Re: [Xen-devel] PIC register 'bx' clobbered in 'asm' - xen-unstable build error

[Bin Ren <bin.ren@xxxxxxxxx>]

A patch has been proposed by Vincent Hanquez. I've already pushed it
into the unstable tree. The problem happens with gcc 3.4

Bin

--- xeno-unstable.bk/tools/libxc/xc_vmx_build.c.orig    2005-02-09
13:50:48 +0100
+++ xeno-unstable.bk/tools/libxc/xc_vmx_build.c 2005-02-09 13:51:33 +0100
@@ -426,10 +426,10 @@
{
    int eax, ecx;

-    __asm__ __volatile__ ("cpuid"
+    __asm__ __volatile__ ("pushl %%ebx; cpuid; popl %%ebx"
                         : "=a" (eax), "=c" (ecx)
                         : "0" (1)
-                         : "bx", "dx");
+                         : "dx");
    if (!(ecx & VMX_FEATURE_FLAG)) {
        return -1;
    }


On Fri, 25 Feb 2005 15:02:30 -0600, David F Barrera <dfbp@xxxxxxxxxx> wrote:
> I am trying to build xen-unstable on an x86 box, but it is failing with
> the following message:
> 
> gcc  -DPIC -m32 -march=i686 -Wall -Werror -O3 -fno-strict-aliasing -I
> ../../tools/libxutil -I. -Wp,-MD,.xc_rrobin.opic.d -fPIC -c -o
> xc_rrobin.opic xc_rrobin.c
> gcc  -DPIC -m32 -march=i686 -Wall -Werror -O3 -fno-strict-aliasing -I
> ../../tools/libxutil -I. -Wp,-MD,.xc_vmx_build.opic.d -fPIC -c -o
> xc_vmx_build.opic xc_vmx_build.c
> xc_vmx_build.c: In function `vmx_identify':
> xc_vmx_build.c:468: error: PIC register `bx' clobbered in `asm'
> make[4]: *** [xc_vmx_build.opic] Error 1
> make[4]: Leaving directory `/tmp/xen-unstable/tools/libxc'
> make[3]: *** [all] Error 2
> make[3]: Leaving directory `/tmp/xen-unstable/tools/libxc'
> make[2]: *** [install] Error 2
> make[2]: Leaving directory `/tmp/xen-unstable/tools'
> make[1]: *** [tools] Error 2
> make[1]: Leaving directory `/tmp/xen-unstable'
> make: *** [world] Error 2
> make world failed
> 
> I have built xen-unstable on this machine before, so I don't believe it
> is a setup problem.  Has anyone else observed this?
> 
> David F Barrera
> 
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