Re: [Qemu-devel] Build troubles...

[C.W. Betts]

On Friday 11 April 2008 03:09:25 am WaxDragon wrote:
> As of r4180, I'm getting this error building with gcc 3.4.6 on slackware:
>
> gcc -Wall -O2 -g -fno-strict-aliasing  -fno-reorder-blocks  -fno-gcse
>   -fno-optimize-sibling-calls  -fno-crossjumping  -fno-align-labels
> -fno-align-jumps  -fno-align-functions   -mpreferred-stack-boundary=2
> -fomit-frame-pointer  -m32 -I. -I.. -I/home/ford/src/qemu/target-i386
> -I/home/ford/src/qemu -MMD -MP -DNEED_CPU_H -D_GNU_SOURCE
> -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/home/ford/src/qemu/tcg
> -I/home/ford/src/qemu/tcg/i386 -I/home/ford/src/qemu/fpu -DHAS_AUDIO
> -DHAS_AUDIO_CHOICE -I/home/ford/src/qemu/slirp -c -o op.o
> /home/ford/src/qemu/target-i386/op.c
> /home/ford/src/qemu/target-i386/ops_sse.h: In function `op_pshufw_mmx':
> /home/ford/src/qemu/target-i386/ops_sse.h:597: error: unable to find a
> register to spill in class `GENERAL_REGS'
> /home/ford/src/qemu/target-i386/ops_sse.h:597: error: this is the insn:
> (insn:HI 18 17 19 0 /home/ford/src/qemu/target-i386/ops_sse.h:592 (set
> (strict_low_part (subreg:HI (reg/v:DI 58 [ r ]) 0))
>         (mem/s/j:HI (plus:SI (mult:SI (reg:SI 62)
>                     (const_int 2 [0x2]))
>                 (reg/v/f:SI 60 [ s ])) [0 <variable>._w S2 A16])) 43
> {*movstricthi_1} (insn_list 16 (insn_list 12 (insn_list 50 (nil))))
>     (expr_list:REG_DEAD (reg:SI 62)
>         (nil)))
> /home/ford/src/qemu/target-i386/ops_sse.h:597: confused by earlier
> errors, bailing out
> make[1]: *** [op.o] Error 1
> make[1]: Leaving directory `/home/ford/src/qemu/i386-softmmu'
> make: *** [subdir-i386-softmmu] Error 2
>
> any clues?

This is caused by the compiler optimizing for something higher than a pentium 
1 processor.  However, due to the current coding style of Qemu, it confuses 
the compiler and makes it fail.  To fix it, set the CFLAGS enviroment 
variable to include -march=pentium-mmx, like so:

CFLAGS=-march=pentium-mmx ./configure

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