[gtk: 1/2] Build media backends with common_cflags and export the symbol

[Matthias Clasen <matthiasc src gnome org>]

commit 340a8e11b03368468e448cad9b12df3c7a7293f1
Author: Qiu Wenbo <qiuwenbo phytium com cn>
Date:   Fri May 22 16:45:44 2020 +0800

    Build media backends with common_cflags and export the symbol
    
    Fixes: #2771

 modules/media/gtkgstmediafile.c                   | 7 ++++++-
 modules/media/meson.build                         | 6 +-----
 modules/printbackends/gtkprintbackendcloudprint.c | 3 +++
 modules/printbackends/gtkprintbackendcups.c       | 3 +++
 modules/printbackends/gtkprintbackendfile.c       | 3 +++
 modules/printbackends/gtkprintbackendlpr.c        | 3 +++
 6 files changed, 19 insertions(+), 6 deletions(-)
---
diff --git a/modules/media/gtkgstmediafile.c b/modules/media/gtkgstmediafile.c
index 745ba3bc88..5988ef38c3 100644
--- a/modules/media/gtkgstmediafile.c
+++ b/modules/media/gtkgstmediafile.c
@@ -96,6 +96,8 @@ gtk_gst_media_file_paintable_init (GdkPaintableInterface *iface)
 G_DEFINE_TYPE_EXTENDED (GtkGstMediaFile, gtk_gst_media_file, GTK_TYPE_MEDIA_FILE, 0,
                         G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
                                                gtk_gst_media_file_paintable_init))
+
+G_MODULE_EXPORT
 void
 g_io_module_load (GIOModule *module)
 {
@@ -107,17 +109,20 @@ g_io_module_load (GIOModule *module)
                                   10);
 }
 
+G_MODULE_EXPORT
+G_GNUC_NORETURN
 void
 g_io_module_unload (GIOModule *module)
 {
   g_assert_not_reached ();
 }
 
+G_MODULE_EXPORT
 char **
 g_io_module_query (void)
 {
   char *eps[] = {
-    GTK_MEDIA_FILE_EXTENSION_POINT_NAME,
+    (char *) GTK_MEDIA_FILE_EXTENSION_POINT_NAME,
     NULL
   };
 
diff --git a/modules/media/meson.build b/modules/media/meson.build
index 8a05ccb565..c6dbed1f26 100644
--- a/modules/media/meson.build
+++ b/modules/media/meson.build
@@ -24,11 +24,7 @@ media_subdir = 'gtk-4.0/@0@/media'.format(gtk_binary_version)
 media_install_dir = join_paths(get_option('libdir'), media_subdir)
 
 extra_c_args = ['-DGTK_COMPILATION']
-
-# Detect and set symbol visibility
-if cc.get_id() == 'msvc'
-  extra_c_args += ['-D_GLIB_EXTERN=__declspec (dllexport) extern']
-endif
+extra_c_args += common_cflags
 
 if media_backends.contains('ffmpeg')
   libavfilter_dep = dependency('libavfilter', version: '>= 6.47.100', required: true)
diff --git a/modules/printbackends/gtkprintbackendcloudprint.c 
b/modules/printbackends/gtkprintbackendcloudprint.c
index 6a5d7755af..99dc5f3665 100644
--- a/modules/printbackends/gtkprintbackendcloudprint.c
+++ b/modules/printbackends/gtkprintbackendcloudprint.c
@@ -103,6 +103,7 @@ void                 t_goa_account_free                 (gpointer data);
 
 G_DEFINE_DYNAMIC_TYPE (GtkPrintBackendCloudprint, gtk_print_backend_cloudprint, GTK_TYPE_PRINT_BACKEND)
 
+G_MODULE_EXPORT
 void
 g_io_module_load (GIOModule *module)
 {
@@ -118,11 +119,13 @@ g_io_module_load (GIOModule *module)
                                   10);
 }
 
+G_MODULE_EXPORT
 void
 g_io_module_unload (GIOModule *module)
 {
 }
 
+G_MODULE_EXPORT
 char **
 g_io_module_query (void)
 {
diff --git a/modules/printbackends/gtkprintbackendcups.c b/modules/printbackends/gtkprintbackendcups.c
index fe6150e165..e875e9403b 100644
--- a/modules/printbackends/gtkprintbackendcups.c
+++ b/modules/printbackends/gtkprintbackendcups.c
@@ -236,6 +236,7 @@ static void                 secrets_service_vanished_cb             (GDBusConnec
 
 G_DEFINE_DYNAMIC_TYPE(GtkPrintBackendCups, gtk_print_backend_cups, GTK_TYPE_PRINT_BACKEND)
 
+G_MODULE_EXPORT
 void
 g_io_module_load (GIOModule *module)
 {
@@ -250,11 +251,13 @@ g_io_module_load (GIOModule *module)
                                   10);
 }
 
+G_MODULE_EXPORT
 void
 g_io_module_unload (GIOModule *module)
 {
 }
 
+G_MODULE_EXPORT
 char **
 g_io_module_query (void)
 {
diff --git a/modules/printbackends/gtkprintbackendfile.c b/modules/printbackends/gtkprintbackendfile.c
index 071ebec359..3486805688 100644
--- a/modules/printbackends/gtkprintbackendfile.c
+++ b/modules/printbackends/gtkprintbackendfile.c
@@ -102,6 +102,7 @@ static GtkPageSetup *       file_printer_get_default_page_size     (GtkPrinter
 
 G_DEFINE_DYNAMIC_TYPE(GtkPrintBackendFile, gtk_print_backend_file, GTK_TYPE_PRINT_BACKEND)
 
+G_MODULE_EXPORT
 void
 g_io_module_load (GIOModule *module)
 {
@@ -115,11 +116,13 @@ g_io_module_load (GIOModule *module)
                                   10);
 }
 
+G_MODULE_EXPORT
 void
 g_io_module_unload (GIOModule *module)
 {
 }
 
+G_MODULE_EXPORT
 char **
 g_io_module_query (void)
 {
diff --git a/modules/printbackends/gtkprintbackendlpr.c b/modules/printbackends/gtkprintbackendlpr.c
index cef1501c30..0626e594fa 100644
--- a/modules/printbackends/gtkprintbackendlpr.c
+++ b/modules/printbackends/gtkprintbackendlpr.c
@@ -83,6 +83,7 @@ static void                 gtk_print_backend_lpr_print_stream    (GtkPrintBacke
 
 G_DEFINE_DYNAMIC_TYPE (GtkPrintBackendLpr, gtk_print_backend_lpr, GTK_TYPE_PRINT_BACKEND)
 
+G_MODULE_EXPORT
 void
 g_io_module_load (GIOModule *module)
 {
@@ -96,11 +97,13 @@ g_io_module_load (GIOModule *module)
                                   10);
 }
 
+G_MODULE_EXPORT
 void
 g_io_module_unload (GIOModule *module)
 {
 }
 
+G_MODULE_EXPORT
 char **
 g_io_module_query (void)
 {