Re: [Xen-devel] [PATCH 01/12] xen: clang: Support correctly cross-compile

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 28.03.19 at 11:43, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 28/03/2019 10:28, Jan Beulich wrote:
>>>>> On 28.03.19 at 11:14, <andrew.cooper3@xxxxxxxxxx> wrote:
>>> Using -target is from the Clang instructions on cross compilation, which
>>> say to do it this way.  https://clang.llvm.org/docs/CrossCompilation.html 
>>>
>>> The targets supported will depend on the configuration Clang was
>>> compiled with, but Clang specifically opposes GCC's way of requiring the
>>> user to recompile for every different target.  It is expected that a
>>> packager of clang will enable all of the supported targets in the
>>> package they distribute.
>> Are you sure a distro caring about, say, only x86 would indeed
>> enable Arm and all sorts of other architectures in the compiler,
>> just because it can be enabled? IOW I assume the need for an
>> override to the system default clang binaries would still exist.
> 
> I've just tried, and Ubuntu 16.04's default clang-3.8 is perfectly happy
> compiling Aarch64, and makes a suitable looking elf object.  (I can't
> actually disassemble it because objdump chokes, but .text is the
> expected length)
> 
> As the cross-compilation documentation states, this is a deliberate
> design decision which, amongst other things, prevents distros from
> needing to maintain per-arch packages.

All understood, just that Ubuntu may not be a good example, as
there looks to be Ubuntu 16.04 for 64-bit Arm.

Jan



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