[GHC] #12171: cygwin - option to accept ISO C99... unsupported

[GHC]

#12171: cygwin - option to accept ISO C99... unsupported
-------------------------------------+-------------------------------------
           Reporter:  wozgonon       |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.0.1
           Keywords:                 |  Operating System:  Windows
       Architecture:  x86            |   Type of failure:  Building GHC
                                     |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Tried to build Haskell under cygwin under Windows 10 (x86_64) but
 /configure failed.  I had a look on google and through the bug tracker but
 could not find anything helpful.

 Note that in the output from ./configure check two versions of gcc.exe
 1) ... /ghc/inplace/mingw/bin/gcc.exe
 2) C:/Program Files/Haskell Platform/8.0.1/lib/../mingw/bin/gcc.exe

 The check for the first succeeds but that for the second fails yet they
 both seem to be the same version of gcc.exe: (realgcc.exe (Rev3, Built by
 MSYS2 project) 5.2.0)


 {{{
 checking for
 C:/unix/cygwin64/home/jb/haskell/ghc/inplace/mingw/bin/gcc.exe option to
 accept ISO C99... none needed
 checking for C:/Program Files/Haskell
 Platform/8.0.1/lib/../mingw/bin/gcc.exe option to accept ISO C99...
 unsupported
 }}}

 {{{
 $ C:/unix/cygwin64/home/jb/haskell/ghc/inplace/mingw/bin/gcc.exe --version
 realgcc.exe (Rev3, Built by MSYS2 project) 5.2.0
 Copyright (C) 2015 Free Software Foundation, Inc.
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
 PURPOSE.

 jb at fabulord ~/haskell/ghc
 $ "C:/Program Files/Haskell Platform/8.0.1/lib/../mingw/bin/gcc.exe"
 --version
 realgcc.exe (Rev3, Built by MSYS2 project) 5.2.0
 Copyright (C) 2015 Free Software Foundation, Inc.
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
 PURPOSE.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12171>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler