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161eee6694
__declspec(dllexport/import) are supported by GCC and are needed for properly generating code that fetches the values of constants from DLLs built with __declspec(dllexport) which happens when anything using GST_EXPORT is built with MSVC. See: https://msdn.microsoft.com/en-us/library/619w14ds.aspx Essentially, if you built gstreamer with MSVC and then tried to use constants from it (such as GST_TYPE_CAPS) in a plugin, GCC would retrieve the address of the value instead of the value itself.
152 lines
4.4 KiB
C
152 lines
4.4 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2004,2005 Wim Taymans <wim@fluendo.com>
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*
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* gstconfig.h: GST_DISABLE_* macros for build configuration
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstconfig
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* @short_description: Build configuration options
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*
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* This describes the configuration options for GStreamer. When building
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* GStreamer there are a lot of parts (known internally as "subsystems" ) that
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* can be disabled for various reasons. The most common reasons are speed and
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* size, which is important because GStreamer is designed to run on embedded
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* systems.
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*
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* If a subsystem is disabled, most of this changes are done in an API
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* compatible way, so you don't need to adapt your code in most cases. It is
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* never done in an ABI compatible way though. So if you want to disable a
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* subsystem, you have to rebuild all programs depending on GStreamer, too.
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*
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* If a subsystem is disabled in GStreamer, a value is defined in
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* <gst/gst.h>. You can check this if you do subsystem-specific stuff.
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* <example id="example-gstconfig">
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* <title>Doing subsystem specific things</title>
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* <programlisting>
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* &hash;ifndef GST_DISABLE_GST_DEBUG
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* // do stuff specific to the debugging subsystem
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* &hash;endif // GST_DISABLE_GST_DEBUG
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* </programlisting>
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* </example>
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*/
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#ifndef __GST_CONFIG_H__
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#define __GST_CONFIG_H__
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/* trick gtk-doc into believing these symbols are defined (yes, it's ugly) */
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#if 0
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#define GST_DISABLE_GST_DEBUG 1
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#define GST_DISABLE_PARSE 1
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#define GST_DISABLE_TRACE 1
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#define GST_DISABLE_ALLOC_TRACE 1
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#define GST_DISABLE_REGISTRY 1
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#define GST_DISABLE_PLUGIN 1
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#define GST_HAVE_GLIB_2_8 1
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#endif
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/***** default padding of structures *****/
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#define GST_PADDING 4
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#define GST_PADDING_INIT { NULL }
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/***** padding for very extensible base classes *****/
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#define GST_PADDING_LARGE 20
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/***** disabling of subsystems *****/
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/**
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* GST_DISABLE_GST_DEBUG:
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*
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* Configures the inclusion of the debugging subsystem
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*/
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@GST_DISABLE_GST_DEBUG_DEFINE@
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/**
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* GST_DISABLE_PARSE:
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*
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* Configures the inclusion of the gst-launch parser
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*/
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@GST_DISABLE_PARSE_DEFINE@
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/**
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* GST_DISABLE_TRACE:
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*
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* Configures the inclusion of a resource tracing facility
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* (seems to be unused)
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*/
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@GST_DISABLE_TRACE_DEFINE@
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/**
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* GST_DISABLE_ALLOC_TRACE:
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*
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* Configures the use of a memory tracer based on the resource tracer
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* if TRACE is disabled, ALLOC_TRACE is disabled as well
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*/
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@GST_DISABLE_ALLOC_TRACE_DEFINE@
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/**
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* GST_DISABLE_REGISTRY:
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*
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* Configures the use of the plugin registry.
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* If one disables this, required plugins need to be loaded and registered
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* manually
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*/
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@GST_DISABLE_REGISTRY_DEFINE@
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/* FIXME: test and document these! */
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/* Configures the use of external plugins */
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@GST_DISABLE_PLUGIN_DEFINE@
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/* whether or not the CPU supports unaligned access */
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@GST_HAVE_UNALIGNED_ACCESS_DEFINE@
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/**
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* GST_EXPORT:
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*
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* Export the given variable from the built shared object.
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*
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* On Windows, this exports the variable from the DLL.
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* On other platforms, this gets defined to "extern".
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*/
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/**
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* GST_PLUGIN_EXPORT:
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*
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* Export the plugin's definition.
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*
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* On Windows, this exports the plugin definition from the DLL.
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* On other platforms, this gets defined as a no-op.
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*/
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#ifdef _WIN32 /* Both 32-bit and 64-bit; both GCC and MSVC */
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#define GST_PLUGIN_EXPORT __declspec(dllexport) extern
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#ifdef GST_EXPORTS
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#define GST_EXPORT __declspec(dllexport) extern
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#else
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#define GST_EXPORT __declspec(dllimport) extern
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#endif
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#else /* !_WIN32 */
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#define GST_PLUGIN_EXPORT
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#if (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
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#define GST_EXPORT extern __attribute__ ((visibility ("default")))
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#else
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#define GST_EXPORT extern
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#endif
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#endif
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#endif /* __GST_CONFIG_H__ */
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