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Re: [patch 1/2] Rename COMPAT_VERSION to COMPAT_VERSION_SAMEPROTO
- From: Mark Wielaard <mjw at redhat dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Mon, 29 Apr 2013 23:57:12 +0200
- Subject: Re: [patch 1/2] Rename COMPAT_VERSION to COMPAT_VERSION_SAMEPROTO
On Sun, Apr 28, 2013 at 08:44:09PM +0200, Jan Kratochvil wrote:
> index 1fa4249..9af0655 100644
> --- a/lib/ChangeLog
> +++ b/lib/ChangeLog
> @@ -1,3 +1,8 @@
> +2013-04-28 Jan Kratochvil <firstname.lastname@example.org>
> + * eu-config.h (COMPAT_VERSION): Move its __typeof part ...
> + (COMPAT_VERSION_SAMEPROTO): ... into this new wrapper. Twice.
> 2013-04-26 Jan Kratochvil <email@example.com>
> * system.h (LE64, BE64): Move here the definitions from
> diff --git a/lib/eu-config.h b/lib/eu-config.h
> index 68efb82..94eede8 100644
> --- a/lib/eu-config.h
> +++ b/lib/eu-config.h
> @@ -171,12 +171,16 @@ asm (".section predict_data, \"aw\"; .previous\n"
> # define NEW_VERSION(name, version) \
> asm (".symver " #name "," #name "@@@" #version);
> # define COMPAT_VERSION(name, version, prefix) \
> - asm (".symver _compat." #version "." #name "," #name "@" #version); \
> + asm (".symver _compat." #version "." #name "," #name "@" #version);
> +# define COMPAT_VERSION_SAMEPROTO(name, version, prefix) \
> + COMPAT_VERSION (name, version, prefix); \
> __typeof (name) _compat_##prefix##_##name asm ("_compat." #version "." #name);
These macros are a bit hairy and I don't fully understand them.
Hopefully Roland can comment on the change too.
If I read this right then for the new COMPAT_VERSION macro we don't define
a _compat_prefix_name symbol anymore. Why isn't that necessary in
that case? (I don't fully understand what that asm statement is trying
to accomplish to be honest.)
I think it is slightly cleaner to keep the old name do the same
thing. So have a COMPAT_VERSION macro that deals with the prototype of
the function being the same. And a new macro COMPAT_VERSION_NEWPROTO
that deals with compat functions that have different prototypes. Then
you don't have to change any existing code.