Re: Accepting "%@" in format string with __attribute__ format

[Cedric Roux <cedric.roux@acri-st.fr>]

Manfred Schwind wrote:
> Is there any chance to get gcc check my passed parameters the
> "Objective-C way" with "%@" included but still having the format
> string passed as plain old C-string? It there any other types
> than __NSString__ I could try?
> 
> BTW, is there an official list what types are accepted by __attribute__((format(...))) ?

This NSString does not seem to be recognized by gcc at all.

I see that llvm handles it.
(http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDeclAttr.cpp?revision=97103&view=markup)
Are you sure you use gcc?

Compiling:
#import <Foundation/Foundation.h>

void mlog(NSString *format, ...) __attribute__((format(__NSString__, 1, 2)));

leads to:
toto.m:3: warning: ‘__NSString__’ is an unrecognized format function type

with gcc 4.4 and GNUstep stuff.

Apart from that, the gcc documentation tells what types you can use in __attribute__ format
stuff. (Here when I do "info gcc", in the C Extensions -> Function Attributes it is
described and allowed stuff is:

`printf', `scanf', `strftime',
`gnu_printf', `gnu_scanf', `gnu_strftime' or `strfmon'.  (You can
also use `__printf__', `__scanf__', `__strftime__' or
`__strfmon__'.)  On MinGW targets, `ms_printf', `ms_scanf', and
`ms_strftime' are also present.
)

My .1 euros...