[GHC] #3844: Undeprecate #include (in at least some circumstances)

[GHC]

#3844: Undeprecate #include (in at least some circumstances)
-------------------------------+--------------------------------------------
    Reporter:  cjs             |       Owner:                                   
        Type:  bug             |      Status:  new                              
    Priority:  normal          |   Component:  Compiler (FFI)                   
     Version:  6.12.1          |    Keywords:  #include deprecation             
          Os:  Linux           |    Testcase:                                   
Architecture:  x86_64 (amd64)  |     Failure:  Incorrect warning at compile-time
-------------------------------+--------------------------------------------
 The attached program generates a warning: "Warning: -#include is
 deprecated: No longer has any effect". However, if I remove the #include,
 it fails to compile with:


 {{{
 Fixes.hsc: In function ‘main’:
 Fixes.hsc:29: error: ‘SOL_SOCKET’ undeclared (first use in this function)
 Fixes.hsc:29: error: (Each undeclared identifier is reported only once
 Fixes.hsc:29: error: for each function it appears in.)
 Fixes.hsc:29: error: ‘SO_LINGER’ undeclared (first use in this function)
 Fixes.hsc:37: error: invalid application of ‘sizeof’ to incomplete type
 ‘struct linger’
 Fixes.hsc:40: error: invalid use of undefined type ‘struct linger’
 Fixes.hsc:41: error: invalid use of undefined type ‘struct linger’
 }}}

 Evidently it's not quite true that #include no longer has any effect.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3844>
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