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Re: Weak symbols vs. ptr-to-function: invalid optimisation or undefined behaviour?

From: Paolo Bonzini <bonzini at gnu dot org>
To: Dave Korn <dave dot korn at artimi dot com>
Cc: gcc at gcc dot gnu dot org
Date: Tue, 27 May 2008 16:35:51 +0200
Subject: Re: Weak symbols vs. ptr-to-function: invalid optimisation or undefined behaviour?
References: <03ac01c8bff3$06582fe0$2708a8c0@CAM.ARTIMI.COM>

  if (!register_frame_fn)
    register_frame_fn = __register_frame_info;

Yes, here __register_frame_info is assumed to be non-zero *for non-weak functions*, see tree_single_nonzero_warnv_p. I don't know why your __register_frame_info is not seen as weak.

Paolo

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- Weak symbols vs. ptr-to-function: invalid optimisation or undefined behaviour?
  - From: Dave Korn

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