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

[Andreas Schwab]

Chong Yidong <cyd@stupidchicken.com> writes:

> Eli Zaretskii <eliz@gnu.org> 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.

You can't expect this to work, though.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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