[Qemu-devel] build failure on x86, any suggestions?

[Qemu-devel] build failure on x86, any suggestions?

[Peter Volkov]

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Hello.

I just wanted to point developers attention to the following bug:
bugs.gentoo.org/212351 , comment #11 and further. The problem is that
qemu does not compile any more on x86. I've tried recent snapshot
(2008-03-15_05) and the problem persist there.

The problem gentoo is that previous versions are known to be affected to
security vulnerability so we'll have to mask it soon, while version
which does not build successfully will be masked too as there is no
reason to keep broken package in stable. Could anybody of developers
suggest anything on this issue? Thank you very much in advance!


The actual build error:

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/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386
-I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05 -MMD -MP -DNEED_CPU_H
-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/tcg
-I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/tcg/i386
-I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/fpu
-I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/linux-user
-I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/linux-user/i386 -c -o
op.o /home/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386/op.c
/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386/ops_sse.h:
In function `op_psrlq_mmx':
/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386/ops_sse.h:213: error: unable to find a register to spill in class `GENERAL_REGS'
/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386/ops_sse.h:213: error: this is the insn:
(insn:HI 36 35 37
3 /home/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386/ops_sse.h:207 (parallel [
            (set (reg:DI 63 [ <variable>.q ])
                (lshiftrt:DI (reg:DI 63 [ <variable>.q ])
                    (subreg:QI (reg/v:SI 60 [ shift ]) 0)))
            (clobber (scratch:SI))
            (clobber (reg:CC 17 flags))
        ]) 309 {lshrdi3_1} (insn_list 33 (insn_list 35 (nil)))
    (expr_list:REG_DEAD (reg/v:SI 60 [ shift ])
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (expr_list:REG_UNUSED (scratch:SI)
                (nil)))))

-- 
Peter.

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Re: [Qemu-devel] build failure on x86, any suggestions?

[Paul Brook]

On Saturday 15 March 2008, Peter Volkov wrote:
> Hello.
>
> I just wanted to point developers attention to the following bug:
> bugs.gentoo.org/212351 , comment #11 and further. The problem is that
> qemu does not compile any more on x86. I've tried recent snapshot
> (2008-03-15_05) and the problem persist there.

You're almost certainly using gcc4.x. Don't do that.

IIRC gentoo already has a big pile hacks for this. This kind of breakage is 
exactly why those hacks haven't been merged into cvs. They're papering over 
the problem rather than fixing it, so you should expect them to need constant 
maintenance.

As mentioned several times on this recently on this list, the proper fix is to 
finish the TCG conversion. That will happen "when it's done".

Paul

Re: [Qemu-devel] build failure on x86, any suggestions?

[Peter Volkov]

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В Сбт, 15/03/2008 в 14:20 +0000, Paul Brook пишет:
> On Saturday 15 March 2008, Peter Volkov wrote:
> > Hello.
> >
> > I just wanted to point developers attention to the following bug:
> > bugs.gentoo.org/212351 , comment #11 and further. The problem is that
> > qemu does not compile any more on x86. I've tried recent snapshot
> > (2008-03-15_05) and the problem persist there.
> 
> You're almost certainly using gcc4.x. Don't do that.

Paul, thank you for you answer. I do have gcc-4 installed on my system
but I'm sure that I'm using gcc-3.4:

> gcc --version
gcc (GCC) 3.4.6 (Gentoo 3.4.6-r2 p1.5, ssp-3.4.6-1.0, pie-8.7.10)

As I read FAQ this version should be supported. I've tried to build gcc
without patches (ssp, pie, C++ support and some gentoo specific patches)
but qemu build process still fails at the same place...

> IIRC gentoo already has a big pile hacks for this. This kind of breakage is 
> exactly why those hacks haven't been merged into cvs. They're papering over 
> the problem rather than fixing it, so you should expect them to need constant 
> maintenance.

Sorry, but what hacks are you talking about? The only hack I'm aware
about is that all system is build with newer compiler while to build
qemu I have to install old gcc.

> As mentioned several times on this recently on this list, the proper fix is to 
> finish the TCG conversion. That will happen "when it's done".

Eh, I saw you talking about this and I'm aware that this will definitely
take time. That's why I asked for suggestion...

-- 
Peter.

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Re: [Qemu-devel] build failure on x86, any suggestions?

[Alexander Graf]

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Peter Volkov wrote:
> В Сбт, 15/03/2008 в 14:20 +0000, Paul Brook пишет:
>   
>> On Saturday 15 March 2008, Peter Volkov wrote:
>>     
>>> Hello.
>>>
>>> I just wanted to point developers attention to the following bug:
>>> bugs.gentoo.org/212351 , comment #11 and further. The problem is that
>>> qemu does not compile any more on x86. I've tried recent snapshot
>>> (2008-03-15_05) and the problem persist there.
>>>       
>> You're almost certainly using gcc4.x. Don't do that.
>>     
>
> Paul, thank you for you answer. I do have gcc-4 installed on my system
> but I'm sure that I'm using gcc-3.4:
>
>   
>> gcc --version
>>     
> gcc (GCC) 3.4.6 (Gentoo 3.4.6-r2 p1.5, ssp-3.4.6-1.0, pie-8.7.10)
>
> As I read FAQ this version should be supported. I've tried to build gcc
> without patches (ssp, pie, C++ support and some gentoo specific patches)
> but qemu build process still fails at the same place...
>
>   
>> IIRC gentoo already has a big pile hacks for this. This kind of breakage is 
>> exactly why those hacks haven't been merged into cvs. They're papering over 
>> the problem rather than fixing it, so you should expect them to need constant 
>> maintenance.
>>     
>
> Sorry, but what hacks are you talking about? The only hack I'm aware
> about is that all system is build with newer compiler while to build
> qemu I have to install old gcc.
>
>   
>> As mentioned several times on this recently on this list, the proper fix is to 
>> finish the TCG conversion. That will happen "when it's done".
>>     
>
> Eh, I saw you talking about this and I'm aware that this will definitely
> take time. That's why I asked for suggestion...
>
>   


For the time being you could try the appended patch. It makes x86 on x86
slower though, but should enable you to have a working build at all. I
am not 100% sure if it actually does help in your case though.

Alex



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--- a/target-i386/op.c
+++ b/target-i386/op.c
@@ -18,7 +18,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#define ASM_SOFTMMU
+//#define ASM_SOFTMMU
 #include "exec.h"
 
 /* n must be a constant to be efficient */

Re: [Qemu-devel] build failure on x86, any suggestions?

[C.W. Betts]

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On Saturday 15 March 2008 09:13:02 am Peter Volkov wrote:
> В Сбт, 15/03/2008 в 14:20 +0000, Paul Brook пишет:
> > On Saturday 15 March 2008, Peter Volkov wrote:
> > > Hello.
> > >
> > > I just wanted to point developers attention to the following bug:
> > > bugs.gentoo.org/212351 , comment #11 and further. The problem is that
> > > qemu does not compile any more on x86. I've tried recent snapshot
> > > (2008-03-15_05) and the problem persist there.
> >
> > You're almost certainly using gcc4.x. Don't do that.
>
> Paul, thank you for you answer. I do have gcc-4 installed on my system
>
> but I'm sure that I'm using gcc-3.4:
> > gcc --version

Try setting the compiler flags to use -march=pentium-mmx . That is the max 
setting for -march that qemu compiles on.  also, make sure that the compiler 
isn't sending any of the -msse functions.

I tried to build qemu using -msse -march=pentium3 and it spat out the same 
thing.

> gcc (GCC) 3.4.6 (Gentoo 3.4.6-r2 p1.5, ssp-3.4.6-1.0, pie-8.7.10)
>
> As I read FAQ this version should be supported. I've tried to build gcc
> without patches (ssp, pie, C++ support and some gentoo specific patches)
> but qemu build process still fails at the same place...
>
> > IIRC gentoo already has a big pile hacks for this. This kind of
> > breakage is exactly why those hacks haven't been merged into cvs.
> > They're papering over the problem rather than fixing it, so you should
> > expect them to need constant maintenance.
>
> Sorry, but what hacks are you talking about? The only hack I'm aware
> about is that all system is build with newer compiler while to build
> qemu I have to install old gcc.
>
> > As mentioned several times on this recently on this list, the proper
> > fix is to finish the TCG conversion. That will happen "when it's done".
>
> Eh, I saw you talking about this and I'm aware that this will definitely
> take time. That's why I asked for suggestion...

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Re: [Qemu-devel] build failure on x86, any suggestions?

[Peter Volkov]

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В Вск, 16/03/2008 в 00:01 -0600, C.W. Betts пишет:
> Try setting the compiler flags to use -march=pentium-mmx . That is the max 
> setting for -march that qemu compiles on.  also, make sure that the compiler 
> isn't sending any of the -msse functions.
> 
> I tried to build qemu using -msse -march=pentium3 and it spat out the same 
> thing.

Well with -march=pentium-mmx it works, although it occurs that
$ export CFLAGS="-march=pentium-mmx"
is not enough. I have to path CFLAGS to make with
$ emake OS_CFLAGS="${CFLAGS}"
CFLAGS are prefixed at the beginning of the compilation command ands
seems that -g -O2 which will go later redefine something which in turn
cause the build to fail and OS_CFLAGS passes -march after -g -O2.

Also strange thing is that if I try to disable all sse thing in compiler
appending -mno-sse{,2,3} -mfpmath=387 qemu does not builds. Either I
miss something or sse is not the only problem.

Two patches suggested here by Alexander and Blue did no difference here.

But in any case we have at least one working solution here and it's
better than nothing. Your suggestions here were very helpful! Thank you
all!

-- 
Peter.

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Re: [Qemu-devel] build failure on x86, any suggestions?

[Blue Swirl]

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On 3/16/08, Peter Volkov <pva@gentoo.org> wrote:
> В Вск, 16/03/2008 в 00:01 -0600, C.W. Betts пишет:
>
> > Try setting the compiler flags to use -march=pentium-mmx . That is the max
>  > setting for -march that qemu compiles on.  also, make sure that the compiler
>  > isn't sending any of the -msse functions.
>  >
>  > I tried to build qemu using -msse -march=pentium3 and it spat out the same
>  > thing.
>
>
> Well with -march=pentium-mmx it works, although it occurs that
>  $ export CFLAGS="-march=pentium-mmx"
>  is not enough. I have to path CFLAGS to make with
>  $ emake OS_CFLAGS="${CFLAGS}"
>  CFLAGS are prefixed at the beginning of the compilation command ands
>  seems that -g -O2 which will go later redefine something which in turn
>  cause the build to fail and OS_CFLAGS passes -march after -g -O2.
>
>  Also strange thing is that if I try to disable all sse thing in compiler
>  appending -mno-sse{,2,3} -mfpmath=387 qemu does not builds. Either I
>  miss something or sse is not the only problem.
>
>  Two patches suggested here by Alexander and Blue did no difference here.

Please try this patch and if it fails, report also the compiler error message.

I'm trying to find the range of instructions that need to be converted
to TCG helpers.

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Re: [Qemu-devel] build failure on x86, any suggestions?

[C.W. Betts]

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On Sunday 16 March 2008 10:20:30 am Blue Swirl wrote:
> On 3/16/08, Peter Volkov <pva@gentoo.org> wrote:
> > В Вск, 16/03/2008 в 00:01 -0600, C.W. Betts пишет:
> > > Try setting the compiler flags to use -march=pentium-mmx . That is the
> > > max
> > >
> >  > setting for -march that qemu compiles on.  also, make sure that the
> >  > compiler isn't sending any of the -msse functions.
> >  >
> >  > I tried to build qemu using -msse -march=pentium3 and it spat out the
> >  > same thing.
> >
> > Well with -march=pentium-mmx it works, although it occurs that
> >  $ export CFLAGS="-march=pentium-mmx"
> >  is not enough. I have to path CFLAGS to make with
> >  $ emake OS_CFLAGS="${CFLAGS}"
> >  CFLAGS are prefixed at the beginning of the compilation command ands
> >  seems that -g -O2 which will go later redefine something which in turn
> >  cause the build to fail and OS_CFLAGS passes -march after -g -O2.
> >
> >  Also strange thing is that if I try to disable all sse thing in compiler
> >  appending -mno-sse{,2,3} -mfpmath=387 qemu does not builds. Either I
> >  miss something or sse is not the only problem.
> >
> >  Two patches suggested here by Alexander and Blue did no difference here.
>
> Please try this patch and if it fails, report also the compiler error
> message.
>
> I'm trying to find the range of instructions that need to be converted
> to TCG helpers.

Okay, the patch makes op.c and translate.c compile.  I did have a problem with trying to get the makefile to compile op.c with the additional flags, but I worked around it.  
However, now the helper.c file spits out:
gcc-3.4  -fomit-frame-pointer -I. -I.. -I/home/test/makestuff/qemu-patched/target-i386 -I/home/test/makestuff/qemu-patched -MMD -MP -DNEED_CPU_H -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/home/test/makestuff/qemu-patched/tcg -I/home/test/makestuff/qemu-patched/tcg/i386 -I/home/test/makestuff/qemu-patched/fpu  -DHAS_AUDIO -DHAS_AUDIO_CHOICE -I/home/test/makestuff/qemu-patched/slirp -mfpmath=sse -march=pentium3 -msse -Wall -O2 -g -fno-strict-aliasing -mfpmath=sse -march=pentium3 -msse -m32 -c -o helper.o /home/test/makestuff/qemu-patched/target-i386/helper.c
/home/test/makestuff/qemu-patched/target-i386/helper.c: In function `svm_check_intercept_param':
/home/test/makestuff/qemu-patched/target-i386/helper.c:4375: error: unable to find a register to spill in class `GENERAL_REGS'
/home/test/makestuff/qemu-patched/target-i386/helper.c:4375: error: this is the insn:
(insn:HI 353 352 354 39 /home/test/makestuff/qemu-patched/target-i386/helper.c:4368 (parallel [
            (set (reg:DI 167 [ <variable>.intercept ])
                (lshiftrt:DI (reg:DI 167 [ <variable>.intercept ])
                    (subreg:QI (reg:SI 166) 0)))
            (clobber (scratch:SI))
            (clobber (reg:CC 17 flags))
        ]) 309 {lshrdi3_1} (insn_list 351 (insn_list 352 (nil)))
    (expr_list:REG_DEAD (reg:SI 166)
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (expr_list:REG_UNUSED (scratch:SI)
                (nil)))))
/home/test/makestuff/qemu-patched/target-i386/helper.c:4375: confused by earlier errors, bailing out
make: *** [helper.o] Error 1
This is only on the i386 target.  When I compile the x86_64 target, it works just fine.

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Re: [Qemu-devel] build failure on x86, any suggestions?

[Stefan Weil]

Paul Brook schrieb:
> On Saturday 15 March 2008, Peter Volkov wrote:
>> Hello.
>>
>> I just wanted to point developers attention to the following bug:
>> bugs.gentoo.org/212351 , comment #11 and further. The problem is that
>> qemu does not compile any more on x86. I've tried recent snapshot
>> (2008-03-15_05) and the problem persist there.
>
> You're almost certainly using gcc4.x. Don't do that.
>
> IIRC gentoo already has a big pile hacks for this. This kind of 
> breakage is
> exactly why those hacks haven't been merged into cvs. They're papering 
> over
> the problem rather than fixing it, so you should expect them to need 
> constant
> maintenance.
>
> As mentioned several times on this recently on this list, the proper 
> fix is to
> finish the TCG conversion. That will happen "when it's done".
>
> Paul
Hi Paul,

I got two similar error messages from other users. Both were using gcc-3.4,
one of them from ubuntu 7.10 (32bit). My own system had no problems
compiling exactly the same version with Debian lenny (amd64) gcc-3.4.

Stefan

Re: [Qemu-devel] build failure on x86, any suggestions?

[Blue Swirl]

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On 3/15/08, Peter Volkov <pva@gentoo.org> wrote:
> Hello.
>
>  I just wanted to point developers attention to the following bug:
>  bugs.gentoo.org/212351 , comment #11 and further. The problem is that
>  qemu does not compile any more on x86. I've tried recent snapshot
>  (2008-03-15_05) and the problem persist there.
>
>  The problem gentoo is that previous versions are known to be affected to
>  security vulnerability so we'll have to mask it soon, while version
>  which does not build successfully will be masked too as there is no
>  reason to keep broken package in stable. Could anybody of developers
>  suggest anything on this issue? Thank you very much in advance!
>
>
>  The actual build error:
>
>  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/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386
>  -I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05 -MMD -MP -DNEED_CPU_H
>  -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
>  -I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/tcg
>  -I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/tcg/i386
>  -I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/fpu
>  -I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/linux-user
>  -I/home/pva/work/qemu/qemu-snapshot-2008-03-15_05/linux-user/i386 -c -o
>  op.o /home/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386/op.c
>  /home/pva/work/qemu/qemu-snapshot-2008-03-15_05/target-i386/ops_sse.h:
>  In function `op_psrlq_mmx':

I can't replicate this bug, but does this patch (NB: not  a real fix)
make the compile successful or does it fail later somewhere else?

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