[cfe-commits] [PATCH] [clang] add --supported-targets option for clang

[Argyrios Kyrtzidis]

On Jan 4, 2013, at 11:41 AM, John McCall <rjmccall at apple.com> wrote:

> On Dec 20, 2012, at 11:25 PM, Saleem Abdulrasool <compnerd at compnerd.org> wrote:
>> Add a new driver-only option `--supported-targets` which enumerates the supported targets to stdout.  This is an often requested feature, allowing for a quick inspection of supported target architectures supported by a particular build of clang.
> 
> Is this for users or scripts?
> 
> For users, it would be better to squeeze this into some existing help/version option, like clang -v or clang --help.  Unfortunately, I think the format of clang -v might be tightly constrained by existing scripts to follow GCC's lead, which is why we have nonsense things like a threading model in there.

There is also clang -cc1 -version:

$ clang -cc1 -version
LLVM (http://llvm.org/):
  LLVM version 3.3svn
  DEBUG build with assertions.
  Built Jan  2 2013 (11:20:15).
  Default target: x86_64-apple-darwin12.2.0
  Host CPU: corei7

Can't we just extend it like llc ? :

$ llc -version
LLVM (http://llvm.org/):
  LLVM version 3.3svn
  DEBUG build with assertions.
  Built Jan  2 2013 (11:20:15).
  Default target: x86_64-apple-darwin12.2.0
  Host CPU: corei7

  Registered Targets:
    arm    - ARM
    thumb  - Thumb
    x86    - 32-bit X86: Pentium-Pro and above
    x86-64 - 64-bit X86: EM64T and AMD64

> 
> For scripts, rather than making a new top-level option (unless there's precedent for this one in particular), it would be better to introduce a general querying option and just make this the first parameter for it.  e.g.
>  clang --show targets
> 
> John.
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