[totem] build: Add a dependency on generated libbacon files

[Emmanuele Bassi <ebassi src gnome org>]

commit 2903ddf56cf432459516dadbda90ab84b77025c8
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Aug 10 14:09:25 2017 +0100

    build: Add a dependency on generated libbacon files
    
    In cases of large parallelism, the totem files may be compiled before
    the libbacon headers are generated. The declare_dependency() object can
    be instructed to transfer that dependency not just on the library to
    link with, but also to the sources that need to exist in order to build
    other targets that depend on those sources.

 src/backend/meson.build |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/src/backend/meson.build b/src/backend/meson.build
index 4b0de0e..28c8e12 100644
--- a/src/backend/meson.build
+++ b/src/backend/meson.build
@@ -45,7 +45,9 @@ sources = files(
 enums = 'bacon-video-widget-enums'
 enums_header = files('bacon-video-widget.h')
 
-sources += gnome.mkenums(
+libbacon_gen_sources = []
+
+libbacon_gen_sources += gnome.mkenums(
   enums + '.h',
   sources: enums_header,
   fhead: '#ifndef BVW_ENUMS_H\n#define BVW_ENUMS_H\n\n#include <glib-object.h>\n\nG_BEGIN_DECLS\n',
@@ -54,7 +56,7 @@ sources += gnome.mkenums(
   ftail: 'G_END_DECLS\n\n#endif /* !BVW_ENUMS_H */'
 )
 
-sources += gnome.mkenums(
+libbacon_gen_sources += gnome.mkenums(
   enums + '.c',
   sources: enums_header,
   fhead: '#include "bacon-video-widget.h"\n#include "bacon-video-widget-enums.h"',
@@ -93,7 +95,7 @@ libbacon_video_widget_cflags = common_flags + warn_flags + [
 
 libbacon_video_widget = static_library(
   'baconvideowidget',
-  sources: sources,
+  sources: sources + libbacon_gen_sources,
   include_directories: libbacon_video_widget_incs,
   dependencies: libbacon_video_widget_deps,
   c_args: libbacon_video_widget_cflags
@@ -102,7 +104,8 @@ libbacon_video_widget = static_library(
 libbacon_video_widget_dep = declare_dependency(
   link_with: libbacon_video_widget,
   include_directories: backend_inc,
-  dependencies: libbacon_video_widget_deps
+  dependencies: libbacon_video_widget_deps,
+  sources: libbacon_gen_sources
 )
 
 if have_easy_codec