cpplib: initialization overhaul

[Dave Brolley]

Sorry to be so long in looking at this. I have a question and a comment.

Question: Does the use of separate lists for -D. -U, etc change the order in
which they are processed? Hopefully not.

Comment: I think you need to be more specific in the ChangeLog when you say
"fix memory leaks and streamline code". Which functions did you fix leaks in?
Which functions and/or declarations did you move/delete/create when
streamlining the code?

Dave

Zack Weinberg wrote:

> This patch overhauls the initialization code for cpplib.  Several bugs
> are fixed, the important one being that system-header-ness wasn't kept
> track of properly, causing many regressions in the C++ testsuite.  It
> should be faster (the difference isn't significant) and it shouldn't
> leak memory anymore.
>
> Note to the warnings police:  If a function is documented to modify
> its string argument in place, don't change it to make a copy and
> modify that.
>
> Tested to bootstrap successfully on x86, no additional regressions.
> With a patch for the testsuite (see other post), it fixes many
> regressions in g++.old-deja.
>
> zw
>
> 1999-02-26 09:18 -0500  Zack Weinberg  <zack@rabi.columbia.edu>
>
>         * cppinit.c: Instead of one pending list, keep separate lists
>         for each category of pending option: -D/-U, -A, -include,
>         -imacros.  Move the four partial include-path lists into the
>         pending block.  Bring over `base_name' function from cccp.c.
>         If opts->verbose, print details on directories dropped from the
>         include path.  Fix several memory leaks and streamline code.
>         (nreverse_pending, push_pending): Removed.
>         (path_include): Can now add to any partial include path.
>         (append_include_chain): Brought over from cppfiles.c.  Mark
>         dirs as system include dirs if and only if appending to
>         system include path.
>         (cpp_options_init): Allocate the pending block.
>         (cpp_start_read): Break out blocks of code to their own
>         functions: install_predefs and initialize_dependency_output.
>         Use path_include for C_INCLUDE_PATH and friends as well as CPATH.
>         (cpp_handle_option): Add --version.  Exit after --help.
>
>         * cppfiles.c (simplify_pathname): Export.
>         (merge_include_chains):  Don't nreverse the lists.  If
>         opts->verbose, print details on dirs dropped from the include
>         path.
>         (finclude): Fix excessive cleverness in setting
>         fp->system_header_p.
>         (actual_directory): Set x->sysp from
>         CPP_BUFFER (pfile)->system_header_p so that one system header
>         may include another with "".
>
>         * cpplib.c (cpp_unassert): New function.
>         * cpplib.h: Lay out struct cpp_pending here.  Adjust
>         prototypes.