Re: Warning with Lua 5.1.3 sources (gcc -pedantic)
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- Subject: Re: Warning with Lua 5.1.3 sources (gcc -pedantic)
- From: eugeny gladkih <john@...>
- Date: 2008年3月12日 23:29:26 +0300
>>>>> "AK" == Asko Kauppi <askok@dnainternet.net> writes:
AK> There is a line in Lua sources, which gives warning with gcc '-
AK> pedantic' compiler option.
AK> Has anyone found a suitable solution to this?
AK> lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
>> loadlib.c: In function ‘ll_sym’:
>> loadlib.c:77: warning: ISO C forbids conversion of object pointer to
AK> function pointer type
AK> Did some googling, and:
AK> http://www.webservertalk.com/message217658.html
AK> Which does not really show a clear solution, does it?
C++ example is following, I guess it's not easy for plain C
template<class To, class From> inline To depun_ptr( From f ) {
#if defined( _MSC_VER )
return (To)f;
#else
union { From f; To t; } u;
u.f = f;
return u.t;
#endif
}
// get rid of idiotic g++ warning
template<class T> T symbol( const char *symbol_name ) const {
return depun_ptr<T>( get_symbol( symbol_name ) );
}
get_symbol is some wrapper for dlsym():
void *dynamic_library_t::get_symbol( const char *symbol_name ) const {
#if defined( _WIN32 )
return (void*) GetProcAddress( lib_handle, symbol_name );
#elif defined( __hpux )
void* symb;
if( shl_findsym( (shl_t *)(&lib_handle),
symbol_name,
TYPE_UNDEFINED,
&symb ) != 0 )
return 0;
return symb;
#else
return dlsym( lib_handle, symbol_name );
#endif
}
I hope the idea is clean
--
Yours sincerely, Eugeny.
Doctor Web, Ltd. http://www.drweb.com
+79119997425