Add -iframework

[Mark Mitchell]

Mike Stump wrote:

> 	* c-opts.c (c_common_handle_option): Handle language specific
> 	target options.
> 	* opts.c (handle_option): Verify language for target options, if
> 	any are given.
> 	* opth-gen.awk: Add CL_LANG_ALL.
> 	* config/darwin.opt (iframework): Add.
> 	* config/darwin.h (TARGET_HANDLE_C_OPTION): Add.
> 	* config/darwin-c.c (add_system_framework_path): Export.
> 	(darwin_handle_c_option): Add.
> 	* config/darwin-protos.h (darwin_asm_output_anchor): Add.
> 	* doc/invoke.texi (Darwin Options): Add -iframework.
> 	* doc/tm.texi (TARGET_HANDLE_C_OPTION): Add.

TARGET_HANDLE_C_OPTION should be a target hook, not a new target macro; 
we're trying to eliminate target macros.

Fundamentally, though, this versionstill doesn't live only with Darwin 
configuration files, and -iframework is clearly a new feature; please 
hold on to it for 4.3 stage 1.

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
(650) 331-3385 x713