[PATCH] generated FFI ccall stub prototypes are incomplete

For generated C prototypes in which there are no arguments, the argument list should be "void", not blank. The GCC flag -Wstrict-prototypes warns about this.

To reproduce: create file Test.hs as follows

{-# OPTIONS -fffi #-} 

module Test where

foreign export ccall "foo" foo :: IO ()

foo = putStrLn "hello world"

and file use_test.c as follows:

#include "Test_stub.h"

Execute the following:

ghc -c Test.hs
gcc -Wstrict-prototypes -I/usr/lib/ghc-6.6/include -c use_test.c

(change path as appropriate). Expected output: nothing. Actual output:

In file included from use_test.c:1:
Test_stub.h:5: warning: function declaration isn’t a prototype

Patch attached.

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (FFI)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Multiple
Architecture	Multiple