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bug#7908: png-1.5 fix for emacs-23.2 and HEAD


From: Eli Zaretskii
Subject: bug#7908: png-1.5 fix for emacs-23.2 and HEAD
Date: Sat, 29 Jan 2011 22:46:02 +0200

> From: Chong Yidong <address@hidden>
> Cc: address@hidden, address@hidden
> Date: Sat, 29 Jan 2011 15:33:00 -0500
> 
> Eli Zaretskii <address@hidden> writes:
> 
> > Does this alternate definition of PNG_JMPBUF make sense?
> >
> > #define PNG_JMPBUF(ptr) \
> >   (*(jmp_buf *)(fn_png_set_longjmp_fn((ptr), longjmp, sizeof (jmp_buf))))
> 
> Aha, I think it makes sense.  Since DEF_IMGLIB_FN defines a return type
> of int, whereas fn_png_set_longjmp_fn actually returns a (jmp_buf *), we
> do indeed need to perform the extra cast.  Well spotted.  Does Emacs
> compile properly with this change?

Yes, it does.





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