SONAME clarification

[Benjamin Lindner]

> 
> In the end, I decided to go with three separate prefixes to go along
> with the three separate types of suffixes we have:
> 
>   LIBPRE     LIBEXT
>   SHLLIBPRE  SHLLIB and SHLLIB_VER
>   SHLBINPRE  SHLBIN and SHLBIN_VER
> 
> and checked in the following changeset:
> 
>   http://hg.savannah.gnu.org/hgweb/octave/rev/f8b3ece45bda
> 
> If this is not the right thing to do for some platform(s), then please
> submit patches relative to the current sources from the Mercurial
> archive.  For example, I'm not sure how SHLEXT and SHLEXT_VER fit into
> this arrangement, and whether there should also be a prefix variable
> corresponding to those variables.
> 

May I suggest that we please use *separate* case statements for separate 
build archictectures, if the overlap is not significant.

Truly, cygwin and mingw now show to be different enough to justify 
separate treatment. Aside from completely different naming conventions, 
in the mingw case I also need additional flags, since mkoctfile and 
octave-config are compiled executables and not shell scripts - which is 
*not* the case for cygwin.

Keeping mingw and cygwin separate here, changes due to architecture 
affect only the architecture in question - keep it independent, this 
makes maintaining much easier for both cygwin and mingw

I see an immediate bug now, as the
   library_path_var=PATH
statement is missing for the mingw case (I guess cygwin will also need this)

Also I miss the three statements
     CPICFLAG=
     CXXPICFLAG=
     FPICFLAG=
for mingw target (code compiled with mingw in inherently PI, so it is 
not required to add -fPIC, as the resulting gcc warning tells).

Also I don't understand the meaning of SHLBIN. What is it supposed to 
mean? A search through the source code shows no targets containing 
SHLBIN? A short comment in configure.in would I guess be very helpful 
for those who are not familiar with all the makefile conventions in full 
depth.

Sorry for making such a noise here, but this changeset gives me a bit of 
a headache tracking down what has changed for mingw platform, because of 
modifications orinigally intended for the cygwin platform...

I am perfectly willing to provide changesets here, but I feel I do no 
longer understand the code...

benjamin