On 07/27/15 20:31, Scott Duplichan wrote:
> The gcc -Wformat messages are usually clear, but I found one misleading:
> format '%g' expects argument of type 'void *', but argument 4 has type
> 'EFI_GUID {aka struct <anonymous>
> In this case, the entire GUID struct is being passed instead of the GUID
> address
> (due to missing '&').
The really strange thing here is that, although the warning is correct,
the code does not print garbage; it prints the right GUID. It's as if
the structure automatically decayed to a pointer through the ellipsis.
Thanks
Laszlo
> The full lists are attached (made with GCC_EXTRA_CC_FLAGS=-Wno-error). Let me
> know of
> anything wrong you see. I am going to try to perfect this checking and put it
> into the
> Windows hosted gcc tool chains.
>
> Thanks,
> Scott
>
>
> ]For gcc/clang this syntax enables all the printf format string vs. argument
> warns for my_printf that exist ]with printf.
> ]int my_printf (void *my_object, const char *my_format, ...) __attribute__
> ((format (printf, 2, 3)));
> ]
> ]It might be possible to add a format attribute to a function that could
> check the calling conventions, but ]the optimizations may happen too late to
> help?
> ]
> ]Thanks,
> ]
> ]Andrew Fish
> ]
> ]> --
> ]> dwmw2
> ]>
> ]> --
> ]> David Woodhouse Open Source Technology Centre
> ]> david.woodho...@intel.com Intel Corporation
>
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