Bug#1135526: Possible miscompilation at -O2

David Bremner <[email protected]> writes:

>
> Element 0 of reply_to_map gets field get_header initialized properly
> with O1 but set to 0x0 at level O2. The latter is of course fatal
> when the code just below tries to call through this table.
> The other elements of the table look OK.
>
>     struct {
> 	InternetAddressList * (*get_header)(GMimeMessage *message);
> 	GMimeAddressType recipient_type;
>     } reply_to_map[] = {
> 	{ get_sender,   GMIME_ADDRESS_TYPE_TO },
> 	{ get_to,       GMIME_ADDRESS_TYPE_TO },
> 	{ get_cc,       GMIME_ADDRESS_TYPE_CC },
> 	{ get_bcc,      GMIME_ADDRESS_TYPE_BCC },
>     };
>

I learned that declaring this array as static const seems to fix the
initialization, although I'm not really sure how to interpret that.