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[build] Fix strict-aliasing warning on older gcc versions 

Reported-by: James A. Peltier <jpeltier@sfu.ca>
Reported-by: Matthew Helton <mwhelton@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/39/head
Michael Brown 2015-07-27 23:28:01 +01:00
parent 657dd5f76d
commit fae7a5310a
1 changed files with 8 additions and 4 deletions
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12
src/crypto/aes.c
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@ -156,13 +156,17 @@ static struct aes_table aes_invmixcolumns;
*/
static inline __attribute__ (( always_inline )) uint32_t
aes_entry_column ( const union aes_table_entry *entry, unsigned int column ) {
const uint8_t *first __attribute__ (( may_alias ));
const union {
uint8_t byte;
uint32_t column;
} __attribute__ (( may_alias )) *product;
/* Locate start of relevant four-byte subset */
first = &entry->byte[ 4 - column ];
/* Locate relevant four-byte subset */
product = container_of ( &entry->byte[ 4 - column ],
typeof ( *product ), byte );
/* Extract this four-byte subset */
return ( *( ( uint32_t * ) first ) );
return product->column;
}
/**