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Talk:FFI complete examples

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(FIXED IT!!!)
(Replacing page with 'How does one interface with a C enum?')
 
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Update: The following problem is solved by renaming charm.hs to hscharm.hs, so that the corresponding charm.o doesn't override the charm.o produced during compilation of charm.c.
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How does one interface with a C enum?
 
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ncurses is proving too difficult to setup, so I'm working on a new library called charm. The C code works by itself, but I can't compile a Haskell wrapper for it. While the tutorials at HaskellWiki are helpful, they're outdated. Argh! The docs say that -#include pragmas no longer work, but fail to explain how to load code without them. Suffice to say I have no recourse but trial and error.
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charm
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[https://github.com/mcandre/charm]
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hscharm
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[https://github.com/mcandre/hscharm]
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$ make
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cp /usr/include/charm.c .
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ghc --make -fforce-recomp -o hellocharm hellocharm.hs charm.hs charm.c -I/usr/include -dylib-install-name /usr/lib/libcharm.dynlib
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[1 of 2] Compiling Charm            ( charm.hs, charm.o )
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[2 of 2] Compiling Main            ( hellocharm.hs, hellocharm.o )
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Linking hellocharm ...
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ld: duplicate symbol _Charm_getWidth_info in charm.o and charm.o
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collect2: ld returned 1 exit status
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make: *** [hellocharm] Error 1
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Latest revision as of 07:34, 14 July 2011

How does one interface with a C enum?