[GHC] #15945: Unable to compile GHC from source: redefinition of '_DYNAMIC' as different kind of symbol

[GHC]

#15945: Unable to compile GHC from source: redefinition of '_DYNAMIC' as different
kind of symbol
-------------------------------------+-------------------------------------
        Reporter:  klomeli           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.6.2
      Resolution:                    |             Keywords:  clang
Operating System:  OpenBSD           |         Architecture:  x86_64
 Type of failure:  Building GHC      |  (amd64)
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5461
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"1638350f0629365f20e97554e872d85b75f48d73/ghc"
 1638350f/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1638350f0629365f20e97554e872d85b75f48d73"
 rts: fix build failure on OpenBSD (_DYNAMIC symbol collision)

 Summary:
 Build failure on OpenBSD-6.4 the the following:
 ```
 rts/RtsSymbols.c:994:1: error:
      error: redefinition of '_DYNAMIC' as different kind of symbol
     |
 994 | RTS_OPENBSD_ONLY_SYMBOLS
     | ^
 RTS_OPENBSD_ONLY_SYMBOLS
 ^
 ```

 On OpenBSD `_DYNAMIC` was always defined in `<elf.h>` headers
 but used not to be included.

 The change explicitly includes `<elf.h>` as a source of symbol definition.

 Signed-off-by: Sergei Trofimovich <slyfox at gentoo.org>

 Test Plan: build-tested on OpenBSD-6.4

 Reviewers: bgamari, erikd, simonmar

 Subscribers: rwbarton, carter

 GHC Trac Issues: #15945

 Differential Revision: https://phabricator.haskell.org/D5461
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15945#comment:5>
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