On Wed, 7 Mar 2012, Richard Guenther wrote:

> Now, convert.c is used from all frontends to implement convert ()
> (that looks backwards - the language convert should be a langhook,
> called from convert implemented in convert.c).  But well, I aint
> not touching this beast ;)

I don't think convert () should be a langhook; it's all about 
language-specific semantics (the only non-front-end places calling it, 
outside of convert.c itself, now appear to be in arm.c).

I'm not sure of the extent to which the recursive calls to convert inside 
convert.c need any language-specific semantics.  To the extent that they 
do, I think front ends should be dealing with the semantics rather than 
having convert call back into the front end.  (I also think all the errors 
from convert.c should be given by front ends instead; front ends should 
only call the convert_to_* helpers for code they have checked is valid.)

Joseph S. Myers

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