I'm using gcc to compile plan9 code from some time (4.7/4.8) and that
option are masking real behaviour. Do not warns or put out an error about
"anonymous structs", but you will have a conflict if to structs in the same
source are including a, for example, "Lock;" element, and ld could not
assign right the values if declarations are not specified ansi style
(variable initialization it's made by ld, not by the compiler): you will
get some dragons in some cases.
Look at LP49 source code and you will see that authors used your second way.

Álvaro Jurado Cuevas
colmenar.biz.tm

2014-10-07 17:58 GMT+02:00 Carsten Kunze <carsten.ku...@arcor.de>:

> > Otherwise, your change is fine, but "hdr" would probably be
> > a better name than "Biobufhdr". Also, don't forget to update
> > your code to use b->hdr.fid instead of b->fid, and so on.
>
> Thanks for all answers!
>
> (They also helped to find a short documentation in /sys/doc/compiler)
>
>    Carsten
>
>

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