Patch: GCCSDK autobuilder support for oslib

[John Tytgat]

Please find attached a patch which facilitates GCCSDK autobuilder support
for oslib.  I would like to add oslib and a couple of other libraries
depending in oslib, like rufl, in GCCSDK autobuilder as soon this patch is
applied.

The changes summerized:
	* CROSSPATH: is replaced by GCCSDK_INSTALL_CROSSBIN (which just got
	commited in GCCSDK CVS tree).  This allows cross-compilation when
	the cross compile is installed at another place than
	/home/riscos/cross/bin.
	* install OSLib32.o and OSLib headers in GCCSDK_INSTALL_ENV (also
	an environment variable just added in GCCSDK CVS tree).
	* OSLibSupport: cleaner signal usage and host compiler support.
	* MacOS X build problems fixed (cp -u option, sed & newline/tab)

The changes in more detail:
	* !OsLib/!Readme: the default location /home/riscos is no longer
	assumed.
	* !OsLib/GNUmakefile (CROSSPATH): replaced by GCCSDK_INSTALL_CROSSBIN
	(CP): no longer using -u option as it is not supported by MacOS X
	Added install rule which copies OSLib32.o and OSLib headers to
	GCCSDK_INSTALL_ENV.
	* !OsLib/Source/GNUmakefile: Likewise.
	* !OsLib/Source/GNUmakefile.source: Likewise.
	* !OsLib/Source/Test/Test1/GNUmakefile: Likewise.
	* !OsLib/Source/Test/TestFW/GNUmakefile: Likewise.
	* !OsLib/Source/Test/readvarval/GNUmakefile: Likewise.
	* !OsLib/examples/GNUmakefile: Likewise.
	* !OsLib/Source/Test/Test/GNUmakefile: Likewise.  Workaround for
	BSD sed and newline/tab characters (MacOS X).
	* !OsLib/GNUmakefile.settings: new file, defines
	GCCSDK_INSTALL_CROSSBIN to the default /home/riscos/cross/bin
	directory if not defined by GCCSDK itself.
	* !OsLib/Source/GNUmakefile.settings: new file, checks existence
	of SOURCEDIR variable and defines BINDIR relatively to that.
	* !OsLib/OSLibSupport/*: more rational signal definition when
	cross-compiling.  Typical RISC OS signals like SIGOSERROR do not
	make sense on native host compilers.
	* !OsLib/Tools/support/*: Likewise.
	* !OsLib/Tools/GNUmakefile.source: use explicitly the host compiler
	as otherwise in GCCSDK autobuilder 'gcc' means the cross-compiler.
	* !OsLib/Tools/DefMod2/defmod/Build_GNU/GNUmakefile: Likewise.
	* !OsLib/Tools/DefMod2/GNUmakefile: removed useless variable
	definitions.
	* !OsLib/Tools/DefMod2/defmod/sources/cstrong.c: tracef() typo
	resulted in compiler error when TRACE was specified.
	* !OsLib/Tools/DefMod2/defmod/sources/objasm.c: removed the
	"-target SA110" assembler option as it is no longer needed.
	* !OsLib/docs/Unix_Build: updated to reflect some of the changes
	made.

These changes only affect the cross-compile build, not the produced binaries.

Happy New Year,
John.
-- 
John Tytgat, in his comfy chair at home                                 BASS
John.Tytgat at aaug.net                             ARM powered, RISC OS driven
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