C2HS chokes on Mac "^" block notation

[ian-ross]

Bug imported from C2HS Trac

Trac ticket created: 2010-03-18T07:36:03-0700; last modified: 2010-06-15T10:12:28-0700

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on Snow Leopard, /usr/include/stdlib.h contains Apple's new blocks notation, which c2hs seems unhappy with, despite it being protected by an #ifdef.

lines 271 onwards:

ifdef BLOCKS

int atexit_b(void (^)(void));
void *bsearch_b(const void *, const void *, size_t,
size_t, int (^)(const void *, const void *));

endif /* BLOCKS */

� hubris-0.0.2 ./Setup build
Preprocessing library hubris-0.0.2...
c2hs: C header contains errors:

/usr/include/stdlib.h:272: (column 20) [ERROR] >>> error
Syntax error !
The symbol `^' does not fit here.

[ian-ross]

Original comment date: 2010-03-18T07:37:40-0700

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eesh, that ate my formatting.

C code:

#ifdef __BLOCKS__
int      atexit_b(void (^)(void));
void    *bsearch_b(const void *, const void *, size_t,
            size_t, int (^)(const void *, const void *));
#endif /* __BLOCKS__ */

result from running c2hs:

�  hubris-0.0.2  ./Setup build   
Preprocessing library hubris-0.0.2...
c2hs: C header contains errors:

/usr/include/stdlib.h:272: (column 20) [ERROR]  >>> error
  Syntax error !
  The symbol `^' does not fit here.\

Does undefining BLOCKS help?

Otherwise we're going to have to extend language-c to parse this extension.

undefining BLOCKS does not help, I'm pretty sure that language-c will need to be extended.

As a quick workaround, you can specify to use cpp-4.0 and it seems to work:

c2hs -ccpp-4.0

on my machine cpp-4.0 seems to actually be gcc-4.0.1

Undefining BLOCKS doesn't help but undefining BLOCKS does (note the underscores). Regardless, Language.C should probably support the blocks notation, I've filed  Ticket 2 to that effect.

__BLOCKS__, I mean. Damn wiki formatting.

[ian-ross]

This needs to be tested on a MacOS machine. I don't have access to one. All it needs is to run the Cabal test suite, which should just work if this fix is OK.