RFA: Add support for Renesas RX architecture to GCC (take 2)

[Nick Clifton <nickc@redhat.com>]

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Hi Guys,

  Here is a revised submission of the RX port for GCC.  I have tried
  to resolve all of the issues raised by Joseph and Richard (thanks
  for the reviews!).  Although there is no changelog entry for it,
  this patch does also include an update to the webpages mentioning
  the contribution of support for the new architecture.

  OK to apply ?

Cheers
  Nick

./ChangeLog
2009-10-08  Nick Clifton  <nickc@redhat.com>

	* MAINTAINERS: Add myself as a maintainer for the RX port.

gcc/ChangeLog
2009-10-08  Nick Clifton  <nickc@redhat.com>

	* config.gcc: Add support for RX target.
	* config/rx: New directory.
	* config/rx/constraints.md: New file.
	* config/rx/predicates.md: New file.
	* config/rx/rx.c: New file.
	* config/rx/rx.h: New file.
	* config/rx/rx.md: New file.
	* config/rx/rx.opt: New file.
	* config/rx/rx-protos.h: New file.
	* config/rx/t-rx: New file.
	* doc/extend.texi: Document RX function attributes.
	* doc/invoke.texi: Document RX specific command line options.
	* doc/contrib.texi: Document RX contribution.
	* doc/md.texi: Document RX constraints.
	* doc/install.texi: Document RX support.

libgcc/ChangeLog
2009-10-08  Nick Clifton  <nickc@redhat.com>

	* config.host: Add support for RX target.
	* config/rx: New directory.
	* config/rx/rx-abi-functions.c: New file. Supplementary
	functions for libgcc to support the RX ABI.
	* config/rx/rx-abi.h: New file.  Supplementary header file for
	libgcc RX ABI functions.
	* config/rx/t-rx: New file: Makefile fragment for building
	libgcc for the RX.

gcc/testsuite/ChangeLog
2009-10-08  Nick Clifton  <nickc@redhat.com>

	* lib/target-supports.exp (check_profiling_available):
	Profiling is not, currently, available for the RX port.
	(check_effective_target_hard_float): Add support for RX
	target.
	* gcc.target/rx: New directory.
	* gcc.target/rx/builtins.c: New test file.
	* gcc.target/rx/interrupts.c: New test file.
	* gcc.target/rx/rx-abi-function-tests.c: New test file.
	* gcc.target/rx/zero-width-bitfield.c: New test file.
	* gcc.target/rx/i272091.c: New test file.
	* gcc.target/rx/packed-struct.c: New test file.
	* gcc.target/rx/rx.exp: New file: Drives RX tests.
	

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