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gstconfig: Decide GST_EXPORT declaration style at build time

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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.
This commit is contained in:
Nirbheek Chauhan 2016-08-26 19:27:22 +05:30 committed by Tim-Philipp Müller
parent c7e8b062e3
commit 22b892b44f
3 changed files with 19 additions and 5 deletions
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5
configure.ac
View file

@ -131,6 +131,11 @@ AG_GST_SET_PACKAGE_RELEASE_DATETIME_WITH_NANO([$PACKAGE_VERSION_NANO],
["${srcdir}/gstreamer.doap"], ["${srcdir}/gstreamer.doap"],
[$PACKAGE_VERSION_MAJOR.$PACKAGE_VERSION_MINOR.$PACKAGE_VERSION_MICRO]) [$PACKAGE_VERSION_MAJOR.$PACKAGE_VERSION_MINOR.$PACKAGE_VERSION_MICRO])
# We only use this when building with MSVC, which is only done with the
# alternate Meson build system files
GSTCONFIG_USE_MSVC_DECLSPEC=0
AC_SUBST(GSTCONFIG_USE_MSVC_DECLSPEC)
dnl check for bash completion dnl check for bash completion
AC_ARG_WITH([bash-completion-dir], AC_ARG_WITH([bash-completion-dir],
AS_HELP_STRING([--with-bash-completion-dir[=PATH]], AS_HELP_STRING([--with-bash-completion-dir[=PATH]],

11
gst/gstconfig.h.in
View file

@ -128,20 +128,21 @@
* On Windows, this exports the plugin definition from the DLL. * On Windows, this exports the plugin definition from the DLL.
* On other platforms, this gets defined as a no-op. * On other platforms, this gets defined as a no-op.
*/ */
/* Macro _WIN32 is defined on 32-bit and 64-bit Windows; by both GCC and MSVC /* 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 Windows statically on Windows, you must define * NOTE: To link to GStreamer statically on Windows, you must define
* GST_STATIC_COMPILATION or the prototypes will cause the compiler to search * GST_STATIC_COMPILATION or the prototypes will cause the compiler to search
* for the symbol inside a DLL * for the symbol inside a DLL.
*/ */
#if defined(_WIN32) && !defined(GST_STATIC_COMPILATION) #if @GSTCONFIG_USE_MSVC_DECLSPEC@ && !defined(GST_STATIC_COMPILATION)
# define GST_PLUGIN_EXPORT __declspec(dllexport) # define GST_PLUGIN_EXPORT __declspec(dllexport)
# ifdef GST_EXPORTS # ifdef GST_EXPORTS
# define GST_EXPORT __declspec(dllexport) # define GST_EXPORT __declspec(dllexport)
# else # else
# define GST_EXPORT __declspec(dllimport) extern # define GST_EXPORT __declspec(dllimport) extern
# endif # endif
#else /* !_WIN32 */ #else
# define GST_PLUGIN_EXPORT # define GST_PLUGIN_EXPORT
# if (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) # if (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
# define GST_EXPORT extern __attribute__ ((visibility ("default"))) # define GST_EXPORT extern __attribute__ ((visibility ("default")))

8
meson.build
View file

@ -221,6 +221,14 @@ if cc.has_function('strsignal', prefix : '#include <string.h>')
cdata.set('HAVE_DECL_STRSIGNAL', 1) cdata.set('HAVE_DECL_STRSIGNAL', 1)
endif endif
# We only want to use the __declspec(dllexport/import) dance in GST_EXPORT when
# building with MSVC
if cc.get_id() == 'msvc'
cdata.set('GSTCONFIG_USE_MSVC_DECLSPEC', 1)
else
cdata.set('GSTCONFIG_USE_MSVC_DECLSPEC', 0)
endif
configure_file(input : 'config.h.meson', configure_file(input : 'config.h.meson',
output : 'config.h', output : 'config.h',
configuration : cdata) configuration : cdata)