Hi Harendra, I ran into this very problem recently. Turns out -traditional knows string concatenation too. I seem to remember learning this by browsing the GHC source code, but now I can't find any occurrence of this pattern. But here's an example of how to do string concatenation with CPP in -traditional mode: https://github.com/tweag/sparkle/blob/a4e481aa5180b6ec93c219f827aefe932b66a953/inline-java/src/Foreign/JNI.hs#L274 .
HTH, -- Mathieu Boespflug Founder at http://tweag.io. On 20 August 2016 at 20:33, Brandon Allbery <allber...@gmail.com> wrote: > On Sat, Aug 20, 2016 at 2:27 PM, Harendra Kumar <harendra.ku...@gmail.com> > wrote: > >> But "-optP" seems to only append to the flags that GHC already passes and >> gcc has no "-no-traditional" option to undo the effect of the >> "-traditional" that GHC has already passed. I think "-optP" should override >> the flags passed by ghc rather than appending to them. Is there a reason >> not to do that? >> >> Is there any other better way to achieve this? What is the standard way >> of doing this if any? >> > > Removing -traditional will break much Haskell source. Go look at the > history of clang with ghc (clang doesn't do -traditional) to see what > happens. (tl;dr: without -traditional, cpp knows too much about what > constitutes valid C, and mangles and/or throws errors on valid Haskell that > doesn't lex the way C does.) > > You might want to look at cpphs as an alternative preprocessor. There are > some ancient K&R-era hacks that could be used if absolutely necessary, but > cpphs should be a much simpler and cleaner solution. > > -- > brandon s allbery kf8nh sine nomine > associates > allber...@gmail.com > ballb...@sinenomine.net > unix, openafs, kerberos, infrastructure, xmonad > http://sinenomine.net > > _______________________________________________ > ghc-devs mailing list > ghc-d...@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > >
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