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annotate src/compiler.h @ 2500:3d8143fc88e1

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[xemacs-hg @ 2005-01-24 23:33:30 by ben] get working with VC7 config.inc.samp: Declare OPTIONAL_LIBRARY_DIR as root of library directories. Redo all graphics library defaults to mirror the versions and directories in the current binary aux distribution on xemacs web site. Enable TIFF and COMPFACE by default since you can now compile with them and binary libs are provided. xemacs.mak: Put our own directories first in case of conflict (e.g. config.h in compface). xemacs.mak: Use MSVCRT to avoid link problems. s/windowsnt.h: bytecode.c, print.c: Add casts to avoid warning. compiler.h: Add MSC_VERSION and include definitions of DOESNT_RETURN and friends here, like for GCC. Need different definitions for VC7 and VC6. s/windowsnt.h: Remove stuff moved to compiler.h. Disable warning 4646 ("function declared with __declspec(noreturn) has non-void return type") on VC7 since lots of Lisp primitives trigger this and there is no easy way to kludge around the warning. glyphs-eimage.c: Some really nasty hacks to allow TIFF and JPEG to both be compiled. #### The better solution is to move the TIFF and JPEG code to different files. glyphs-msw.c: Define __STDC__ to avoid problems with compface.h. intl-auto-encap-win32.c, intl-auto-encap-win32.h, intl-encap-win32.c, syswindows.h: Those wankers at Microsoft cannot leave well enough alone. Various functions change parameter types semi-randomly between VC6 and VC7, so we need to include our own versions that can handle both kinds with appropriate casting. EmacsFrame.c, EmacsShell-sub.c, EmacsShell.c, alloc.c, alloca.c, buffer.c, bytecode.c, charset.h, chartab.c, cm.c, console-stream.c, console.c, data.c, debug.h, device-msw.c, device-tty.c, device-x.c, doprnt.c, dumper.c, dynarr.c, elhash.c, emacs.c, eval.c, event-Xt.c, event-gtk.c, event-msw.c, event-stream.c, events.c, extents.c, faces.c, file-coding.c, fileio.c, fns.c, font-lock.c, frame-gtk.c, frame-x.c, frame.c, free-hook.c, gccache-gtk.c, glyphs-eimage.c, glyphs-gtk.c, glyphs-msw.c, glyphs-x.c, glyphs.c, gtk-glue.c, gutter.c, input-method-xlib.c, insdel.c, intl-win32.c, keymap.c, lisp.h, lread.c, lstream.c, macros.c, malloc.c, menubar-gtk.c, menubar-msw.c, menubar-x.c, mule-coding.c, native-gtk-toolbar.c, number.c, objects-msw.c, objects.c, print.c, process-nt.c, process-unix.c, process.c, ralloc.c, rangetab.c, redisplay-gtk.c, redisplay-msw.c, redisplay-output.c, redisplay-tty.c, redisplay-x.c, redisplay.c, regex.c, scrollbar-gtk.c, scrollbar-x.c, search.c, select-x.c, signal.c, specifier.c, specifier.h, strftime.c, sunplay.c, symbols.c, sysdep.c, sysproc.h, text.c, text.h, toolbar-common.c, toolbar-msw.c, toolbar.c, ui-gtk.c, unexnt.c, unicode.c, win32.c, window.c, xgccache.c, s/windowsnt.h: abort() -> ABORT(). Eliminate preprocessor games with abort() since it creates huge problems in VC7, solvable only by including massive amounts of files in every compile (and not worth it).
author ben
date Mon, 24 Jan 2005 23:34:34 +0000
parents ecf1ebac70d8
children facf3239ba30
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1 /* Compiler-specific definitions for XEmacs.
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2 Copyright (C) 1998-1999, 2003 Free Software Foundation, Inc.
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3 Copyright (C) 1994 Richard Mlynarik.
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4 Copyright (C) 1995, 1996, 2000-2004 Ben Wing.
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: not in FSF. */
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24
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25 /* Authorship:
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26
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27 NOT_REACHED, DOESNT_RETURN, PRINTF_ARGS by Richard Mlynarik, c. 1994.
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28 RETURN_SANS_WARNING by Martin buchholz, 1998 or 1999.
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29 Many changes and improvements by Jerry James, 2003.
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30 Split out of lisp.h, reorganized, and modernized.
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31 {BEGIN,END}_C_DECLS, NEED_GCC, GCC_VERSION
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32 ATTRIBUTE_MALLOC, ATTRIBUTE_CONST, ATTRIBUTE_PURE, UNUSED
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33 */
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34
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35 #ifndef INCLUDED_compiler_h
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36 #define INCLUDED_compiler_h
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37
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38 /* Define min() and max(). (Some compilers put them in strange places that
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39 won't be referenced by include files used by XEmacs, such as 'macros.h'
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40 under Solaris.) */
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41
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42 #ifndef min
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43 # define min(a,b) (((a) <= (b)) ? (a) : (b))
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44 #endif
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45 #ifndef max
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46 # define max(a,b) (((a) > (b)) ? (a) : (b))
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47 #endif
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48
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49 /* Regular C complains about possible clobbering of local vars NOT declared
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50 as volatile if there's a longjmp() in a function. C++ complains if such
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51 vars ARE volatile; or more correctly, sans volatile no problem even when
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52 you longjmp, avec volatile you get unfixable compile errors like
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53
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54 /src/xemacs/lilfix/src/process-unix.c: In function `void
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55 unix_send_process(Lisp_Object, lstream*)':
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56 /src/xemacs/lilfix/src/process-unix.c:1577: no matching function for call to `
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57 Lisp_Object::Lisp_Object(volatile Lisp_Object&)'
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58 /src/xemacs/lilfix/src/lisp-union.h:32: candidates are:
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59 Lisp_Object::Lisp_Object(const Lisp_Object&)
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60 */
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61
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62 #ifdef __cplusplus
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63 # define VOLATILE_IF_NOT_CPP
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64 #else
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65 # define VOLATILE_IF_NOT_CPP volatile
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66 #endif
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67
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68 /* Avoid indentation problems when XEmacs sees the curly braces */
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69 #ifndef BEGIN_C_DECLS
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70 # ifdef __cplusplus
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71 # define BEGIN_C_DECLS extern "C" {
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72 # define END_C_DECLS }
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73 # else
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74 # define BEGIN_C_DECLS
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75 # define END_C_DECLS
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76 # endif
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77 #endif
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78
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79 /* Guard against older gccs that did not define all of these symbols */
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80 #ifdef __GNUC__
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81 # ifndef __GNUC_MINOR__
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82 # define __GNUC_MINOR__ 0
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83 # endif
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84 # ifndef __GNUC_PATCHLEVEL__
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85 # define __GNUC_PATCHLEVEL__ 0
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86 # endif
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87 #endif /* __GNUC__ */
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88
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89 /* Simplify testing for specific GCC versions. For non-GNU compilers,
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90 GCC_VERSION evaluates to zero. */
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91 #ifndef NEED_GCC
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92 # define NEED_GCC(major,minor,patch) (major * 1000000 + minor * 1000 + patch)
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93 #endif /* NEED_GCC */
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94 #ifndef GCC_VERSION
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95 # ifdef __GNUC__
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96 # define GCC_VERSION NEED_GCC (__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
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97 # else
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98 # define GCC_VERSION 0
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99 # endif /* __GNUC__ */
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100 #endif /* GCC_VERSION */
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101
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102 #ifdef _MSC_VER
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103 #define MSC_VERSION _MSC_VER
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104 #else
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105 #define MSC_VERSION 0
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106 #endif
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107
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108 /* GCC < 2.6.0 could only declare one attribute per function. In that case,
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109 we define DOESNT_RETURN in preference to PRINTF_ARGS, which is only used
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110 for checking args against the string spec. */
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111 #ifndef PRINTF_ARGS
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112 # if (GCC_VERSION >= NEED_GCC (2, 6, 0))
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113 # define PRINTF_ARGS(string_index,first_to_check) \
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114 __attribute__ ((format (printf, string_index, first_to_check)))
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115 # else
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116 # define PRINTF_ARGS(string_index,first_to_check)
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117 # endif /* GNUC */
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118 #endif
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119
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120 #ifndef DOESNT_RETURN_TYPE
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121 # if (GCC_VERSION > NEED_GCC (0, 0, 0))
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122 # if (GCC_VERSION >= NEED_GCC (2, 5, 0))
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123 # ifndef __INTEL_COMPILER
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124 # define RETURN_NOT_REACHED(value) DO_NOTHING
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125 # endif
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126 # define DOESNT_RETURN_TYPE(rettype) rettype
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127 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype decl \
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128 __attribute__ ((noreturn))
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129 # else /* GCC_VERSION < NEED_GCC (2, 5, 0) */
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130 # define DOESNT_RETURN_TYPE(rettype) rettype volatile
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131 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype volatile decl
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132 # endif /* GCC_VERSION >= NEED_GCC (2, 5, 0) */
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133 # elif (MSC_VERSION >= 1200)
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134 /* MSVC 6.0 has a mechanism to declare functions which never return */
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135 # define DOESNT_RETURN_TYPE(rettype) __declspec(noreturn) rettype
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136 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) \
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137 __declspec(noreturn) rettype XCDECL decl
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138 # if (MSC_VERSION >= 1300)
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139 /* VC++ 7 issues warnings about return statements in __declspec(noreturn)
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140 functions; this problem didn't exist under VC++ 6 */
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141 # define RETURN_NOT_REACHED(value) DO_NOTHING
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142 # endif
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143 # else /* not gcc, VC++ */
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144 # define DOESNT_RETURN_TYPE(rettype) rettype
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145 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype decl
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146 # endif /* GCC_VERSION > NEED_GCC (0, 0, 0) */
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147 #endif /* DOESNT_RETURN_TYPE */
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148 #ifndef DOESNT_RETURN
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149 # define DOESNT_RETURN DOESNT_RETURN_TYPE (void)
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150 # define DECLARE_DOESNT_RETURN(decl) DECLARE_DOESNT_RETURN_TYPE (void, decl)
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151 #endif /* DOESNT_RETURN */
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152
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153 /* Another try to fix SunPro C compiler warnings */
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154 /* "end-of-loop code not reached" */
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155 /* "statement not reached */
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156 #if defined __SUNPRO_C || defined __USLC__
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157 # define RETURN_SANS_WARNINGS if (1) return
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158 # define RETURN_NOT_REACHED(value) DO_NOTHING
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159 #endif
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160
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161 /* More ways to shut up compiler. This works in Fcommand_loop_1(),
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162 where there's an infinite loop in a function returning a Lisp object.
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163 */
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164 #if (defined (_MSC_VER) && MSC_VERSION < 1300) || defined (__SUNPRO_C) || \
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165 defined (__SUNPRO_CC) || (defined (DEC_ALPHA) && defined (OSF1))
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166 # define DO_NOTHING_DISABLING_NO_RETURN_WARNINGS if (0) return Qnil
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167 #else
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168 # define DO_NOTHING_DISABLING_NO_RETURN_WARNINGS DO_NOTHING
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169 #endif
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170
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171 #ifndef RETURN_NOT_REACHED
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172 # define RETURN_NOT_REACHED(value) return (value)
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173 #endif
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174
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175 #ifndef RETURN_SANS_WARNINGS
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176 # define RETURN_SANS_WARNINGS return
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177 #endif
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178
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179 #ifndef DO_NOTHING
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180 # define DO_NOTHING do {} while (0)
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181 #endif
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182
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183 #ifndef DECLARE_NOTHING
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184 # define DECLARE_NOTHING struct nosuchstruct
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185 #endif
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186
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187 #ifndef ATTRIBUTE_MALLOC
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188 # if (GCC_VERSION >= NEED_GCC (2, 96, 0))
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189 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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190 # else
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191 # define ATTRIBUTE_MALLOC
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192 # endif /* GCC_VERSION >= NEED_GCC (2, 96, 0) */
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193 #endif /* ATTRIBUTE_MALLOC */
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194
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195 #ifndef ATTRIBUTE_PURE
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196 # if (GCC_VERSION >= NEED_GCC (2, 96, 0))
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197 # define ATTRIBUTE_PURE __attribute__ ((pure))
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198 # else
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199 # define ATTRIBUTE_PURE
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200 # endif /* GCC_VERSION >= NEED_GCC (2, 96, 0) */
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201 #endif /* ATTRIBUTE_PURE */
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202
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203 #ifndef ATTRIBUTE_CONST
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204 # if (GCC_VERSION >= NEED_GCC (2, 5, 0))
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205 # define ATTRIBUTE_CONST __attribute__ ((const))
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206 # define CONST_FUNC
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207 # else
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208 # define ATTRIBUTE_CONST
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209 # define CONST_FUNC const
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210 # endif /* GCC_VERSION >= NEED_GCC (2, 5, 0) */
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211 #endif /* ATTRIBUTE_CONST */
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212
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213 /* Unused declarations; g++ and icc do not support this. */
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214 #ifndef UNUSED_ARG
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215 # define UNUSED_ARG(decl) unused_##decl
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216 #endif
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217 #ifndef UNUSED
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218 # if defined(__GNUC__) && !defined(__cplusplus) && !defined(__INTEL_COMPILER)
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219 # define ATTRIBUTE_UNUSED __attribute__ ((unused))
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220 # else
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221 # define ATTRIBUTE_UNUSED
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222 # endif
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223 # define UNUSED(decl) UNUSED_ARG (decl) ATTRIBUTE_UNUSED
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224 # ifdef MULE
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225 # define USED_IF_MULE(decl) decl
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226 # else
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227 # define USED_IF_MULE(decl) UNUSED (decl)
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228 # endif
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229 # if defined (MULE) || defined (ERROR_CHECK_TEXT)
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230 # define USED_IF_MULE_OR_CHECK_TEXT(decl) decl
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231 # else
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232 # define USED_IF_MULE_OR_CHECK_TEXT(decl) UNUSED (decl)
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233 # endif
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234 #endif /* UNUSED */
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235
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236 #ifdef DEBUG_XEMACS
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237 # define REGISTER
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238 # define register
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239 #else
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240 # define REGISTER register
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241 #endif
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242
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243 #if defined(HAVE_MS_WINDOWS) && defined(HAVE_SHLIB)
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244 # ifdef EMACS_MODULE
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245 # define MODULE_API __declspec(dllimport)
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246 # else
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247 # define MODULE_API __declspec(dllexport)
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248 # endif
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249 #else
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250 # define MODULE_API
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251 #endif
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252
2367
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253 /* Under "strict-aliasing" assumptions, you're not necessarily allowed to
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254 access the same memory address as two different types. The proper way
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255 around that is with a union. The macros below help out, e.g. the
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256 definition of XE_MAKEPOINTS(val) is
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257
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258 ANSI_ALIASING_TYPEDEF (POINTS, POINTS);
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259 #define XE_MAKEPOINTS(l) ANSI_ALIASING_CAST (POINTS, l)
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260
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261 replacing
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262
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263 BAD!!! #define XE_MAKEPOINTS(l) (* (POINTS *) &(l))
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264
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265 On the other hand, if you are just casting from one pointer to the other
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266 in order to pass a pointer to another function, it's probably OK to just
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267 trick GCC by inserting an intermediate cast to (void *), to avoid
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268 warnings about "dereferencing type-punned pointer". #### I don't know
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269 how kosher this is, but do strict-aliasing rules really apply across
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270 functions?
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271
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272 Note that the input to e.g. VOIDP_CAST must be an lvalue (i.e. not
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273 &(something)), but the value of the macro is also an lvalue, so in place
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274 of `(void **) &foo' you could write `& VOIDP_CAST (foo)' if you are
ecf1ebac70d8 [xemacs-hg @ 2004-11-04 23:05:23 by ben]
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275 subsequently dereferencing the value or don't feel comfortable doing a
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276 trick like `(void **) (void *) &foo'.
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277
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278 Unfortunately, it does not work to just define the union type on the fly in
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279 the cast -- otherwise, we could avoid the need for a typedef. Or rather,
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280 it does work under gcc but not under Visual C++.
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281
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282 --ben
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283 */
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284
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285 #define ANSI_ALIASING_TYPEDEF(name, type) typedef union { char c; type p; } *ANSI_ALIASING_##name
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286 #define ANSI_ALIASING_CAST(name, val) (((ANSI_ALIASING_##name) &(val))->p)
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287 ANSI_ALIASING_TYPEDEF (voidp, void *);
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288 /* VOIDP_CAST: Cast an lvalue to (void *) in a way that is ANSI-aliasing
ecf1ebac70d8 [xemacs-hg @ 2004-11-04 23:05:23 by ben]
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289 safe and will not result in GCC warnings. The result is still an
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290 lvalue, so you can assign to it or take its address. */
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291 #define VOIDP_CAST(l) ANSI_ALIASING_CAST (voidp, l)
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292
1743
543769b89fed [xemacs-hg @ 2003-10-14 05:02:57 by james]
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293 #endif /* INCLUDED_compiler_h */