Re: With new gcc9 how to handle error from -Werror=address-of-packed-member

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On 14/02/2019 11:10, Florian Weimer wrote:
* Normand:

With new gcc9 there are new error reported by
-Werror=address-of-packed-member
How to handle such error ?

eg:
libflash/ecc.c:419:24: error: taking address of packed member of
'struct ecc64' may result in an unaligned pointer value
[-Werror=address-of-packed-member]
   419 |   memcpy(inc_uint64_by(&ecc_word.data, alignment), src,
bytes_wanted);
       |                        ^~~~~~~~~~~~~~

What does the definition of struct ecc64 look like?

Thanks,
Florian



Florian, the related struct is:
struct ecc64 {
	beint64_t data;
	uint8_t ecc;
} __attribute__((__packed__));


as per header file from:
https://github.com/open-power/skiboot/blob/skiboot-6.2.x/libflash/ecc.h#L25

--
Michel Normand




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