[GHC] #10170: Find versioned versions of LLVM tools

[GHC]

#10170: Find versioned versions of LLVM tools
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        Reporter:  erikd             |                   Owner:  erikd
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler (LLVM)   |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D745
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Comment (by Erik de Castro Lopo <erikd@…>):

 In [changeset:"42448e3757f25735a0a5b5e2b7ee456b5e8b0039/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="42448e3757f25735a0a5b5e2b7ee456b5e8b0039"
 Do version specific detection of LLVM tools (#10170).

 The LLVM developers seem to make breaking changes in the LLVM IR
 language between major releases. As a consumer of the LLVM tools
 GHC now needs to be locked more tightly to a single version of
 the LLVM tools.

 GHC HEAD currently only supports LLVM version 3.6. This commit
 changes the configure script to look for `llc-3.6` and `opt-3.6`
 before looking for `llc` and `opt`. If the former are not found,
 but the later are, check that they actually are version 3.6.

 At the same time, when detecting known problems with the LLVM
 tools (ie #9439) test for it using the versions of the LLVM tools
 retrieved from the bootstrap compiler's settings file.

 Test Plan: Manual testing.

 Reviewers: thomie, rwbarton, nomeata, austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D745

 GHC Trac Issues: #10170
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10170#comment:16>
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