1 /* GStreamer 2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> 3 * 2004,2005 Wim Taymans <wim@fluendo.com> 4 * 5 * gstconfig.h: GST_DISABLE_* macros for build configuration 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public 18 * License along with this library; if not, write to the 19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 20 * Boston, MA 02110-1301, USA. 21 */ 22 23 /** 24 * SECTION:gstconfig 25 * @short_description: Build configuration options 26 * 27 * This describes the configuration options for GStreamer. When building 28 * GStreamer there are a lot of parts (known internally as "subsystems" ) that 29 * can be disabled for various reasons. The most common reasons are speed and 30 * size, which is important because GStreamer is designed to run on embedded 31 * systems. 32 * 33 * If a subsystem is disabled, most of this changes are done in an API 34 * compatible way, so you don't need to adapt your code in most cases. It is 35 * never done in an ABI compatible way though. So if you want to disable a 36 * subsystem, you have to rebuild all programs depending on GStreamer, too. 37 * 38 * If a subsystem is disabled in GStreamer, a value is defined in 39 * <gst/gst.h>. You can check this if you do subsystem-specific stuff. 40 * 41 * ``` C 42 * #ifndef GST_DISABLE_GST_DEBUG 43 * // do stuff specific to the debugging subsystem 44 * #endif // GST_DISABLE_GST_DEBUG 45 * ``` 46 */ 47 48 #ifndef __GST_CONFIG_H__ 49 #define __GST_CONFIG_H__ 50 51 /* trick gtk-doc into believing these symbols are defined (yes, it's ugly) */ 52 53 #if 0 54 #define GST_DISABLE_GST_DEBUG 1 55 #define GST_DISABLE_PARSE 1 56 #define GST_DISABLE_REGISTRY 1 57 #define GST_DISABLE_PLUGIN 1 58 #endif 59 60 /***** default padding of structures *****/ 61 #define GST_PADDING 4 62 #define GST_PADDING_INIT { NULL } 63 64 /***** padding for very extensible base classes *****/ 65 #define GST_PADDING_LARGE 20 66 67 /***** disabling of subsystems *****/ 68 69 /** 70 * GST_DISABLE_GST_DEBUG: 71 * 72 * Configures the inclusion of the debugging subsystem 73 */ 74 #undef GST_DISABLE_GST_DEBUG 75 76 #ifdef OHOS_OPT_COMPAT 77 /* ohos.opt.compat.0064 78 * for remove GPL-3.0 files grammar.tab.c 79 */ 80 #define GST_DISABLE_PARSE 81 #else 82 /** 83 * GST_DISABLE_PARSE: 84 * 85 * Configures the inclusion of the gst-launch parser 86 */ 87 #undef GST_DISABLE_PARSE 88 #endif 89 90 /** 91 * GST_DISABLE_REGISTRY: 92 * 93 * Configures the use of the plugin registry. 94 * If one disables this, required plugins need to be loaded and registered 95 * manually 96 */ 97 #undef GST_DISABLE_REGISTRY 98 99 /** 100 * GST_DISABLE_CAST_CHECKS: 101 * 102 * Disable run-time GObject cast checks 103 */ 104 #define GST_DISABLE_CAST_CHECKS 0 105 106 /** 107 * GST_DISABLE_GLIB_ASSERTS: 108 * 109 * Disable GLib assertion 110 */ 111 #define GST_DISABLE_GLIB_ASSERTS 0 112 113 /** 114 * GST_DISABLE_GLIB_CHECKS: 115 * 116 * Disable GLib checks such as API guards 117 */ 118 #define GST_DISABLE_GLIB_CHECKS 0 119 120 121 /* FIXME: test and document these! */ 122 /* Configures the use of external plugins */ 123 #undef GST_DISABLE_PLUGIN 124 125 /* Whether or not the CPU supports unaligned access 126 * The macros used are defined consistently by GCC, Clang, MSVC, Sun, and ICC 127 * 128 * References: 129 * https://sourceforge.net/p/predef/wiki/Architectures/ 130 * https://msdn.microsoft.com/en-us/library/b0084kay.aspx 131 * http://docs.oracle.com/cd/E19205-01/820-4155/c++_faq.html#Vers6 132 * https://software.intel.com/en-us/node/583402 133 */ 134 #if defined(__alpha__) || defined(__arc__) || defined(__arm__) || defined(__aarch64__) || defined(__bfin) || defined(__hppa__) || defined(__nios2__) || defined(__MICROBLAZE__) || defined(__mips__) || defined(__or1k__) || defined(__sh__) || defined(__SH4__) || defined(__sparc__) || defined(__sparc) || defined(__ia64__) || defined(_M_ALPHA) || defined(_M_ARM) || defined(_M_ARM64) || defined(_M_IA64) || defined(__xtensa__) || defined(__e2k__) || defined(__riscv) || defined(__ARC64__) || defined(__loongarch__) 135 # define GST_HAVE_UNALIGNED_ACCESS 0 136 #elif defined(__i386__) || defined(__i386) || defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__ppc__) || defined(__ppc64__) || defined(__powerpc__) || defined(__powerpc64__) || defined(__m68k__) || defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || defined(__s390__) || defined(__s390x__) || defined(__zarch__) 137 # define GST_HAVE_UNALIGNED_ACCESS 1 138 #else 139 # error "Could not detect architecture; don't know whether it supports unaligned access! Please file a bug." 140 #endif 141 142 /** 143 * GST_EXPORT: 144 * 145 * Export the given variable from the built shared object. 146 * 147 * On Windows, this exports the variable from the DLL. 148 * On other platforms, this gets defined to "extern". 149 */ 150 /** 151 * GST_PLUGIN_EXPORT: 152 * 153 * Export the plugin's definition. 154 * 155 * On Windows, this exports the plugin definition from the DLL. 156 * On other platforms, this gets defined as a no-op. 157 */ 158 /* Only use __declspec(dllexport/import) when we have been built with MSVC or 159 * the user is linking to us with MSVC. The only remaining case is when we were 160 * built with MinGW and are linking with MinGW in which case we rely on the 161 * linker to auto-export/import symbols. Of course all this is only used when 162 * not linking statically. 163 * 164 * NOTE: To link to GStreamer statically on Windows, you must define 165 * GST_STATIC_COMPILATION or the prototypes will cause the compiler to search 166 * for the symbol inside a DLL. 167 */ 168 #if (0 || defined(_MSC_VER)) && !defined(GST_STATIC_COMPILATION) 169 # define GST_PLUGIN_EXPORT __declspec(dllexport) 170 # ifdef GST_EXPORTS 171 # define GST_EXPORT __declspec(dllexport) 172 # else 173 # define GST_EXPORT __declspec(dllimport) extern 174 # endif 175 #else 176 # if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) 177 # define GST_PLUGIN_EXPORT __attribute__ ((visibility ("default"))) 178 # define GST_EXPORT extern __attribute__ ((visibility ("default"))) 179 # else 180 # define GST_PLUGIN_EXPORT 181 # define GST_EXPORT extern 182 # endif 183 #endif 184 185 #if defined(_MSC_VER) && !defined(GST_STATIC_COMPILATION) 186 # define GST_API_IMPORT __declspec(dllimport) extern 187 #else 188 # define GST_API_IMPORT extern 189 #endif 190 191 #ifndef GST_API 192 # ifdef BUILDING_GST 193 # define GST_API GST_API_EXPORT /* from config.h */ 194 # else 195 # define GST_API GST_API_IMPORT 196 # endif 197 #endif 198 199 /* These macros are used to mark deprecated functions in GStreamer headers, 200 * and thus have to be exposed in installed headers. But please 201 * do *not* use them in other projects. Instead, use G_DEPRECATED 202 * or define your own wrappers around it. */ 203 #ifndef GST_DISABLE_DEPRECATED 204 #define GST_DEPRECATED GST_API 205 #define GST_DEPRECATED_FOR(f) GST_API 206 #else 207 #define GST_DEPRECATED G_DEPRECATED GST_API 208 #define GST_DEPRECATED_FOR(f) G_DEPRECATED_FOR(f) GST_API 209 #endif 210 211 #endif /* __GST_CONFIG_H__ */ 212