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Date: Thu, 22 Mar 2007 20:46:29 +0100
From: Thomas Orgis <thomas-forum@orgis.org>
Subject: Re: [Qemu-devel] 0.9.0 and svn don't build with -march=pentium2
	etc.; was: Latest SVN fails to build on Fedora Core 6 (same with 0.9.0)
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To: qemu-devel@nongnu.org

Am Sun, 18 Mar 2007 09:18:40 +0000
schrieb Nigel Horne <njh@bandsman.co.uk>: 

> The first part is true, the second is not, in that I already upgraded
> to the 686 kernel, so the qemu build on FC6 is not fixed by installing the 686 kernel.

So, do we have any other clue about this?
Some qemu coder knows anything about this error?

> /opt/gcc34/bin/gcc -march=pentium2 -Wall -O2 -g -fno-strict-aliasing
> -fomit-frame-pointer -I. -I.. -I/usr/src/qemu-0.9.0/target-i386
> -I/usr/src/qemu-0.9.0 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
> -D_LARGEFILE_SOURCE -I/usr/src/qemu-0.9.0/fpu -DHAS_AUDIO
> -I/usr/src/qemu-0.9.0/slirp  -c -o
> helper.o /usr/src/qemu-0.9.0/target-i386/helper.c ../softmmu_template.h:
> In function `__stq_mmu': ../softmmu_template.h:260: error: unable to
> find a register to spill in class
> `GENERAL_REGS' ../softmmu_template.h:260: error: this is the insn:
> (insn:HI 365 364 366 13 ../softmmu_template.h:290 (parallel [ (set
> (reg:DI 0 ax [216]) (lshiftrt:DI (reg/v:DI 59 [ val ]) (subreg:QI
> (reg:SI 0 ax [215]) 0))) (clobber (scratch:SI)) (clobber (reg:CC 17
> flags)) ]) 309 {lshrdi3_1} (insn_list 364 (nil)) (expr_list:REG_DEAD
> (reg:SI 0 ax [215]) (expr_list:REG_UNUSED (reg:CC 17 flags)
> (expr_list:REG_UNUSED (scratch:SI) (nil)))))
> ../softmmu_template.h:260: confused by earlier errors, bailing out

It is really persistent with any pentium/athlon march setting above
pentium-mmx and alone with the -msse flag.
If the answer is "Do Not Use GCC Arch Setting" then it would be nice to
have it spelled out by someone else than me... of course I'd prefer
this thing to work;-)


Thomas.