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- This directory contains the source files for the C component of XEmacs.
- Nothing in this directory is needed for using XEmacs once it is built
- and installed, if the dumped Emacs (on Unix systems) or the XEmacs
- executable and map files (on VMS systems) are copied elsewhere.
-
- See the files ../README and then ../INSTALL for installation instructions.
-
- Under Unix, the file `Makefile.in.in' is used as a template by the script
- `../configure' to produce `Makefile.in'. The same script then uses `cpp'
- to produce the machine-dependent `Makefile' from `Makefile.in';
- `Makefile' is the file which actually controls the compilation of
- Emacs. Most of this should work transparently to the user; you should
- only need to run `../configure', and then type `make'.
-
- See the file VMSBUILD in this directory for instructions on compiling,
- linking and building Emacs on VMS.
-
- The files `*.com' and `temacs.opt' are used on VMS only.
- The files `vlimit.h', `ioclt.h' and `param.h' are stubs to
- allow compilation on VMS with the minimum amount of #ifdefs.
-
- `uaf.h' contains VMS uaf structure definitions. This is only needed if
- you define READ_SYSUAF. This should only be done for single-user
- systems where you are not overly concerned with security, since it
- either requires that you install Emacs with SYSPRV or make SYSUAF.DAT
- world readable. Otherwise, Emacs can determine information about the
- current user, but no one else.
-
- `pwd.h' contains definitions for VMS to be able to correctly simulate
- `getpwdnam' and `getpwduid'.
-
- General changes for XEmacs:
- ---------------------------
- 1. Lisp objects.
-
- -- XFASTINT has been eliminated. Use of this expression as an lvalue
- is incompatible with the union form of Lisp objects, and use as
- an rvalue is likely to lead to errors and doesn't really save much
- time. Expressions of the form `XFASTINT (obj) = num;' get replaced
- by `obj = make_number (num);' or `XSETINT (obj, num);' and
- expressions of the form `num = XFASTINT (obj);' get replaced by
- `num = XINT (obj);'. Use Qzero in place of `make_number (0)'.
-
- -- Use of XTYPE gets replaced by the appropriate predicate. Using
- XTYPE only works for the small number of types that are not stored
- using the Lisp_Record type (int, cons, string, and vector). For
- example, `(XTYPE (foo) == Lisp_Buffer)' gets replaced by
- `(BUFFERP (foo))'.
-
- -- `XSET (obj, Lisp_Int, num)' gets replaced by `XSETINT (obj, num)',
- for consistency.
-
- -- Some occurrences of XSET need to get replaced by XSETR --
- specifically, those where the type is not a primitive type
- (primitive types are int, cons, string, and vector).
-
- -- References to `XSTRING (obj)->size' get replaced with
- `string_length (obj)'. This is currently for cosmetic reasons
- but there may be other reasons in the future. (This change is
- currently incomplete in the source files.)
-
-
- 2. Storage classes:
-
- -- All occurrences of `const' should get replaced by CONST. This
- is to work around a header conflict with X11R4.
-
- -- All occurrences of `register' should be replaced by `REGISTER'.
- It interferes with backtraces so we disable it if DEBUG_XEMACS
- is defined.
-
-
- 3. Errors, messages, I18N3 snarfing:
-
- -- Errors are continuable in XEmacs but are not in FSF Emacs.
- Therefore, it's important that functions do something reasonable
- if an error gets continued. If you want to signal a non-
- continuable error, the call to Fsignal() gets put inside a
- `while (1)' loop. To facilitate this, and also for proper
- I18N3 message snarfing, most calls to Fsignal() have been
- replaced by calls to signal_error(), signal_simple_error(),
- etc.
-
- -- Constant strings occurring in source files need to get wrapped
- in a call to GETTEXT (or if inside of a call to `build_string',
- change that function to `build_translated_string') if they don't
- occur in certain places where the I18N3 message snarfer will see
- them. For a complete discussion of this, see the file
- lib-src/make-msgfile.l.
-
- -- Calls to `fprintf (stderr, ...)' and `printf (...)' get replaced
- with calls to `stderr_out' and `stdout_out'. This is for I18N3
- message snarfing.
-
- 4. Initialization:
-
- -- FSF constructs like `obj = intern ("string"); staticpro (&obj);'
- get replaced by `defsymbol (&obj);'. This is for code cleanness
- and better purespace usage.
- -- FSF constructs like
- obj = intern ("error");
- Fput (obj, Qerror_message, "message");
- Fput (obj, Qerror_conditions, some list);
- get replaced by calls to deferror(). See the definition of
- deferror() for how the correct arguments to pass. This is for
- code cleanness and I18N3 message snarfing.
- -- Code in keys_of_foo() functions has been moved into Lisp.
-