[GHC] #16019: Harbormaster: OS X build fails

[GHC]

#16019: Harbormaster: OS X build fails
-------------------------------------+-------------------------------------
           Reporter:  trommler       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:
          Component:  Runtime        |           Version:  8.7
  System                             |
           Keywords:                 |  Operating System:  MacOS X
       Architecture:                 |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 From Build 64479 https://phabricator.haskell.org/harbormaster/build/64479/
 {{{
 rts/sm/CNF.c:1002:13: error:
 486          error: declaration does not declare anything [-Werror
 ,-Wmissing-declarations]
 487                     FALLTHROUGH;
 488                     ^
 489          |
 490     1002 |             FALLTHROUGH;
 491          |             ^
 492
 493     includes/Stg.h:201:21: error:
 494          note: expanded from macro 'FALLTHROUGH'
 495         |
 496     201 | #define FALLTHROUGH GNU_ATTRIBUTE(fallthrough)
 497         |                     ^
 498     #define FALLTHROUGH GNU_ATTRIBUTE(fallthrough)
 499                         ^
 500
 501     includes/Stg.h:188:27: error:
 502          note: expanded from macro 'GNU_ATTRIBUTE'
 503         |
 504     188 | #define GNU_ATTRIBUTE(at) __attribute__((at))
 505         |                           ^
 506     #define GNU_ATTRIBUTE(at) __attribute__((at))
 507                               ^
 }}}

 Marking this as highest priority because it is a regression and it breaks
 CI.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16019>
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