[Qemu-devel] Error during compilation

[Qemu-devel] Error during compilation

[Peter Federighi]

Hello.

I recently downloaded Qemu to try it out.  My attempt to compile it ended
up producing the following error:

--- BEGIN OUTPUT ---

gcc -Wall -O2 -g -fno-strict-aliasing -fomit-frame-pointer -I.
-I/usr/src/qemu-0.6.1/target-i386 -I/usr/src/qemu-0.6.1 -D_GNU_SOURCE
-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/usr/src/qemu-0.6.1/slirp -c
-o helper.o /usr/src/qemu-0.6.1/target-i386/helper.c
/usr/src/qemu-0.6.1/softmmu_template.h: In function `__stq_mmu':
/usr/src/qemu-0.6.1/softmmu_template.h:223: error: unable to find a
register to spill in class `GENERAL_REGS'
/usr/src/qemu-0.6.1/softmmu_template.h:223: error: this is the insn:
(insn:HI 315 314 316 13 /usr/src/qemu-0.6.1/softmmu_template.h:252
(parallel [
            (set (reg:DI 0 ax [194])
                (lshiftrt:DI (reg/v:DI 59 [ val ])
                    (subreg:QI (reg:SI 0 ax [193]) 0)))
            (clobber (scratch:SI))
            (clobber (reg:CC 17 flags))
        ]) 306 {lshrdi3_1} (insn_list 314 (nil))
    (expr_list:REG_DEAD (reg:SI 0 ax [193])
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (expr_list:REG_UNUSED (scratch:SI)
                (nil)))))
/usr/src/qemu-0.6.1/softmmu_template.h:223: confused by earlier errors,
bailing out
make[1]: *** [helper.o] Error 1
make[1]: Leaving directory `/usr/src/qemu-0.6.1/i386'
make: *** [all] Error 1

--- END OUTPUT ---

Normally, I would include a solution to the error, but I have never seen
an error like this and don't really know what to do.  I get the same
problem when trying to compile the latest snapshot as well.  I hope that
this information is useful.

In case it matters, I have the following versions of software:
Linux		2.6.10
GCC		3.4.3
BinUtils	2.13.1
GLibc		2.3.2
GNU Make	3.80

Thank you for your time and effort on Qemu.

- Peter Federighi


The fear of the Lord is the beginning of wisdom,
and knowledge of the Holy One is understanding.
- Proverbs 9:10


		
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Re: [Qemu-devel] Error during compilation

[John R. Hogerhuis]

Huh... never seen gcc barf in lisp!

-- John.

Re: [Qemu-devel] Error during compilation

[Derek Fawcus]

On Tue, Mar 15, 2005 at 08:21:49AM -0800, John R. Hogerhuis wrote:
> Huh... never seen gcc barf in lisp!

RTL (back end CPU language) is basically a form of lisp.

DF

Re: [Qemu-devel] Error during compilation

[Thomas Schwinge]

On Tue, Mar 15, 2005 at 07:57:55AM -0800, Peter Federighi wrote:
> gcc -Wall -O2 -g -fno-strict-aliasing -fomit-frame-pointer -I.
> -I/usr/src/qemu-0.6.1/target-i386 -I/usr/src/qemu-0.6.1 -D_GNU_SOURCE
> -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/usr/src/qemu-0.6.1/slirp -c
> -o helper.o /usr/src/qemu-0.6.1/target-i386/helper.c
> /usr/src/qemu-0.6.1/softmmu_template.h: In function `__stq_mmu':
> /usr/src/qemu-0.6.1/softmmu_template.h:223: error: unable to find a
> register to spill in class `GENERAL_REGS'
> /usr/src/qemu-0.6.1/softmmu_template.h:223: error: this is the insn:
> (insn:HI 315 314 316 13 /usr/src/qemu-0.6.1/softmmu_template.h:252
> (parallel [
>             (set (reg:DI 0 ax [194])
>                 (lshiftrt:DI (reg/v:DI 59 [ val ])
>                     (subreg:QI (reg:SI 0 ax [193]) 0)))
>             (clobber (scratch:SI))
>             (clobber (reg:CC 17 flags))
>         ]) 306 {lshrdi3_1} (insn_list 314 (nil))
>     (expr_list:REG_DEAD (reg:SI 0 ax [193])
>         (expr_list:REG_UNUSED (reg:CC 17 flags)
>             (expr_list:REG_UNUSED (scratch:SI)
>                 (nil)))))
> /usr/src/qemu-0.6.1/softmmu_template.h:223: confused by earlier errors,
> bailing out
> make[1]: *** [helper.o] Error 1
> make[1]: Leaving directory `/usr/src/qemu-0.6.1/i386'
> make: *** [all] Error 1

I'm getting the same error when having '-march=athlon-xp' in my $CFLAGS
(and forcing qemu to use those).  Replacing that with '-march=pentium'
fixes the issue for me.

Perhaps someone (e.g. you :-) should report it on one of GCC's mailing
lists or through bugzilla (and reduce the code to only contain the
relevant parts before doing so).


Regards,
 Thomas

Re: [Qemu-devel] Error during compilation

[Struan Bartlett]

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Thomas Schwinge wrote:

>On Tue, Mar 15, 2005 at 07:57:55AM -0800, Peter Federighi wrote:
>  
>
>>gcc -Wall -O2 -g -fno-strict-aliasing -fomit-frame-pointer -I.
>>-I/usr/src/qemu-0.6.1/target-i386 -I/usr/src/qemu-0.6.1 -D_GNU_SOURCE
>>-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/usr/src/qemu-0.6.1/slirp -c
>>-o helper.o /usr/src/qemu-0.6.1/target-i386/helper.c
>>/usr/src/qemu-0.6.1/softmmu_template.h: In function `__stq_mmu':
>>/usr/src/qemu-0.6.1/softmmu_template.h:223: error: unable to find a
>>register to spill in class `GENERAL_REGS'
>>/usr/src/qemu-0.6.1/softmmu_template.h:223: error: this is the insn:
>>(insn:HI 315 314 316 13 /usr/src/qemu-0.6.1/softmmu_template.h:252
>>(parallel [
>>            (set (reg:DI 0 ax [194])
>>                (lshiftrt:DI (reg/v:DI 59 [ val ])
>>                    (subreg:QI (reg:SI 0 ax [193]) 0)))
>>            (clobber (scratch:SI))
>>            (clobber (reg:CC 17 flags))
>>        ]) 306 {lshrdi3_1} (insn_list 314 (nil))
>>    (expr_list:REG_DEAD (reg:SI 0 ax [193])
>>        (expr_list:REG_UNUSED (reg:CC 17 flags)
>>            (expr_list:REG_UNUSED (scratch:SI)
>>                (nil)))))
>>/usr/src/qemu-0.6.1/softmmu_template.h:223: confused by earlier errors,
>>bailing out
>>make[1]: *** [helper.o] Error 1
>>make[1]: Leaving directory `/usr/src/qemu-0.6.1/i386'
>>make: *** [all] Error 1
>>    
>>
>
>I'm getting the same error when having '-march=athlon-xp' in my $CFLAGS
>(and forcing qemu to use those).  Replacing that with '-march=pentium'
>fixes the issue for me.
>
I got the same error compiling QEMU with -march=pentium3, but only on 
op.c and helper.c. All other files compiled fine with that option. Those 
two files compiled fine with -march=pentium.

Is it a bug? I idly speculated that the register selection method might 
be different for different archs and that, because these files might 
demand certain registers be used for certain purposes, the compiler 
might simple be "unable to find a register" for its needs.

Struan


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