


Okay folks, 

This is the scoop. 

For the benefit of those which don't have access to the latest XFree86 release you can
download the file from ftp://rah.star-gate.com/pub/bug.c

uname -a
FreeBSD x.star-gate.com 4.0-CURRENT FreeBSD 4.0-CURRENT #2: Mon Dec 27 13:55:25 PST 1999     root@x.star-gate.com:/usr/src/sys/compile/MUADIB  i386

gcc -v
Using builtin specs.
gcc version 2.95.2 19991024 (release)

 gcc -c -O2  bug.c
xf86vmode.c: In function `ProcXF86VidModeGetMonitor':
xf86vmode.c:1320: Unable to generate reloads for:
(insn 300 298 302 (parallel[ 
            (set (reg:SI 0 %eax)
                (fix:SI (fix:SF (subreg:SF (reg:SI 0 %eax) 0))))
            (clobber (mem:HI (plus:SI (reg:SI 6 %ebp)
                        (const_int -34 [0xffffffde])) 0))
            (clobber (mem:HI (plus:SI (reg:SI 6 %ebp)
                        (const_int -36 [0xffffffdc])) 0))
            (clobber (mem:SI (plus:SI (reg:SI 6 %ebp)
                        (const_int -40 [0xffffffd8])) 0))
            (clobber (scratch:HI))
        ] ) 145 {fix_truncsfsi2+1} (insn_list 293 (nil))
    (expr_list:REG_DEAD (reg:SI 0 %eax)
        (expr_list:REG_UNUSED (scratch:HI)
            (nil))))

------------------------------

Without -O or -O2 the program compiles okay.

gcc -c bug.c


According to Peter, the ports/lang/gcc-devel (the current snapshot)  appears to 
compile this program fine -- that is the compiler bug has been fixed.

So there appears to be two solutions to get around this problem:

1. compile without -O 
or 
2.  installed the latest snapshot of gcc.

	Take Care Guys

-- 

 Amancio Hasty
 hasty@rah.star-gate.com




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