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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: John Baldwin <jhb@freebsd.org>
References: <200907191725.n6JHPOBe049379@svn.freebsd.org>
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Date: Tue, 21 Jul 2009 17:45:20 +0200
In-Reply-To: <200907211134.23565.jhb@freebsd.org> (John Baldwin's message of
	"Tue, 21 Jul 2009 11:34:23 -0400")
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Cc: arch@freebsd.org, Gordon Tetlow <gordon@tetlows.org>
Subject: Re: svn commit: r195767 - in head: . cddl/lib cddl/lib/libctf
	cddl/lib/libdtrace gnu/lib/libdialog gnu/lib/libg2c
	gnu/lib/libobjc gnu/lib/libreadline gnu/lib/libregex lib
	lib/libalias/libalias lib/liba...
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John Baldwin <jhb@freebsd.org> writes:
> Gordon Tetlow <gordon@tetlows.org> writes:
> >  Is there a way to detect ABI changes automatically?  [...]
> I am not aware of one, and I think it would be hard to detect things like
> changes in structure layout (e.g. you can have an ABI change w/o changing
> the size if you just reorder fields).

You can catch that with a script that parses the output of cpp on the
header that defines the struct and has knowledge of the sizes of various
types and the alignment and padding rules for that particular platform.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no