cppdefault.c: Define cpp_PREFIX, cpp_PREFIX_len, and gcc_exec_prefix.

cppdefault.c: Define cpp_PREFIX, cpp_PREFIX_len, and gcc_exec_prefix.

gcc/

2006-11-20  Carlos O'Donell  <carlos@codesourcery.com>
	    Mark Mitchell  <mark@codesourcery.com>

	* cppdefault.c: Define cpp_PREFIX, cpp_PREFIX_len, and
	gcc_exec_prefix.
	(cpp_relocated): New function.
	* cppdefault.h: Declare cpp_PREFIX, cpp_PREFIX_len, gcc_exec_prefix
	and cpp_relocated.
	* Makefile.in (PREPROCESSOR_DEFINES): Add -DPREFIX option.
	* c-incpath.c (add_standard_paths): Call cpp_relocated. If relocated,
	replace configured prefix with gcc_exec_prefix.

Co-Authored-By: Mark Mitchell <mark@codesourcery.com>
From-SVN: r119017