llvm dev - Mar 2016 - clang triple and clang target

On Sat, Mar 12, 2016 at 2:38 PM, Tim Northover <t.p.northover at
gmail.com>
wrote:
> On 12 March 2016 at 11:51, Rail Shafigulin via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > I tried every possible combination of --target I could think of but
> nothing
> > worked. Would you mind helping me out?
>
> First, 64-bit x86 is "x86_64", and 32-bit is "i386" in
the triple. For
> ARM you'd probably want "thumbv8" or "aarch64".
Also, "eabi" is only a
> thing on ARM targets, try "gnu" for x86.
>
> Cheers.
>
> Tim.
>
Hi Tim.

Thanks for the response. I tried the x86 suggestion but it didn't work.
Clearly I'm doing something wrong, but I don't know what exactly. I
would
really appreciate your help in this. Here is the command line I'm using

clang -S test.c -o test.sse2.x86_64.s --target=x86_64-pc-linux-gnu
-mfloat-abi=hard -mcpu=k8 -mfpu=SSE2 -fslp-vectorize-aggressive
-fslp-vectorize-aggressive -fslp-vectorize -fvectorize
-fno-lax-vector-conversions -O3

Here is the response that I get:

clang-3.5: warning: argument unused during compilation:
'-mfloat-abi=hard'
clang-3.5: warning: argument unused during compilation: '-mcpu=k8'
clang-3.5: warning: argument unused during compilation: '-mfpu=SSE2'
error: unable to create target: 'No available targets are compatible with
this triple, see -version for the available targets.'

clang --version command produces the following result:

clang version 3.5.0
Target: x86_64-unknown-linux-gnu
Thread model: posix

test.c is attached to this email.

So what am I doing wrong?

-- 
Rail Shafigulin
Software Engineer
Esencia Technologies
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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.

As --version output, your native target triple is:
 x86_64-unknown-linux-gnu, & for cross-compilation need to check the build
make file settings.

try with x86_64-unknown-linux-gnu, for linux-X86 target.

*This is related to llvm 3.9.0,*

  if (LLVM_NATIVE_ARCH MATCHES "i[2-6]86")
  set(LLVM_NATIVE_ARCH X86)
elseif (LLVM_NATIVE_ARCH STREQUAL "x86")
  set(LLVM_NATIVE_ARCH X86)
elseif (LLVM_NATIVE_ARCH STREQUAL "amd64")
  set(LLVM_NATIVE_ARCH X86)
elseif (LLVM_NATIVE_ARCH STREQUAL "x86_64")
  set(LLVM_NATIVE_ARCH X86)
elseif (LLVM_NATIVE_ARCH MATCHES "sparc")
  set(LLVM_NATIVE_ARCH Sparc)
elseif (LLVM_NATIVE_ARCH MATCHES "powerpc")
  set(LLVM_NATIVE_ARCH PowerPC)
elseif (LLVM_NATIVE_ARCH MATCHES "aarch64")
  set(LLVM_NATIVE_ARCH AArch64)
elseif (LLVM_NATIVE_ARCH MATCHES "arm64")
  set(LLVM_NATIVE_ARCH AArch64)
elseif (LLVM_NATIVE_ARCH MATCHES "arm")
  set(LLVM_NATIVE_ARCH ARM)
elseif (LLVM_NATIVE_ARCH MATCHES "mips")
  set(LLVM_NATIVE_ARCH Mips)
elseif (LLVM_NATIVE_ARCH MATCHES "xcore")
  set(LLVM_NATIVE_ARCH XCore)
elseif (LLVM_NATIVE_ARCH MATCHES "msp430")
  set(LLVM_NATIVE_ARCH MSP430)
elseif (LLVM_NATIVE_ARCH MATCHES "hexagon")
  set(LLVM_NATIVE_ARCH Hexagon)
elseif (LLVM_NATIVE_ARCH MATCHES "s390x")
  set(LLVM_NATIVE_ARCH SystemZ)
elseif (LLVM_NATIVE_ARCH MATCHES "wasm32")
  set(LLVM_NATIVE_ARCH WebAssembly)
elseif (LLVM_NATIVE_ARCH MATCHES "wasm64")
  set(LLVM_NATIVE_ARCH WebAssembly)
else ()
  message(FATAL_ERROR "Unknown architecture ${LLVM_NATIVE_ARCH}")
endif ()


On Tue, Mar 15, 2016 at 12:07 AM, Rail Shafigulin via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
>
>
> On Sat, Mar 12, 2016 at 2:38 PM, Tim Northover <t.p.northover at
gmail.com>
> wrote:
>
>> On 12 March 2016 at 11:51, Rail Shafigulin via llvm-dev
>> <llvm-dev at lists.llvm.org> wrote:
>> > I tried every possible combination of --target I could think of
but
>> nothing
>> > worked. Would you mind helping me out?
>>
>> First, 64-bit x86 is "x86_64", and 32-bit is "i386"
in the triple. For
>> ARM you'd probably want "thumbv8" or "aarch64".
Also, "eabi" is only a
>> thing on ARM targets, try "gnu" for x86.
>>
>> Cheers.
>>
>> Tim.
>>
>
> Hi Tim.
>
> Thanks for the response. I tried the x86 suggestion but it didn't work.
> Clearly I'm doing something wrong, but I don't know what exactly. I
would
> really appreciate your help in this. Here is the command line I'm using
>
> clang -S test.c -o test.sse2.x86_64.s --target=x86_64-pc-linux-gnu
> -mfloat-abi=hard -mcpu=k8 -mfpu=SSE2 -fslp-vectorize-aggressive
> -fslp-vectorize-aggressive -fslp-vectorize -fvectorize
> -fno-lax-vector-conversions -O3
>
> Here is the response that I get:
>
> clang-3.5: warning: argument unused during compilation:
'-mfloat-abi=hard'
> clang-3.5: warning: argument unused during compilation: '-mcpu=k8'
> clang-3.5: warning: argument unused during compilation:
'-mfpu=SSE2'
> error: unable to create target: 'No available targets are compatible
with
> this triple, see -version for the available targets.'
>
> clang --version command produces the following result:
>
> clang version 3.5.0
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
>
> test.c is attached to this email.
>
> So what am I doing wrong?
>
> --
> Rail Shafigulin
> Software Engineer
> Esencia Technologies
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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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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