[GHC] #10981: Not detecting clang correctly

[GHC]

#10981: Not detecting clang correctly
-------------------------------------+-------------------------------------
        Reporter:  erikd             |                Owner:  erikd
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Building GHC      |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1336
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by erikd):

 * differential:   => Phab:D1336


Old description:

> I have  Jenkins build job that builds GHC from Git using Clang as the C
> compiler.
>
> Recently a Debian update changed clang's `-v1 output to:
>
> {{{
> Debian clang version 3.5.2-2 (tags/RELEASE_352/final) (based on LLVM
> 3.5.2)
> Target: x86_64-pc-linux-gnu
> Thread model: posix
> }}}
>
> which is no longer being detected by `compiler/main/SysTools.hs` as
> `Clang`.
>
> Working around this is trivially easy. Patch in progress.

New description:

 I have  Jenkins build job that builds GHC from Git using Clang as the C
 compiler.

 Recently a Debian update changed clang's `-v` output to:

 {{{
 Debian clang version 3.5.2-2 (tags/RELEASE_352/final) (based on LLVM
 3.5.2)
 Target: x86_64-pc-linux-gnu
 Thread model: posix
 }}}

 which is no longer being detected by `compiler/main/SysTools.hs` as
 `Clang`.

 Working around this is trivially easy. Patch in progress.

--

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10981#comment:1>
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