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

From: Alexander Graf
Subject: Re: [Qemu-devel] build failure on x86, any suggestions?
Date: Sat, 15 Mar 2008 20:45:08 +0100
User-agent: Thunderbird (X11/20070801)

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.


--- 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 */

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