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Date: Fri, 31 Oct 2008 12:14:40 +0100
From: =?windows-1252?Q?V=E1clav_Haisman?= <v DOT haisman AT sh DOT cvut DOT cz>
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Subject: Re: cygwin g++ strictness
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John Emmas wrote:
> ----- Original Message ----- From: "John Emmas"
> Sent: 31 October 2008 08:21
> Subject: Re: cygwin g++ strictness
>>
>> adding the compiler flag -fpermissive seems to have solved the problem.
>>
> 
> 
> ----- Original Message ----- From: "Václav Haisman"
> Sent: 31 October 2008 10:07
> Subject: Re: cygwin g++ strictness
>>
>> It just works. You are doing something wrong. There is nothing wrong
>> with GCC 3.4 in this respect.
>>
> 
> It seems like I spoke to soon.....  -fpermissive seems to have helped in
> some cases but not in every case.  I'll give an example. Please can someone
> tell me if I'm misunderstanding something here.  Consider the following
> function prototype (where 'gint' is typedef'd as an int in gtypes.h):-
> 
> #include <gtypes.h>
> int AddTwoInts (gint& a, gint& b);
> 
> This code compiles under both Linux/gcc4.4 and also under Cygwin:-
> gint x = 4;
> gint y = 5;
> int z = AddTwoInts (x, y);
> 
> This code compiles under Linux/gcc4.4 but not under Cygwin:-
> #include <sys/types.h>   // typedefs int32_t as int
> int32_t x = 4;
> int32_t y = 5;
> int z = AddTwoInts (x, y);
Check what type is gint really is. I suspect the gint will be typedef
for long. Long and int are two different types even though they are both
32bits wide on 32bit platforms. Either declare x, y as gint or use
temporaries for the AddTwoInts() call.

> 
> The last example produces this error on my system:-
> error: no matching function for call to `AddTwoInts(int32_t&, int32_t&)'
> note: candidates are: int AddTwoInts(gint&, gint&)
[...]

- --
VH
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