gstreamer-full: add GST_STATIC_COMPILATION for Windows

In the case of a gstreamer-full target type to static,
the GST_STATIC_COMPILATION is necessary on Windows to avoid
a different mangling from the external project using the
gstreamer-full libraries (ie dllimport).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4128>

meson.build

@@ -87,7 +87,6 @@ endif
 building_full = get_option('default_library') == 'static'
 building_full_static = get_option('gst-full-target-type') == 'static_library'
 buildind_full_options = []
-
 if building_full
 buildind_full_options = ['gstreamer-full=enabled']
 endif
@@ -438,7 +437,13 @@ if building_full
     link_depends : link_deps,
     install : true,
   )
+  gst_full_c_flags =  []
+  if building_full_static
+    gst_full_c_flags += ['-DGST_STATIC_COMPILATION']
+  endif
+
   gst_full_dep = declare_dependency(link_with: gstfull,
+    compile_args: gst_full_c_flags,
     dependencies : incdir_deps + glib_deps,
     include_directories: include_directories('.')
   )
@@ -473,6 +478,7 @@ if building_full
   pkgconfig.generate(gstfull,
     requires: glib_deps,
     libraries_private: gst_full_libs_private,
+    extra_cflags: gst_full_c_flags,
     subdirs : 'gstreamer-1.0')
   meson.override_dependency('gstreamer-full-1.0', gst_full_dep)
 

subprojects/gstreamer/gst/meson.build

@@ -274,6 +274,11 @@ libgst = library('gstreamer-1.0', gst_sources,
                   backtrace_deps, platform_deps, extra_deps],
 )
 
+gst_compile_args = []
+if static_build
+  gst_compile_args += ['-DGST_STATIC_COMPILATION']
+endif
+
 pkg_name = 'gstreamer-1.0'
 library_def = {'lib': libgst}
 pkgconfig.generate(libgst,
@@ -283,6 +288,7 @@ pkgconfig.generate(libgst,
   subdirs : pkgconfig_subdirs,
   name : pkg_name,
   description : 'Streaming media framework',
+  extra_cflags: gst_compile_args,
 )
 
 if build_gir
@@ -323,10 +329,7 @@ if build_gir
 endif
 gst_libraries += [[pkg_name, library_def]]
 
-gst_compile_args = []
-if get_option('default_library') == 'static'
-  gst_compile_args += ['-DGST_STATIC_COMPILATION']
-endif
+
 
 gst_dep = declare_dependency(link_with : libgst,
   compile_args : gst_compile_args,