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Improve the implementation, documentation of #'labels, #'flet. lisp/ChangeLog addition: 2011-09-07 Aidan Kehoe <kehoea@parhasard.net> * bytecomp.el: * bytecomp.el (for-effect): Move this earlier in the file, it's referenced in byte-compile-initial-macro-environment. * bytecomp.el (byte-compile-initial-macro-environment): In the byte-compile-macro-environment definition for #'labels, put off the compiling the lambda bodies until the point where the rest of the form is being compiled, allowing the lambda bodies to access appropriate values for byte-compile-bound-variables, and reducing excessive warning about free variables. Add a byte-compile-macro-environment definition for #'flet. This modifies byte-compile-function-environment appropriately, and warns about bindings of functions that have macro definitions in the current environment, about functions that have byte codes, and about functions that have byte-compile methods (which may not do what the user wants at runtime). * bytecomp.el (byte-compile-funcall): If FUNCTION is constant, call #'byte-compile-callargs-warn if that's appropriate, giving warnings about problems with calling functions bound with #'labels. * cl-macs.el: * cl-macs.el (flet): Mention the main difference from Common Lisp, that the bindings are dynamic, not lexical. Counsel the use of #'labels, not #'flet, for this and other reasons. Explain the limited single use case for #'flet. Cross-reference to bytecomp.el in a comment. * cl-macs.el (labels): Go into detail on which functions may be called from where. Explain how to access the function definition of a label within FORM. Add a comment cross-referencing to bytecomp.el. man/ChangeLog addition: 2011-09-07 Aidan Kehoe <kehoea@parhasard.net> * cl.texi (Function Bindings): Move #'labels first, describe it in more detail, explaining that it is to be preferred over #'flet, and explaining why. Explain that dynamic bindings with #'flet will also not work when functions are accessed through their bytecodes.
author Aidan Kehoe <kehoea@parhasard.net>
date Wed, 07 Sep 2011 16:26:45 +0100
parents 1f0b15040456
children
line wrap: on
line source

/* Definitions file for XEmacs running on IBM AIX version 4.2
 *    Copyright (C) 1985, 1986, 1990 Free Software Foundation, Inc.
 *    Copyright (C) 2010 Ben Wing.
 *
 *    This file is part of XEmacs.
 *
 *    XEmacs is free software: you can redistribute it and/or modify it
 *    under the terms of the GNU General Public License as published by the
 *    Free Software Foundation, either version 3 of the License, or (at your
 *    option) any later version.
 *    
 *    XEmacs is distributed in the hope that it will be useful, but WITHOUT
 *    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *    for more details.
 *    
 *    You should have received a copy of the GNU General Public License
 *    along with XEmacs.  If not, see <http://www.gnu.org/licenses/>. */

/* Synched up with: FSF 19.31. */

/*
 *	Define symbols to identify the version of Unix this is.
 *	Define all the symbols that apply correctly.
 */

#define USG				/* System III, System V, etc */
#define USG5

/*      Specify IBM AIX version of system */

#ifndef AIX
#define AIX
#define AIX4
#define AIX4_1
#endif

/*      This symbol should be defined on AIX Version 3  ??????? */
#ifndef _AIX
#define _AIX
#endif

/* SYSTEM_TYPE should indicate the kind of system you are using.
 *  It sets the Lisp variable system-type.  */

#define SYSTEM_TYPE "aix"

/* Special itemss needed to make Emacs run on this system.  */

#ifndef __GNUC__
#define LINKER "cc"
#endif

/* Deleted LIBS_DEBUG */

/* No need to specify -lc when linking.  */

#define LIB_STANDARD

/* AIX doesn't define this.  */
#define unix 1

#ifndef __GNUC__
/* Otherwise, XEmacs is just too big ... */
#define C_SWITCH_SYSTEM "-mminimal-toc"
#endif

#define HAVE_ALLOCA

/* FIXME: This was needed for AIX 4.1.  Is it for AIX 4.2? */
/* The character-composition stuff is broken in X11R5.
 * Even with XIMStatusNothing aliased to XIMStatusNone,
 * tranle@intellicorp.com (Minh Tran-Le) reports that enabling
 * the internationalization code causes the modifier keys C, M and Shift
 * to beep after a mouse click.  */
#define X11R5_INHIBIT_I18N

#define MAIL_USE_LOCKF

/* XEmacs: from dkeller@VNET.IBM.COM */
#define BROKEN_SIGIO

#ifndef NOT_C_CODE
#define _XFUNCS_H_ 1

/* #### we don't use either any more.  some AIX user should delete the include
 * and see if anything breaks. --ben */
/* AIX is happier when bzero and strcasecmp are declared */
#include "strings.h"

/* Forward declarations for xlc warning suppressions */
struct ether_addr;
struct sockaddr_dl;

#ifdef __xlC__			/* "eXceLlent C compiler" ?! */
#if __xlC__ >= 1200
/* IBM's C compiler option `-O3' is too aggressive.
 * We recommend instead the combination `-O3 -qstrict', which seems safe.
 *
 * cc -O3 miscompiles at least two functions.  From IBM's docs:
 *
 * IBM> -qstrict turns off the following optimizations:
 *
 * IBM> Performing code motion and scheduling on computations such as loads
 * IBM> and floating-point computations that may trigger an exception.
 *
 * Nevertheless, we try to work with these compiler options. */
#pragma option_override (bytecount_to_charcount, "opt(strict,yes)")
#pragma option_override (Fexpand_file_name, "opt(strict,yes)")
#endif /* recent IBM C compiler */
#endif /* IBM's C compiler */

#endif /* C code */

/* getaddrinfo is broken in AIX 4.3 as per IY04165.
 *    At this time (2/21/2000), there's no PTF available.
 *       -- Mike Sperber <mike@xemacs.org> */

#undef HAVE_GETADDRINFO

#ifdef __GNUC__
#undef _NO_PROTO
#endif

/* XEmacs: C_DEBUG_SWITCH, C_OPTIMIZE_SWITCH no longer used */