ghc sensitive to struct layout

[Axel Simon]

Good morning,

gcc uses a different convention from the Microsoft environment when it
comes to laying out fields in C structs, in particular bit fields. Can I
pass the -optc--mms-bitfields to ghc when it compiles via C without
negative effect? 

This flag is not implicit at the moment which I assume means that ghc
itself is not compiled with --mms-bitfields on Windows. ghc surely
includes struct declarations when it compiles the generated C files, so
the question is whether all its structs are laid out the same regardless
of which layout option one chooses.

Thank,
Axel.