Not detecting clang correctly

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.

Edited Mar 10, 2019 by erikd

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