Initial import

git-svn-id: http://moon:8086/svn/software/trunk/libsrc/libtiff_2007@1 b431acfa-c32f-4a4a-93f1-934dc6c82436
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+Building the Software on an Acorn RISC OS system
+
+The directory contrib/acorn contains support for compiling the library under
+Acorn C/C++ under Acorn's RISC OS 3.10 or above. Subsequent pathnames will
+use the Acorn format: The full-stop or period character is a pathname
+delimeter, and the slash character is not interpreted; the reverse position
+from Unix. Thus "libtiff/tif_acorn.c" becomes "libtiff.tif_acorn/c".
+
+This support was contributed by Peter Greenham.
+(peterg@angmulti.demon.co.uk).
+
+Installing LibTIFF:
+
+LIBTIFF uses several files which have names longer than the normal RISC OS
+maximum of ten characters. This complicates matters. Maybe one day Acorn will
+address the problem and implement long filenames properly. Until then this
+gets messy, especially as I'm trying to do this with obeyfiles and not have
+to include binaries in this distribution.
+
+First of all, ensure you have Truncate configured on (type *Configure
+Truncate On) Although it is, of course, preferable to have long filenames,
+LIBTIFF can be installed with short filenames, and it will compile and link
+without problems. However, getting it there is more problematic.
+contrib.acorn.install is an installation obeyfile which will create a normal
+Acorn-style library from the source (ie: with c, h and o folders etc.), but
+needs the distribution library to have been unpacked into a location which is
+capable of supporting long filenames, even if only temporarily.
+
+My recommendation, until Acorn address this problem properly, is to use Jason
+Tribbeck's LongFilenames , or any other working system that gives you long
+filenames, like a nearby NFS server for instance.
+
+If you are using Longfilenames, even if only temporarily to install LIBTIFF,
+unpack the TAR into a RAMDisc which has been longfilenamed (ie: *addlongfs
+ram) and then install from there to the hard disk. Unfortunately
+Longfilenames seems a bit unhappy about copying a bunch of long-named files
+across the same filing system, but is happy going between systems. You'll
+need to create a ramdisk of about 2Mb.
+
+Now you can run the installation script I've supplied (in contrib.acorn),
+which will automate the process of installing LIBTIFF as an Acorn-style
+library. The syntax is as follows:
+
+install <source_dir> <dest_dir>
+
+Install will then create <dest_dir> and put the library in there. For
+example, having used LongFilenames on the RAMDisk and unpacked the library
+into there, you can then type:
+
+Obey RAM::RamDisc0.$.contrib.acorn.install RAM::RamDisc0.$ ADFS::4.$.LIBTIFF
+
+It doesn't matter if the destination location can cope with long filenames or
+not. The filenames will be truncated if necessary (*Configure Truncate On if
+you get errors) and all will be well.
+
+Compiling LibTIFF:
+
+Once the LibTIFF folder has been created and the files put inside, making the
+library should be just a matter of running 'SetVars' to set the appropriate
+system variables, then running 'Makefile'.
+
+OSLib
+
+OSLib is a comprehensive API for RISC OS machines, written by Jonathan
+Coxhead of Acorn Computers (although OSLib is not an official Acorn product).
+Using the OSLib SWI veneers produces code which is more compact and more
+efficient than code written using _kernel_swi or _swi. The Acorn port of
+LibTIFF can take advantage of this if present. Edit the Makefile and go to
+the Static dependencies section. The first entry is:
+
+# Static dependencies:
+@.o.tif_acorn:   @.c.tif_acorn
+        cc $(ccflags) -o @.o.tif_acorn @.c.tif_acorn  
+Change the cc line to:
+
+        cc $(ccflags) -DINCLUDE_OSLIB -o @.o.tif_acorn @.c.tif_acorn  
+
+Remember, however, that OSLib is only recommended for efficiency's sake. It
+is not required.