Error on extern "C" pointer argument

Question

Hi,
I am seeing the following formal argument error, which I assume to be a compiler bug:
In gmp.h there is following declaration:
extern "C"
void mp_get_memory_functions __GMP_PROTO ((void *(**) (size_t),
void *(**) (void *, size_t, size_t),
void (**) (void *, size_t)));
In gmpxx.h there is following usage:
struct __gmp_alloc_cstring
char *str;
__gmp_alloc_cstring(char *s) { str = s; }
~__gmp_alloc_cstring()
void (*freefunc) (void *, size_t);
mp_get_memory_functions (NULL, NULL, &freefunc);
(*freefunc) (str, std::strlen(str)+1);
This causes following error message:
"/usr/include/gmpxx.h", line 1301: Error: Formal argument 3 of type extern "C" void(*)(void*,unsigned)* in call to __gmp_get_memory_functions(extern "C" void*(*)(unsigned)*, extern "C" void*(*)(void*,unsigned,unsigned)*, extern "C" void(*)(void*,unsigned)*) is being passed void(*)(void*,unsigned)*.
As it is impossible to define freefunc as 'extern "C" void (*freefunc)(void *, size_t)', because it is rejected as local symbols may not have file linkage, I assume this might be a compiler bug...
What do you guys think?
- Thomas

Answer 1

That's libgmp version 4.2.2, which is included in Nexenta-3.0rc2.
OpenCSW also only has 4.2.2.
Installing 5.0.1 seems to fix the issue.
Thanks,
Thomas