Re: [Xen-devel] Clang/LLVM version requirements

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.09.12 at 16:13, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
> Il 13/09/2012 16:04, Jan Beulich ha scritto:
>>>> >> So the patch is fine by me if it covers that misalignment case.
>>>> >> But it seems a little heavy handed - I'd think that instead of the
>>>> >> sub-section, we could just create an arbitrary other section, or
>>>> >> even allow uninitialized variable (it's unclear to me why Paolo
>>>> >> wrote the comment - in c/s 25479:61dfb3da56b - regarding BSS
>>>> >> the way it is now) - after all we only need to make sure that
>>>> >> - the space gets properly allocated in trampoline.S, i.e. also in
>>>> >>   reloc.bin
>>>> >> - all accesses are PC-relative
>>>> >> Neither has anything to do with use of uninitialized variables.
>>> > 
>>> > We cannot use BSS because it doesn't appear in reloc.S.
>> That, imo, would be a binutils bug.
> 
> It's just because the flags say so.  Tim's flag magic should do it (my
> reply crossed with his).

Flags magic shouldn't be required either, since I don't think you'll
find a .o with a .bss section with the alloc flag clear. The alloc flag
set, however, means it ought to be present in the output.

Jan


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