Re: [XenARM] How to compile the unstable source for arm at sstabellini/xen-unstable.git/.git

[Jenny Smith <smithjenny183@xxxxxxxxx>]

On Tue, Feb 14, 2012 at 1:04 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> Please can you not top-post. It is very disruptive to the flow of the
> conversation.
>
> On Tue, 2012-02-14 at 12:44 +0000, Jenny Smith wrote:
>> For me the only way to get it working was to explicitly add
>> -fno-exceptions to the arm Rules.mk and then compiling and running Xen
>> worked.
>>
>> diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
>> index 336e209..77250e5 100644
>> --- a/xen/arch/arm/Rules.mk
>> +++ b/xen/arch/arm/Rules.mk
>> @@ -12,6 +12,7 @@ CFLAGS += -I$(BASEDIR)/include
>>
>>  # Prevent floating-point variables from creeping into Xen.
>>  CFLAGS += -msoft-float
>> +CFLAGS += -fno-exceptions -fno-unwind-tables
>
> This is very strange. Xen does not use this for other architectures and
> neither does Linux, including on arm.
>
> Which compiler is this with?

arm-none-linux-gnueabi-gcc --version
arm-none-linux-gnueabi-gcc (Sourcery CodeBench Lite 2011.09-70) 4.6.1
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


> My gcc manpage says this will only be enabled by frontends which need it
> (such as C++) and explicitly calls out the C frontend as not doing this.
> Is there anything in your environment which might cause this (e.g. do
> you have a global $CFLAGS set?)

I'm not sure. Definitely not explicitly.


> Are both -fno-excepitons and -fno-unwind-tables required or is one or
> the other sufficient by itself?

Actually just -fno-unwind-tables is sufficient. -fno-excepitons
doesn't seem to do anything.

Jenny

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