2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2004,2005 Wim Taymans <wim@fluendo.com>
5 * gstconfig.h: GST_DISABLE_* macros for build configuration
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.
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.
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.
25 * @short_description: Build configuration options
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
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.
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 * <example id="example-gstconfig">
41 * <title>Doing subsystem specific things</title>
43 * &hash;ifndef GST_DISABLE_GST_DEBUG
44 * // do stuff specific to the debugging subsystem
45 * &hash;endif // GST_DISABLE_GST_DEBUG
50 #ifndef __GST_CONFIG_H__
51 #define __GST_CONFIG_H__
53 /* trick gtk-doc into believing these symbols are defined (yes, it's ugly) */
56 #define GST_DISABLE_GST_DEBUG 1
57 #define GST_DISABLE_PARSE 1
58 #define GST_DISABLE_REGISTRY 1
59 #define GST_DISABLE_PLUGIN 1
62 /***** default padding of structures *****/
64 #define GST_PADDING_INIT { NULL }
66 /***** padding for very extensible base classes *****/
67 #define GST_PADDING_LARGE 20
69 /***** disabling of subsystems *****/
72 * GST_DISABLE_GST_DEBUG:
74 * Configures the inclusion of the debugging subsystem
76 @GST_DISABLE_GST_DEBUG_DEFINE@
81 * Configures the inclusion of the gst-launch parser
83 @GST_DISABLE_PARSE_DEFINE@
86 * GST_DISABLE_REGISTRY:
88 * Configures the use of the plugin registry.
89 * If one disables this, required plugins need to be loaded and registered
92 @GST_DISABLE_REGISTRY_DEFINE@
94 /* FIXME: test and document these! */
95 /* Configures the use of external plugins */
96 @GST_DISABLE_PLUGIN_DEFINE@
98 /* Whether or not the CPU supports unaligned access
99 * The macros used are defined consistently by GCC, Clang, MSVC, Sun, and ICC
102 * https://sourceforge.net/p/predef/wiki/Architectures/
103 * https://msdn.microsoft.com/en-us/library/b0084kay.aspx
104 * http://docs.oracle.com/cd/E19205-01/820-4155/c++_faq.html#Vers6
105 * https://software.intel.com/en-us/node/583402
107 #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_IA64) || defined(__xtensa__)
108 # define GST_HAVE_UNALIGNED_ACCESS 0
109 #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__)
110 # define GST_HAVE_UNALIGNED_ACCESS 1
112 # error "Could not detect architecture; don't know whether it supports unaligned access! Please file a bug."
118 * Export the given variable from the built shared object.
120 * On Windows, this exports the variable from the DLL.
121 * On other platforms, this gets defined to "extern".
126 * Export the plugin's definition.
128 * On Windows, this exports the plugin definition from the DLL.
129 * On other platforms, this gets defined as a no-op.
131 /* Only use __declspec(dllexport/import) when we have been built with MSVC or
132 * the user is linking to us with MSVC. The only remaining case is when we were
133 * built with MinGW and are linking with MinGW in which case we rely on the
134 * linker to auto-export/import symbols. Of course all this is only used when
135 * not linking statically.
137 * NOTE: To link to GStreamer statically on Windows, you must define
138 * GST_STATIC_COMPILATION or the prototypes will cause the compiler to search
139 * for the symbol inside a DLL.
141 #if (@GSTCONFIG_BUILT_WITH_MSVC@ || defined(_MSC_VER)) && !defined(GST_STATIC_COMPILATION)
142 # define GST_PLUGIN_EXPORT __declspec(dllexport)
144 # define GST_EXPORT __declspec(dllexport)
146 # define GST_EXPORT __declspec(dllimport) extern
149 # define GST_PLUGIN_EXPORT
150 # if (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
151 # define GST_EXPORT extern __attribute__ ((visibility ("default")))
153 # define GST_EXPORT extern
157 /* These macros are used to mark deprecated functions in GStreamer headers,
158 * and thus have to be exposed in installed headers. But please
159 * do *not* use them in other projects. Instead, use G_DEPRECATED
160 * or define your own wrappers around it. */
161 #ifdef GST_DISABLE_DEPRECATED
162 #define GST_DEPRECATED GST_EXPORT
163 #define GST_DEPRECATED_FOR(f) GST_EXPORT
165 #define GST_DEPRECATED G_DEPRECATED GST_EXPORT
166 #define GST_DEPRECATED_FOR(f) G_DEPRECATED_FOR(f) GST_EXPORT
169 #endif /* __GST_CONFIG_H__ */