mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-19 14:56:36 +00:00
22b892b44f
We only use GST_EXPORT consistently when building with MSVC by using the visual studio definitions files (win32/common/*.def), so always disable it when building with Autotools and only enable it with Meson when building with MSVC. This allows you to use MinGW to link to a GStreamer built with MSVC and get the correct function prototypes to find functions and variables in DLLs.
154 lines
5.3 KiB
C
154 lines
5.3 KiB
C
/* GStreamer
|
|
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
|
|
* 2004,2005 Wim Taymans <wim@fluendo.com>
|
|
*
|
|
* gstconfig.h: GST_DISABLE_* macros for build configuration
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
/**
|
|
* SECTION:gstconfig
|
|
* @short_description: Build configuration options
|
|
*
|
|
* This describes the configuration options for GStreamer. When building
|
|
* GStreamer there are a lot of parts (known internally as "subsystems" ) that
|
|
* can be disabled for various reasons. The most common reasons are speed and
|
|
* size, which is important because GStreamer is designed to run on embedded
|
|
* systems.
|
|
*
|
|
* If a subsystem is disabled, most of this changes are done in an API
|
|
* compatible way, so you don't need to adapt your code in most cases. It is
|
|
* never done in an ABI compatible way though. So if you want to disable a
|
|
* subsystem, you have to rebuild all programs depending on GStreamer, too.
|
|
*
|
|
* If a subsystem is disabled in GStreamer, a value is defined in
|
|
* <gst/gst.h>. You can check this if you do subsystem-specific stuff.
|
|
* <example id="example-gstconfig">
|
|
* <title>Doing subsystem specific things</title>
|
|
* <programlisting>
|
|
* &hash;ifndef GST_DISABLE_GST_DEBUG
|
|
* // do stuff specific to the debugging subsystem
|
|
* &hash;endif // GST_DISABLE_GST_DEBUG
|
|
* </programlisting>
|
|
* </example>
|
|
*/
|
|
|
|
#ifndef __GST_CONFIG_H__
|
|
#define __GST_CONFIG_H__
|
|
|
|
/* trick gtk-doc into believing these symbols are defined (yes, it's ugly) */
|
|
|
|
#if 0
|
|
#define GST_DISABLE_GST_DEBUG 1
|
|
#define GST_DISABLE_PARSE 1
|
|
#define GST_DISABLE_REGISTRY 1
|
|
#define GST_DISABLE_PLUGIN 1
|
|
#endif
|
|
|
|
/***** default padding of structures *****/
|
|
#define GST_PADDING 4
|
|
#define GST_PADDING_INIT { NULL }
|
|
|
|
/***** padding for very extensible base classes *****/
|
|
#define GST_PADDING_LARGE 20
|
|
|
|
/***** disabling of subsystems *****/
|
|
|
|
/**
|
|
* GST_DISABLE_GST_DEBUG:
|
|
*
|
|
* Configures the inclusion of the debugging subsystem
|
|
*/
|
|
@GST_DISABLE_GST_DEBUG_DEFINE@
|
|
|
|
/**
|
|
* GST_DISABLE_PARSE:
|
|
*
|
|
* Configures the inclusion of the gst-launch parser
|
|
*/
|
|
@GST_DISABLE_PARSE_DEFINE@
|
|
|
|
/**
|
|
* GST_DISABLE_REGISTRY:
|
|
*
|
|
* Configures the use of the plugin registry.
|
|
* If one disables this, required plugins need to be loaded and registered
|
|
* manually
|
|
*/
|
|
@GST_DISABLE_REGISTRY_DEFINE@
|
|
|
|
/* FIXME: test and document these! */
|
|
/* Configures the use of external plugins */
|
|
@GST_DISABLE_PLUGIN_DEFINE@
|
|
|
|
/* Whether or not the CPU supports unaligned access
|
|
* The macros used are defined consistently by GCC, Clang, MSVC, Sun, and ICC
|
|
*
|
|
* References:
|
|
* https://sourceforge.net/p/predef/wiki/Architectures/
|
|
* https://msdn.microsoft.com/en-us/library/b0084kay.aspx
|
|
* http://docs.oracle.com/cd/E19205-01/820-4155/c++_faq.html#Vers6
|
|
* https://software.intel.com/en-us/node/583402
|
|
*/
|
|
#if defined(__alpha__) || defined(__arm__) || defined(__aarch64__) || defined(__bfin) || defined(__hppa__) || defined(__mips__) || defined(__sh__) || defined(__sparc__) || defined(__sparc) || defined(__ia64__) || defined(_M_ALPHA) || defined(_M_ARM) || defined(_M_IA64)
|
|
# define GST_HAVE_UNALIGNED_ACCESS 0
|
|
#elif defined(__i386__) || defined(__i386) || defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__ppc__) || defined(__ppc64__) || defined(__m68k__) || defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64)
|
|
# define GST_HAVE_UNALIGNED_ACCESS 1
|
|
#else
|
|
# error "Could not detect architecture; don't know whether it supports unaligned access! Please file a bug."
|
|
#endif
|
|
|
|
/**
|
|
* GST_EXPORT:
|
|
*
|
|
* Export the given variable from the built shared object.
|
|
*
|
|
* On Windows, this exports the variable from the DLL.
|
|
* On other platforms, this gets defined to "extern".
|
|
*/
|
|
/**
|
|
* GST_PLUGIN_EXPORT:
|
|
*
|
|
* Export the plugin's definition.
|
|
*
|
|
* On Windows, this exports the plugin definition from the DLL.
|
|
* On other platforms, this gets defined as a no-op.
|
|
*/
|
|
/* Only use __declspec(dllexport/import) when we have been built with MSVC.
|
|
* With MinGW we still rely on the linker to auto-export/import symbols.
|
|
*
|
|
* NOTE: To link to GStreamer statically on Windows, you must define
|
|
* GST_STATIC_COMPILATION or the prototypes will cause the compiler to search
|
|
* for the symbol inside a DLL.
|
|
*/
|
|
#if @GSTCONFIG_USE_MSVC_DECLSPEC@ && !defined(GST_STATIC_COMPILATION)
|
|
# define GST_PLUGIN_EXPORT __declspec(dllexport)
|
|
# ifdef GST_EXPORTS
|
|
# define GST_EXPORT __declspec(dllexport)
|
|
# else
|
|
# define GST_EXPORT __declspec(dllimport) extern
|
|
# endif
|
|
#else
|
|
# define GST_PLUGIN_EXPORT
|
|
# if (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
|
|
# define GST_EXPORT extern __attribute__ ((visibility ("default")))
|
|
# else
|
|
# define GST_EXPORT extern
|
|
# endif
|
|
#endif
|
|
|
|
#endif /* __GST_CONFIG_H__ */
|