[PATCH] gnu: Add sg3_utils.

[Chris Marusich]

Hi,

This patch adds sg3_utils (and libsgutils).

When I ran 'guix size sg3_utils', I noticed the following output, which
seemed large to me.  Is it normal?

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix size sg3_utils
store item                                                       total    self
/gnu/store/vbs91pmyw56m7sf8h7qvn465cbwbi24g-sg3_utils-1.42          74.9     
2.4   3.2%
/gnu/store/9nifwk709wajpyfwa0jzaa3p6mf10vxs-gcc-4.9.3-lib           60.9    
22.9  30.5%
/gnu/store/ykzwykkvr2c80rw4l1qh3mvfdkl7jibi-bash-4.3.42             49.7     
4.7   6.3%
/gnu/store/68rzhy9px1njppv0nmbm8nk0sdkg5jx6-readline-6.3            45.0     
1.2   1.6%
/gnu/store/ld16jy012l3jpkj6azynzmldxn28cspw-ncurses-6.0             43.8     
5.7   7.6%
/gnu/store/m9vxvhdj691bq1f85lpflvnhcvrdilih-glibc-2.23              38.1    
36.7  49.0%
/gnu/store/0010wvgs40kdq8chzsh403qm7la9jxq7-bash-static-4.3.42       1.4     
1.4   1.9%
total: 74.9 MiB
--8<---------------cut here---------------end--------------->8---

It might be nice to package the library and the tools separately.  How
might I do that?  The release tarball's README says the following, but I
see no obvious way to split the build output into 3 separate packages:

"Various distributions (of Linux mainly) distribute sg3_utils as 3
installable packages. One is a package containing the shared library
discussed above (e.g. libsgutils2-2_1.33-0.1_i386.deb). A second package
contains the utilities (e.g. sg3-utils_1.33-0.1_i386.deb) and depends on
the first package). Finally there is an optional package that contains
header files and a static library
(e.g. libsgutils2-dev_1.33-0.1_i386.deb). This final package is only
needed to build other packages (e.g. sdparm) that wish to use the
sg3_utils shared library."

-- 
Chris

0001-gnu-Add-sg3_utils.patch
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