hppa-linux support

[Alan Modra <alan at linuxcare dot com dot au>]

Is it too late to get this merged for gcc-3.0 ?

The bulk of the changes involve splitting up include files like so

	* config/pa/pa-64.h: Delete.  Split into..
	* config/pa/pa64.h: .. architecture defines, and
	* config/pa/pa64-hpux.h: .. operating system defines.  Fix
	ASM_FILE_START.
	(PREFERRED_DEBUGGING_FORMAT): Rename to PREFERRED_DEBUGGING_TYPE.
	* config/pa/pa64-linux.h: New file.
	* config/pa/xm-linux64.h: New file.
	* config/pa/pa-linux.h (LINUX_DEFAULT_ELF): Remove.
	(SELECT_SECTION): Undef.
	(SIZE_TYPE, PTRDIFF_TYPE): Remove.
	(CPP_SPEC): Move to pa32-linux.h
	(LIB_SPEC): Remove -lmilli.
	(ASM_SPEC, LINK_SPEC): Define.
	(FUNCTION_OK_FOR_SIBCALL): Define as zero.
	(SELECT_RTX_SECTION): Define.
	(PREFERRED_DEBUGGING_FORMAT, DWARF2_ASM_LINE_DEBUG_INFO): Define
	(DWARF2_UNWIND_INFO, OBJECT_FORMAT_ELF): Define.
	(INCOMING_RETURN_ADDR_RTX, DWARF_FRAME_RETURN_COLUMN): Define.
	(STRING_ASM_OP, TEXT_SECTION_ASM_OP): Define
	(DATA_SECTION_ASM_OP, BSS_SECTION_ASM_OP): Define.
	(ASM_FILE_START, ASM_OUTPUT_DEF): Define.
	(ASM_OUTPUT_ADDR_VEC_ELT, ASM_OUTPUT_ADDR_DIFF_ELT): Define.
	(ASM_OUTPUT_LABEL, ASM_GLOBALIZE_LABEL): Define.
	(ASM_DECLARE_FUNCTION_NAME): Define.
	* config/pa/pa.h (TARGET_ELF32): Define.
	* config/pa/t-linux (CRTSTUFF_T_CFLAGS_S): Define.
	(TARGET_LIBGCC2_CFLAGS): Define.
	(LIB2FUNCS_EXTRA): Define.
	* config.gcc: Add parisc*64*-*-linux*, hppa*64*-*-linux.  Add
	parisc*-*-linux* as an alias for hppa*-*-linux*.  Update
	hppa*-*-linux* and hppa*64*-*-hpux11* config files.

	* config/pa/pa.md (canonicalize_funcptr_for_compare): Don't use
	for TARGET_ELF32.

If you want to take a look at the whole lot

cvs -d :pserver:anonymous@puffin.external.hp.com:/home/cvs/parisc \
  co -r devel gcc/gcc/config/pa

or I can feed you patches in smallish chunks.

Alan Modra
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