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<H1>Re: Compiling Sane Now Infuriating</H1>
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<STRONG>From:</STRONG> Douglas Gilbert (<A HREF="mailto:dgilbert@interlog.com?Subject=Re:%20Compiling%20Sane%20Now%20Infuriating&In-Reply-To=&lt;3A5F4B44.785C4F4@interlog.com&gt;"><EM>dgilbert@interlog.com</EM></A>)<BR>
<STRONG>Date:</STRONG> Fri Jan 12 2001 - 10:21:56 PST
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&quot;Jeffrey W. Baker&quot; wrote:
<BR>
<EM>&gt;
</EM><BR>
<EM>&gt; Hi,
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; Is it actually possible to compile sane? I downloaded both parts of the
</EM><BR>
<EM>&gt; 1.0.4 package. I tried to build the backends, but sanei_scsi.c has some
</EM><BR>
<EM>&gt; preprocessor horkage by which it includes /usr/include/scsi/sg.h and
</EM><BR>
<EM>&gt; /usr/include/linux/../scsi/sg.h,
</EM><BR>
<P>Hmmm. Including both of those files is asking for
<BR>
trouble. Even though I included a C++ type guard
<BR>
inside sg.h , the GNU library maintainers changed
<BR>
it in their version! Even then, the &quot;guard&quot; solution
<BR>
is less than desirable because it just picks
<BR>
the first header seen.
<BR>
<P><EM>&gt; which are clearly the same file and gcc
</EM><BR>
<EM>&gt; gets pissed off by redefinition. After I fixed this problem (not the
</EM><BR>
<EM>&gt; right way, I'm sure, but by hard-coding #include &lt;scsi/sg.h&gt;), the package
</EM><BR>
<EM>&gt; compiled and installed.
</EM><BR>
<P>It may have compiled and worked, but it defeated
<BR>
what sanei_scsi was trying to do.
<BR>
<P>sg.h is collateral damage in a minor GNU-linux turf
<BR>
war. The file /usr/src/linux/include/scsi/sg.h is the
<BR>
header that matches the the sg driver in the kernel
<BR>
(unless the kernel source and the running kernel are
<BR>
out of sync). The file /usr/include/scsi/sg.h &quot;belongs&quot;
<BR>
to the GNU library and may or may not match the running
<BR>
sg driver. Surprisingly the glibc 2.2 library (update to
<BR>
RH 7.0) does have the latest sg.h (correct for lk 2.4.0),
<BR>
albeit reformatted and with a different guard. Perhaps
<BR>
I should change the kernel guard to be the same as the
<BR>
GNU guard ...
<BR>
<P>It seems bizarre to me that if the sg.h lived in the
<BR>
&quot;linux&quot; directory rather than the &quot;scsi&quot; directory,
<BR>
this problem wouldn't happen (since the former directory
<BR>
is a symlink to /usr/src/linux/include/linux). There
<BR>
seems little I can do about this other than try and
<BR>
explain what is happening. The GNU library maintainers
<BR>
have another spin on this, quoting Linus Torvalds
<BR>
amongst others that apps should never directly access
<BR>
kernel headers.
<BR>
<P>Thanks for letting me share your infuriation ;-)
<BR>
<P>BTW SANE 1.0.4 built &quot;out of the box&quot; for me.
<BR>
<P>Doug Gilbert
<BR>
<P><P><PRE>
--
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