[csl-arm] Unwinding table defaults

[Paul Brook]

Currently gcc enables generation unwind tables by default for targets that 
define TARGET_UNWIND_INFO. This effects two targets: ia64 and arm-eabi. The 
latter only requires unwinding tables for C++ exceptions, it does not require 
them for C code.

The attached patch separates the default for flag_unwind_tables from 
TARGET_UNWIND_INFO.

Tested with cross to arm-none-elf, and light testing on ia64-hpux.
Applied to csl-arm-branch.

Paul

2005-01-28  Paul Brook  <paul@codesourcery.com>

 * Makefile.in (opts.o): Depend on $(TARGET_H).
 * opts.c: Include target.h.
 (decode_options): Use targetm.unwind_tables_default.
 * target-def.h (TARGET_UNWIND_TABLES_DEFAULT): Define.
 (TARGET_INITIALIZER): Use it
 * target.h (struct gcc_target): Add unwind_tables_default.
 * config/ia64/ia64.h (TARGET_UNWIND_TABLES_DEFAULT): Define.
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