[GHC] #3117: via C compilation of module importing log1p from <math.h> fails.

[GHC]

#3117: via C compilation of module importing log1p from <math.h> fails.
-----------------------------+----------------------------------------------
Reporter:  int-e             |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  6.10.1            |       Severity:  normal          
Keywords:                    |       Testcase:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 This module fails to compile:
 {{{
 {-# LANGUAGE ForeignFunctionInterface #-}
 {-# OPTIONS_GHC -fvia-C #-}

 foreign import ccall unsafe "math.h log1p" log1p :: Double -> Double

 main = print (log1p 1)
 }}}
 With errors like these:
 {{{
 /tmp/ghc25313_0/ghc25313_0.hc: In function 'svD_entry':

 /tmp/ghc25313_0/ghc25313_0.hc:66:0:
      error: 'log1p' redeclared as different kind of symbol

 /usr/include/bits/mathcalls.h:132:0:
      error: previous declaration of 'log1p' was here
 }}}
 This is affecting the {{{logfloat}}} package on hackage.

 The reason is that {{{ghc}}} doesn't generate proper prototypes for
 foreign imports, but that's probably ok as long as no conflicting
 prototypes are defined for the same function.

 To accomplish this, {{{ghc}}} treats functions from {{{math.h}}}
 specially, but a number of these functions like {{{log1p}}} are not
 recognized. See {{{compiler/cmm/CLabel.hs}}}.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3117>
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