Re: [Xen-devel] libxl.c ERROR during compiling Xen 4.2-Unstable revision 25374

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sun, 2012-05-20 at 17:43 +0100, cyberhawk001@xxxxxxxxx wrote:
> 
>  I have had Xen 4.2-Unstable compiled a week or so ago and it all went
> fine and running, but i forget what revision i compiled now.
> 
> When i ran the xl create /etc/xen/win7.cfg to create a VM, i got an
> error about libxl and running "sudo xl list" shows the newly created
> VM, SO i just ignored that error for now. That error message was:
> 
> libxl: error: libxl.c:3117:libxl_sched_credit_domain_set: Cpu weight
> out of range, valid values are within range from 1 to 65535

This is a harmless warning and is on our list to fix for 4.2

> ---------------------------------- ----------------------------------
> ----------------------------------
> 
> SO, I noticed on the xen-unstable.hg tree that there have been a lot
> of updates to the libxl lately SO just out of curiosity, i wanted to
> get the latest revision 25374 of xen-unstable as of today 5/20/2012,
> and compile it. BUT, i cannot compile Xen anymore as the compile stops
> with warnings and error messages. 
> 
> Upon scrolling up in the terminal window, i noticed these warning or
> error messages:

Thanks, it can be useful for us to see the full context, in which case
using something like tee(1) to collect the full log and attaching it can
be useful.

> node-select.c:57:6: warning: function declaration isnât a prototype 
> [-Wstrict-prototypes]
> node-select.c: In function âvchan_wrâ:
> node-select.c:60:2: warning: ISO C90 forbids mixed declarations and code 
> [-Wdeclaration-after-statement]
> node-select.c: At top level:
> node-select.c:71:6: warning: function declaration isnât a prototype 
> [-Wstrict-prototypes]
> node-select.c: In function âstdout_wrâ:
> node-select.c:74:2: warning: ISO C90 forbids mixed declarations and code 
> [-Wdeclaration-after-statement]

These are genuine warnings but aren't causing build failures (I presume
no -Werror in that subdir).

> The error log from compiling the libSDL test is: 
> /tmp/qemu-conf--3330-.c:1:17: fatal error: SDL.h: No such file or directory

This means you are missing the SDL development package. I'm not sure if
this is optional or mandatory, nor whether this message is fatal without
more context from the build logs.

> ../xen-unstable.hg/tools/qemu-xen-traditional-dir/hw/eepro100.c:1232:5: 
> warning: âvalâ may be used uninitialized in this function [-Wuninitialized]
> 
> 
> I also get like a dozen warnings about this:
> ../tools/xenstore/compat/xs.h:1:2: warning: #warning xs.h is
> deprecated use xenstore.h instead [-Wcpp]

These are currently to be expected and are harmless.

> AND finally the compilations stops with these messages:
> libxl.c: In function âlibxl_primary_console_execâ:
> libxl.c:1233:9: error: case value â4294967295â not in enumerated type
> âlibxl_domain_typeâ [-Werror=switch]

This one is known and a fix is in progress. It's most likely this one
which is causing the actual build error.

This slipped through our testing net due to various compiler versions
being cleverer/stupider than others and so trigger more or less
warnings, this one happens only with a more modern gcc than what our
test system uses.

Ian.



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