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win32: Don't use dllexport/import when only building statically

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If the prototypes in the public API have dllimport in them when building
statically on Windows, the compiler will look for symbols with symbol
mangling and indirection corresponding to a DLL. This will cause a build
failure when trying to link tests/examples/etc.

External users of GStreamer also need to define -DGST_STATIC_COMPILATION
if they want to link to static gstreamer libraries on Windows.

A similar version of this patch has been committed to all gstreamer
repositories.

https://bugzilla.gnome.org/show_bug.cgi?id=767463
This commit is contained in:
Nirbheek Chauhan 2016-06-21 19:49:15 +05:30 committed by Tim-Philipp Müller
parent 084bb505f4
commit 48088867db
2 changed files with 15 additions and 3 deletions
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10
configure.ac
View file

@ -188,6 +188,12 @@ fi
AC_SUBST(GST_PLUGIN_LIBTOOLFLAGS)
AM_CONDITIONAL(GST_PLUGIN_BUILD_STATIC, test "x$enable_static_plugins" = "xyes")
dnl If only building static libraries, define GST_STATIC_COMPILATION. This is
dnl needed only on Windows, but it doesn't hurt to have it everywhere.
if test x$enable_static = xyes -a x$enable_shared = xno; then
GST_OBJ_STATIC_CFLAGS="-DGST_STATIC_COMPILATION"
fi
dnl building of tests
AC_ARG_ENABLE(tests,
AS_HELP_STRING([--disable-tests],[disable building test apps]),
@ -950,8 +956,8 @@ AC_SUBST(GST_LIB_LDFLAGS)
dnl GST_OBJ_*
dnl default vars for all internal objects built on libgstreamer
dnl includes GST_ALL_*
GST_OBJ_CFLAGS="\$(GST_ALL_CFLAGS)"
GST_OBJ_CXXFLAGS="\$(GST_ALL_CXXFLAGS)"
GST_OBJ_CFLAGS="\$(GST_ALL_CFLAGS) $GST_OBJ_STATIC_CFLAGS"
GST_OBJ_CXXFLAGS="\$(GST_ALL_CXXFLAGS) $GST_OBJ_STATIC_CFLAGS"
GST_OBJ_LIBS="\$(top_builddir)/gst/libgstreamer-$GST_API_VERSION.la \$(GST_ALL_LIBS)"
AC_SUBST(GST_OBJ_CFLAGS)
AC_SUBST(GST_OBJ_CXXFLAGS)

8
gst/gstconfig.h.in
View file

@ -133,7 +133,13 @@
* On Windows, this exports the plugin definition from the DLL.
* On other platforms, this gets defined as a no-op.
*/
#ifdef _WIN32 /* Both 32-bit and 64-bit; both GCC and MSVC */
/* Macro _WIN32 is defined on 32-bit and 64-bit Windows; by both GCC and MSVC
*
* NOTE: To link to Windows 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 defined(_WIN32) && !defined(GST_STATIC_COMPILATION)
# define GST_PLUGIN_EXPORT __declspec(dllexport) extern
# ifdef GST_EXPORTS
# define GST_EXPORT __declspec(dllexport) extern