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* Makefile.in (PREPROCESSOR_DEFINES): Add @TARGET_SYSTEM_ROOT_DEFINE@. * configure.in (PREFIX_INCLUDE_DIR): Don't define if $with_sysroot is specified or if building a cross compiler. (TARGET_SYSTEM_ROOT_DEFINE): Add TARGET_SYSTEM_ROOT_RELOCATABLE if the sysroot is under $exec_prefix. * configure: Regenerated. * cppdefault.h: Use native include paths if TARGET_SYSTEM_ROOT is defined. (struct default_include): Add add_sysroot field. (cpp_SYSROOT): Declare. * cppdefault.c (cpp_include_defaults): Fill in add_sysroot field. (cpp_SYSROOT): New variable. * cppinit.c (cpp_create_reader): Initialize CPP_OPTION (pfile, sysroot). (init_standard_includes): Handle add_sysroot. Do not add unrelocated copies of relocated directories. (COMMAND_LINE_OPTIONS): Add -isysroot. (cpp_handle_option): Handle -isysroot. * cpplib.h (struct cpp_options): Add sysroot member. * gcc.c (The Specs Language): Update description of %I. (target_system_root_changed): New variable. (process_command): Conditionalize make_relative_prefix call on !VMS and TARGET_SYSTEM_ROOT_RELOCATABLE. Set target_system_root_changed. (do_spec_1): Add -isysroot to %I. * doc/invoke.texi (Spec Files): Update description of %I. * doc/install.texi (--with-sysroot): Update comment about relocation. From-SVN: r62853
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