clang: how to list supported target architectures?

Question

Currently I am interested in ARM in general and specifically iphone/android targets. But I just want to know more about clang, since it feels to play important role in the y

Answer 1

clang -march=dont-know empty.c

error: unknown target CPU 'dont-know'

note: valid target CPU values are: nocona, core2, penryn, bonnell, atom, silvermont, slm, goldmont, goldmont-plus, tremont, nehalem, corei7, westmere, sandybridge, corei7-avx, ivybridge, core-avx-i, haswell, core-avx2, broadwell, skylake, skylake-avx512, skx, cascadelake, cooperlake, cannonlake, icelake-client, icelake-server, tigerlake, knl, knm, k8, athlon64, athlon-fx, opteron, k8-sse3, athlon64-sse3, opteron-sse3, amdfam10, barcelona, btver1, btver2, bdver1, bdver2, bdver3, bdver4, znver1, znver2, x86-64

Answer 2

One hint you can do: if you're trying to find a particular target triple, is to install llvm on that system then do a

$ llc --version | grep Default
  Default target: x86_64-apple-darwin16.1.0

or alternatively:

$ llvm-config --host-target
x86_64-apple-darwin16.0.0
or
$ clang -v 2>&1 | grep Target
Target: x86_64-apple-darwin16.1.0

Then you know how to target it when cross compiling anyway.

Apparently there are "lots" of targets out there, here's a list, feel free to add to it, community wiki style:

arm-none-eabi
armv7a-none-eabi
arm-linux-gnueabihf 
arm-none-linux-gnueabi
i386-pc-linux-gnu 
x86_64-apple-darwin10
i686-w64-windows-gnu # same as i686-w64-mingw32
x86_64-pc-linux-gnu # from ubuntu 64 bit
x86_64-unknown-windows-cygnus # cygwin 64-bit
x86_64-w64-windows-gnu # same as x86_64-w64-mingw32
i686-pc-windows-gnu # MSVC
x86_64-pc-windows-gnu # MSVC 64-BIT

Here's what the docs list anyway (apparently it's a quadruple [or quintuple?] instead of a triple these days):

The triple has the general format <arch><sub>-<vendor>-<sys>-<abi>, where:
arch = x86, arm, thumb, mips, etc.
sub = for ex. on ARM: v5, v6m, v7a, v7m, etc.
vendor = pc, apple, nvidia, ibm, etc.
sys = none, linux, win32, darwin, cuda, etc.
abi = eabi, gnu, android, macho, elf, etc.

and you can even fine tune specify a target cpu beyond this, though it uses a sensible default for the target cpu based on the triple.

Sometimes targets "resolve" to the same thing, so to see what a target is actually treated as:

 $ clang -target x86_64-w64-mingw32 -v 2>&1 | grep Target
 Target: x86_64-w64-windows-gnu

Answer 3

According to Jonathan Roelofs in this talk “Which targets does Clang support?”:

$ llc --version
LLVM (http://llvm.org/):
  LLVM version 3.6.0
  Optimized build with assertions.
  Built Apr  2 2015 (01:25:22).
  Default target: x86_64-apple-darwin12.6.0
  Host CPU: corei7-avx

  Registered Targets:
    aarch64    - AArch64 (little endian)
    aarch64_be - AArch64 (big endian)
    amdgcn     - AMD GCN GPUs
    arm        - ARM
    arm64      - ARM64 (little endian)
    armeb      - ARM (big endian)
    cpp        - C++ backend
    hexagon    - Hexagon
    mips       - Mips
    mips64     - Mips64 [experimental]
    mips64el   - Mips64el [experimental]
    mipsel     - Mipsel
    msp430     - MSP430 [experimental]
    nvptx      - NVIDIA PTX 32-bit
    nvptx64    - NVIDIA PTX 64-bit
    ppc32      - PowerPC 32
    ppc64      - PowerPC 64
    ppc64le    - PowerPC 64 LE
    r600       - AMD GPUs HD2XXX-HD6XXX
    sparc      - Sparc
    sparcv9    - Sparc V9
    systemz    - SystemZ
    thumb      - Thumb
    thumbeb    - Thumb (big endian)
    x86        - 32-bit X86: Pentium-Pro and above
    x86-64     - 64-bit X86: EM64T and AMD64
    xcore      - XCore

Future versions of Clang may provide the following. They are listed as "proposed" though not yet available at least as of v 3.9.0:

$ clang -target <target_from_list_above> --print-multi-libs
$ clang -print-supported-archs
$ clang -march x86 -print-supported-systems 
$ clang -march x86 -print-available-systems