Hi, am I understanding the problem correctly: If one calls a variadic C function with libffi, one should use ffi_prep_cif_variadic() instead of ffi_prep_cif(), otherwise bad things may happen. Whether the function is variadic or not might not be known when looking at the source that calls ffi_prep_cif(), e.g. in the implementation of the Haskell Foreign Function Interface.
In GHC itself, ffi_prep_cif is called * in ./rts/Adjustor.c when provding Haskell code to C calls; as Haskell functions are never variadic, this is not a problem. * in ./compiler/ghci/LibFFI.hsc in the Haskell function prepForeignCall, called by generateCCall in ./compiler/ghci/ByteCodeGen.lhs. It seems that this is only relevant for ghci. This seems to imply that normal compiled Haskell code, even code that uses the Foreign Function Interface, does never call ffi_prep_cif and is therefore not affected by the problem at hand. Does this sound plausible? Greetings, Joachim -- Joachim "nomeata" Breitner Debian Developer [email protected] | ICQ# 74513189 | GPG-Keyid: 4743206C JID: [email protected] | http://people.debian.org/~nomeata
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