Flag warnings show intermediate hscpp filenames on SmartOS

[Karel Gardas]

Hi Alain,

I guess you are hit by well known issue in GCC's CPP on Solaris. Just 
verify here:

https://gcc.gnu.org/ml/gcc/2014-08/msg00114.html

solution in this case is simple: use configure option to set different 
non buggy CPP as a CPP for GHC.

Please let me know if this is the culprit,

Thanks,
Karel

On 12/31/15 08:09 AM, Alain O'Dea wrote:
> On SmartOS GHC flag warnings show up like this:
> /tmp/ghc72341_0/ghc_1.hscpp:7:16: Warning:
>      -fffi is deprecated: use -XForeignFunctionInterface or pragma {-#
> LANGUAGE ForeignFunctionInterface #-} instead
>
> It appears that this line in DriverPipeline leads to the correct
> filename in warnings on Ubuntu, but not on SmartOS:
> src_opts <- liftIO $ getOptionsFromFile dflags0 output_fn
> https://github.com/ghc/ghc/blob/bb7f2e33197e667eb694bd1243f125c722a0a868/compiler/main/DriverPipeline.hs#L865
>
> How does the intermediate hscpp filename get restored to a correct
> filename if warnings are generated during a re-read of the pragmas after
> having preprocessed the file?
>
> Full investigation notes are here (rambling and unedited):
> https://gist.github.com/AlainODea/98141991849093285c52
>
>
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