CPP Help (was Re: Latest Template Haskell Breaks Package)

[Francesco Mazzoli]

I forgot to mention that `cpphs' can mimick gcc's cpp, with the flag
`-cpp'.  In Agda we have

    ghc-options: -pgmPcpphs -optP--cpp

Francesco

On 24 December 2014 at 10:50, Francesco Mazzoli <f at mazzo.li> wrote:
> You can specify the pre-processor in the `ghc-options' field in the
> cabal file, e.g.
>
>     ghc-options: -pgmPcpphs
>
> Francesco
>
> On 23 December 2014 at 17:14, Brandon Allbery <allbery.b at gmail.com> wrote:
>> On Tue, Dec 23, 2014 at 11:10 AM, Dominic Steinitz <dominic at steinitz.org>
>> wrote:
>>>
>>> How very clever of you and thank you very much. Changing ‘ to 1 does fix
>>> the problem.
>>>
>>> I would have thought this would work
>>>
>>> cabal install --with-gcc=gcc-4.9
>>>
>>>
>>> But sadly I still got the same error.
>>
>>
>> I think that changes the gcc cabal uses to compile C code, but does not
>> affect how ghc invokes cpp. Or put otherwise, there are too many ways that a
>> C compiler can be dragged into the build pipeline (building C code
>> explicitly [via cabal or via ghc foo.c, two different cases], wrapped FFI
>> calls in ghc, -fvia-C, CPP, ...).
>>
>> --
>> brandon s allbery kf8nh                               sine nomine associates
>> allbery.b at gmail.com                                  ballbery at sinenomine.net
>> unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
>>
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