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From: Jeff Breidenbach <breidenbach@gmail.com>
Date: Sun, 3 Jan 2021 20:01:27 -0800
Message-ID: <CAHjiUbojWu2BPT7v4-9qo6-3ppxJ4w4g+nD7Gp1rM0JbNmduDw@mail.gmail.com>
To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
Subject: Re: [Tiff] Autotools
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As mentioned, I had a significant data corruption event about 10
years ago.  It was due to an incorrect value for SIZEOF_LONG in
tiffconfig.h (which is generated by configure). I presume this exact
problem will become impossible if libtiff switches to C99, because
presumably libtiff won't be using long any more.

Looking a little more carefully at that tiffconfig.h, there's just a bit
more
platform compatibility stuff in there (HOST_BIGENDIAN, HAVE_IEEEFP,
HOST_FILLORDER). I don't know if C99 can make all those go away
or not.  But if it does, that would be nice. One less opportunity for
mistakes
to happen.

My favorite part of C is the language almost never changes. My favorite
part of libraries like libtiff is their API almost never changing. But I can
understand this change; data corruption mistakes are no joke.

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<div dir=3D"ltr">As mentioned, I=C2=A0had a significant data corruption eve=
nt about 10=C2=A0<div>years ago.=C2=A0 It was due to an incorrect value for=
 SIZEOF_LONG in=C2=A0</div><div>tiffconfig.h (which is generated by configu=
re). I presume this exact=C2=A0</div><div>problem will become impossible if=
 libtiff switches to C99, because=C2=A0</div><div>presumably libtiff won&#3=
9;t be using long any more.</div><div><br></div><div>Looking a little more =
carefully at that tiffconfig.h, there&#39;s just a bit more=C2=A0</div><div=
>platform compatibility stuff in there (HOST_BIGENDIAN, HAVE_IEEEFP,=C2=A0<=
/div><div>HOST_FILLORDER). I don&#39;t know if C99 can make all those go aw=
ay=C2=A0</div><div>or not.=C2=A0 But if it does, that would be nice. One le=
ss opportunity for mistakes</div><div>to happen.</div><div><br></div><div>M=
y favorite part of C is the language almost never changes. My favorite</div=
><div>part of libraries like libtiff is their API almost never changing. Bu=
t I can</div><div>understand this change; data corruption mistakes are no j=
oke.</div><div><br></div><div><br></div><div><br></div><div><br></div><div>=
<br></div><div><div><div><br></div></div></div></div>

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