GHC API question: Getting access to cpp processed source

AlanKim Zimmerman

10 Sep 2013 10 Sep '13

4:03 p.m.

Hi Cafe I have just discovered that GHC.getTokenStream fails if it is used on a module with CPP directives in it. This is reported in http://ghc.haskell.org/trac/ghc/ticket/8265 Is there an easy way to get access to the pre-processed source, without having to explicitly write it to an output file in a temporary location? In other words an equivalent to getModuleSourceAndFlags that does the right thing. This currently prevents HaRe from processing files with preprocessor directives in them, I would like to come up with a workaround for current GHC versions, rather than having to wait for a future one. Regards Alan

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Carter Schonwald

10 Sep 10 Sep

6:06 p.m.

New subject: GHC API question: Getting access to cpp processed source

you need to run a preprocessor on it to remove the directives On Tue, Sep 10, 2013 at 4:03 PM, AlanKim Zimmerman wrote:

...

Hi Cafe

I have just discovered that GHC.getTokenStream fails if it is used on a module with CPP directives in it.

This is reported in http://ghc.haskell.org/trac/ghc/ticket/8265

Is there an easy way to get access to the pre-processed source, without having to explicitly write it to an output file in a temporary location?

In other words an equivalent to getModuleSourceAndFlags that does the right thing.

This currently prevents HaRe from processing files with preprocessor directives in them, I would like to come up with a workaround for current GHC versions, rather than having to wait for a future one.

Regards Alan

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Henk-Jan van Tuyl

6:54 p.m.

New subject: GHC API question: Getting access to cpp processed source

On Tue, 10 Sep 2013 22:03:16 +0200, AlanKim Zimmerman wrote:

...

Is there an easy way to get access to the pre-processed source, without having to explicitly write it to an output file in a temporary location?

You can run cpp with function readProcess, as done in function readHeaderFile in https://github.com/wxHaskell/wxHaskell/blob/master/wxdirect/src/ParseC.hs Windows does not come with cpp; one can install MinGW for this purpose. Another option could be the cpphs package; the documentation has disappeared from haskell.org, but can be found in the Web Archive[0]. Regards, Henk-Jan van Tuyl [0] http://web.archive.org/web/20100620174616/http://haskell.org/cpphs/ -- Folding@home What if you could share your unused computer power to help find a cure? In just 5 minutes you can join the world's biggest networked computer and get us closer sooner. Watch the video. http://folding.stanford.edu/ http://Van.Tuyl.eu/ http://members.chello.nl/hjgtuyl/tourdemonad.html Haskell programming --

Henk-Jan van Tuyl

6:56 p.m.

New subject: GHC API question: Getting access to cpp processed source

On Wed, 11 Sep 2013 00:54:07 +0200, Henk-Jan van Tuyl wrote:

...

Another option could be the cpphs package; the documentation has disappeared from haskell.org, but can be found in the Web Archive[0].

I just found the latest documentation at http://code.haskell.org/cpphs/docs/ Regards, Henk-Jan van Tuyl -- Folding@home What if you could share your unused computer power to help find a cure? In just 5 minutes you can join the world's biggest networked computer and get us closer sooner. Watch the video. http://folding.stanford.edu/ http://Van.Tuyl.eu/ http://members.chello.nl/hjgtuyl/tourdemonad.html Haskell programming --

AlanKim Zimmerman

11 Sep 11 Sep

2:35 a.m.

New subject: GHC API question: Getting access to cpp processed source

Thanks for the reference, but GHC already invokes the CPP. I think I am going to have to invoke a load of the module with ghc flags set to keep the output of the CPP phase, and then re-invoke it on that output to get the tokens. My question is more whether this CPP output can be kept in the GHC session for re-use, or whether I will have to mess around on the file system. Alan On Wed, Sep 11, 2013 at 12:56 AM, Henk-Jan van Tuyl wrote:

...

On Wed, 11 Sep 2013 00:54:07 +0200, Henk-Jan van Tuyl wrote:

Another option could be the cpphs package; the documentation has

...
disappeared from haskell.org, but can be found in the Web Archive[0].

I just found the latest documentation at http://code.haskell.org/cpphs/**docs/http://code.haskell.org/cpphs/docs/

Regards, Henk-Jan van Tuyl

-- Folding@home What if you could share your unused computer power to help find a cure? In just 5 minutes you can join the world's biggest networked computer and get us closer sooner. Watch the video. http://folding.stanford.edu/

http://Van.Tuyl.eu/ http://members.chello.nl/**hjgtuyl/tourdemonad.html http://members.chello.nl/hjgtuyl/tourdemonad.html Haskell programming --

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AlanKim Zimmerman
Carter Schonwald
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