Re: [png-mng-implement] [libpng:bugs] #216 Alignment problems with 64bit builds of libpng

[John B. <joh...@gm...>]

On Wed, Sep 11, 2013 at 5:55 PM, Glenn Randers-Pehrson <gl...@gm...>wrote:

> OK, so jmp_buf requires 16-bit alignment on some implementation (Windows?)
> that
> also has an implementation of malloc() that does not align properly.
>

No.  That would be a very serious bug in the compiler.

The alignment requirement of jmp_buf is *always* correct, and the hosted
implementation of malloc() *always* returns a pointer that is aligned to
the most stringent alignment requirement of the implementation.  Typically
this matches that of jmp_buf because jmp_buf is (typically) just an array
of machine registers stored to memory and the load/store of machine
registers is what determines the alignment requirement of C structs.

There is no issue; GhostScript has, once again, done something that only
works on x86 and the implementers are suffering for it.  We should not be
joining the suffering.

John Bowler