[GHC] #10066: Cross compiling from Linux to Windows fails

[GHC]

#10066: Cross compiling from Linux to Windows fails
-------------------------------------+-------------------------------------
              Reporter:  erikd       |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.12.1
             Component:  Compiler    |           Version:  7.10.1-rc2
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
-------------------------------------+-------------------------------------
 Building from git HEAD (daed18c35cda1) and configuring with:

 {{{
 ./configure --target=i686-w64-mingw32
 }}}

 The build then fails with:

 {{{
 utils/hsc2hs/dist/build/Main.o: In function `c4tf_info':
 (.text+0x80a): undefined reference to `GetModuleFileNameW'
 }}}

 but earlier on there was other suspicious output like:

 {{{
 utils/hsc2hs/Main.hs:234:1: Warning:
     the 'stdcall' calling convention is unsupported on this platform,
     treating as ccall
     When checking declaration:
       foreign import stdcall unsafe "static windows.h
         GetModuleFileNameW" c_GetModuleFileName
         :: Ptr () -> CWString -> Word32 -> IO Word32
 }}}

 which suggests that the cross tool chain is not being used. However, the
 configure process did indeed find the right cross compilers and linkers.
 From the configure output:

 {{{

    Building GHC version  : 7.11.20150204
           Git commit id  : daed18c35cda114d8a5303bcb645195e1fd397e3

    Build platform        : x86_64-unknown-linux
    Host platform         : x86_64-unknown-linux
    Target platform       : i386-unknown-mingw32

    Bootstrapping using   : /usr/bin/ghc
       which is version   : 7.8.3

    Using gcc                 : /usr/bin/i686-w64-mingw32-gcc
       which is version       : 4.9.2
    Building a cross compiler : YES
    cpp       : /usr/bin/i686-w64-mingw32-gcc
    cpp-flags : -E -undef -traditional
    ld        : /usr/bin/i686-w64-mingw32-ld

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10066>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler