Wed Nov 25 14:54:46 1998 Zack Weinberg <zack@rabi.phys.columbia.edu>

Wed Nov 25 14:54:46 1998  Zack Weinberg  <zack@rabi.phys.columbia.edu>
        * cpplib.h: Delete struct import_file.  Add ihash element to
        struct cpp_buffer.  Delete dont_repeat_files and
        import_hash_table elements from cpp_reader; change
        all_include_files to a hash table.  Delete all foobar_include
        / last_foobar_include elements from struct cpp_options; put
        back four such: quote_include, bracket_include,
        system_include, after_include.  Redo struct file_name_list
        completely.  Add new structure type include_hash.  Add
        prototypes for merge_include_chains and include_hash.  Change
        prototypes for finclude, find_include_file, and
        append_include_chain to match changes below.
        * cppfiles.c (simplify_pathname, include_hash,
        remap_filename, merge_include_chains): New functions.
        (add_import, lookup_import, open_include_file): Removed.
        (INO_T_EQ): Define this (copied from cccp.c).
        (hack_vms_include_specification): Remove all calls and #if 0
        out the definition.  It was being called incorrectly and at
        the wrong times.  Until a VMSie can look at this, it's better
        to not pretend to support it.
        (append_include_chain): Change calling convention; now takes
        only one directory at a time, and sets up the data structure
        itself.
        (redundant_include_p): Rewritten - this is now used for all
        include redundancy, whether by #ifndef, #import, or #pragma
        once.  Looks up things in the include hash table.
        (file_cleanup): Decrement pfile->system_include_depth here if
        it's >0.
        (find_include_file): Calling convention changed; now passes
        around a struct include_hash instead of 3 separate parameters.
        Guts ripped out and replaced with new include_hash mechanism.
        (finclude): Calling convention changed as for
        find_include_file.  Error exits pulled out-of-line.  Reformat.
        (safe_read): Return a long, not an int.
        (deps_output): Don't recurse.
        * cpplib.c (is_system_include): Deleted.
        (path_include): Fix up call to append_include_chain.
        (do_include): Fix up calls to find_include_file and finclude.
        Clean up dependency output a bit.  Shorten obnoxiously lengthy
        #import warning message.  Don't decrement
        pfile->system_include_depth here.
        (do_pragma): Understand the include_hash structure.  Reformat.
        (do_endif): Correct handling of control macros.  Understand
        the include_hash.
        (cpp_start_read): Fix up calls to finclude.  Call
        merge_include_chains.
        (cpp_handle_option): Fix up calls to append_include_chain.
        Understand the four partial include chains.
        (cpp_finish): Add debugging code (#if 0-ed out) for the
        include_hash.
        (cpp_cleanup): Free the include_hash, not the import hash and
        the all_include and dont_repeat lists which no longer exist.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@23857 138bc75d-0d04-0410-961f-82ee72b054a4