* Makefile.in (xcpp, cppspec.o): New targets.
        (CPP_INSTALL_NAME): New macro.
        (install-cpp): Install xcpp.  Use CPP_INSTALL_NAME.
        (all.build, start.encap): Build xcpp.
        * cppspec.c: New file, implements argument filtering for a
        user-visible C preprocessor.
        * cpp.sh: Removed.

From-SVN: r26007