ARM EABI wchar_t markings

[Paul Brook]

The attached patch ensures that ARM EABI objects are marked with the correct 
wchar_t size attributes.  The problem is that WCHAR_TYPE_SIZE only specifies 
the default size, and may be overridden with -fshort-wchar. It's necessary to 
poke at the frontend types to find the correct size.

The C specific bits of the backend are initialized by REGISTER_TARGET_PRAGMAS. 
This is a hack, but one already used by other targets.

Tested on arm-non-eabi.
I will apply to SVN head once we're out of lockdown.

Paul

2007-06-20  Paul Brook  <paul@codesourcery.com>

	gcc/
	* config.gcc (arm*-*-*): Set c_target_objs and cxx_target_objs.
	* config/arm/arm.c (arm_lang_output_object_attributes_hook): New.
	(arm_file_start): Don't set Tag_ABI_PCS_wchar_t.  Call
	arm_lang_output_object_attributes_hook.
	* config/arm/arm.h (arm_lang_output_object_attributes_hook): Declare.
	(REGISTER_TARGET_PRAGMAS): Call arm_lang_object_attributes_init.
	* config/arm/arm-protos.h (arm_lang_object_attributes_init): Add
	prototype.
	* config/arm/t-arm.c (arm.o): New rule.
	* config/arm/arm-c.c: New file.
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