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Re: How to stop gcc padding structs???
- To: ecos-discuss at sources dot redhat dot com
- Subject: Re: [ECOS] How to stop gcc padding structs???
- From: "Lewin A.R.W. Edwards" <larwe at larwe dot com>
- Date: Sun, 28 Jan 2001 16:34:00 -0500
>I'm again fighting with gcc trying (and failing) to get it to
>stop putting padding bytes into structs. Have any eCosians
>figured out how to prevent gcc from padding structs?
I have had the same type of problem trying to get it working on a
structure-by-structure basis and I am running with the entire OS compiled
with packed structures.
Warning!!!! am not sure if it is caused by this act, but I have run into
another problem since doing this, and it caused much head-scratching. It
seems that if I pass a parameter by reference, and then pass that reference
down into another function, the lower function gets a pointer to garbage
rather than a pointer to the real value. So it can't properly work with or
update the parameter.
The solution to this is to create a local variable in the upper function,
and pass THAT down to the lower function, and copy the value across
afterwards. But it's very annoying.
=== Lewin A.R.W. Edwards (Embedded Engineer)
Work: http://www.digi-frame.com/
Personal: http://www.zws.com/ and http://www.larwe.com/
"Und setzet ihr nicht das Leben ein,
Nie wird euch das Leben gewonnen sein."