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Re: [RFC][PATCH] Prototype for extended printf hooks

On Fri, 2008-08-22 at 16:45 -0500, Ryan S. Arnold wrote:
> Jakub, libc-help, et al.
> The linked patch (a GLIBC bugzilla attachment) is a prototype patch
> which adds fully featured printf hooks to GLIBC to support the C-spec
> Draft extension data types: DFP, Altivec/VMX, and VSX.

Ulrich, Jakub, et al.

Here's the third draft of the printf override hooks patch I've been
working on:

Associated with bugzilla 6846:

This patch does the following:

- Removes the debugging messages.
- Adds __builtin_expect to branch predict around the new hooks.
- Conditionally initializes the arginfo array only if there's a user of
the overrides.

There still remain several issues:

- Adding fields to structs is probably not a good idea without
versioning interfaces.

- The old interfaces either need to be versioned or there need to be
entirely new interfaces for registering overrides.

I figured I'd worked on those once I got some direction on the plumbing
of the patch.

Ryan S. Arnold
IBM Linux Technology Center
Linux Toolchain Development

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