[llvm-dev] clang triple and clang target

[Rail Shafigulin via llvm-dev]

On Mon, Mar 14, 2016 at 12:15 PM, Tim Northover <t.p.northover at gmail.com>
wrote:

> Hi Rail,
>
> In general we follow the GCC options, documented at
> https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for x86 (and
> similar places for ARM etc). There may be gaps in what Clang supports,
> and possibly even oddities that we support but GNU doesn't (--target
> being a case in point). But in general if you're trying to use an
> option not listed there you should expect to have a bad time of it.
>
> On 14 March 2016 at 11:37, Rail Shafigulin <rail at esenciatech.com> wrote:
> > clang-3.5: warning: argument unused during compilation:
> '-mfloat-abi=hard'
>
> Fair enough, there's no soft-float ABI for x86_64.
>
> > clang-3.5: warning: argument unused during compilation: '-mcpu=k8'
>
> x86 uses -march and -mtune instead of -mcpu.
> > clang-3.5: warning: argument unused during compilation: '-mfpu=SSE2'
>
> I believe x86 uses "-msse2" for this, but since k8 already has SSE2
> (like all 64-bit chips) it shouldn't be needed anyway.
>
> > error: unable to create target: 'No available targets are compatible with
> > this triple, see -version for the available targets.'
>
> This I can't explain. It works for me here, where are you getting your
> clang from?
>
> > clang version 3.5.0
> > Target: x86_64-unknown-linux-gnu
> > Thread model: posix
>
> Perhaps try updating Clang? Version 3.5 is getting long in the tooth now.
>
> Cheers.
>
> Tim.
>

Thanks for the info. I'm currently stuck with 3.5, can't really upgrade. As
far as not having an available target, it turns out I was using a wrong
clang binary (I have several installed). Really appreciate the help.

-- 
Rail Shafigulin
Software Engineer
Esencia Technologies
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