Use a central header.

$ time (make clean; make)

Before: ~8.0 seconds
After: ~8.1 seconds

CMakeLists.txt

@@ -95,6 +95,7 @@ set (logdiag_SOURCES
 	src/ld-lua-symbol.c)
 set (logdiag_HEADERS
 	${CMAKE_CURRENT_BINARY_DIR}/config.h
+	src/liblogdiag.h
 	src/ld-marshal.h
 	src/ld-types.h
 	src/ld-window-main.h

src/ld-canvas.c

@@ -10,21 +10,11 @@
 
 #include <math.h>
 #include <string.h>
-
-#include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>
 
+#include "liblogdiag.h"
 #include "config.h"
 
-#include "ld-marshal.h"
-#include "ld-types.h"
-#include "ld-diagram-object.h"
-#include "ld-diagram-symbol.h"
-#include "ld-diagram.h"
-#include "ld-symbol.h"
-#include "ld-library.h"
-#include "ld-canvas.h"
-
 
 /**
  * SECTION:ld-canvas

src/ld-diagram-object.c

@@ -8,12 +8,9 @@
  *
  */
 
-#include <gtk/gtk.h>
+#include "liblogdiag.h"
-
 #include "config.h"
 
-#include "ld-diagram-object.h"
-
 
 /**
  * SECTION:ld-diagram-object

src/ld-diagram-symbol.c

@@ -8,13 +8,9 @@
  *
  */
 
-#include <gtk/gtk.h>
+#include "liblogdiag.h"
-
 #include "config.h"
 
-#include "ld-diagram-object.h"
-#include "ld-diagram-symbol.h"
-
 
 /**
  * SECTION:ld-diagram-symbol

src/ld-diagram.c

@@ -8,14 +8,9 @@
  *
  */
 
-#include <gtk/gtk.h>
+#include "liblogdiag.h"
-#include <json-glib/json-glib.h>
-
 #include "config.h"
 
-#include "ld-diagram-object.h"
-#include "ld-diagram.h"
-
 
 /**
  * SECTION:ld-diagram

src/ld-library.c

@@ -10,18 +10,9 @@
 
 #include <string.h>
 
-#include <gtk/gtk.h>
+#include "liblogdiag.h"
-#include <json-glib/json-glib.h>
-
 #include "config.h"
 
-#include "ld-types.h"
-#include "ld-symbol.h"
-#include "ld-symbol-category.h"
-#include "ld-library.h"
-
-#include "ld-lua.h"
-
 
 /**
  * SECTION:ld-library

src/ld-lua-symbol.c

@@ -8,18 +8,9 @@
  *
  */
 
-#include <gtk/gtk.h>
+#include "liblogdiag.h"
-
 #include "config.h"
 
-#include "ld-types.h"
-#include "ld-symbol.h"
-#include "ld-symbol-category.h"
-#include "ld-library.h"
-
-#include "ld-lua.h"
-#include "ld-lua-symbol.h"
-
 #include "ld-lua-private.h"
 #include "ld-lua-symbol-private.h"
 

src/ld-lua.c

@@ -8,20 +8,13 @@
  *
  */
 
-#include <gtk/gtk.h>
 #include <lua.h>
 #include <lualib.h>
 #include <lauxlib.h>
 
+#include "liblogdiag.h"
 #include "config.h"
 
-#include "ld-types.h"
-#include "ld-symbol.h"
-#include "ld-library.h"
-
-#include "ld-lua.h"
-#include "ld-lua-symbol.h"
-
 #include "ld-lua-private.h"
 #include "ld-lua-symbol-private.h"
 

src/ld-symbol-category.c

@@ -8,15 +8,9 @@
  *
  */
 
-#include <gtk/gtk.h>
+#include "liblogdiag.h"
-
 #include "config.h"
 
-#include "ld-types.h"
-#include "ld-symbol.h"
-#include "ld-symbol-category.h"
-#include "ld-library.h"
-
 
 /**
  * SECTION:ld-symbol-category

src/ld-symbol.c

@@ -8,15 +8,9 @@
  *
  */
 
-#include <gtk/gtk.h>
+#include "liblogdiag.h"
-
 #include "config.h"
 
-#include "ld-types.h"
-#include "ld-symbol.h"
-#include "ld-symbol-category.h"
-#include "ld-library.h"
-
 
 /**
  * SECTION:ld-symbol

src/ld-types.c

@@ -10,12 +10,9 @@
 
 #include <math.h>
 
-#include <gtk/gtk.h>
+#include "liblogdiag.h"
-
 #include "config.h"
 
-#include "ld-types.h"
-
 
 #define DEFINE_BOXED_TYPE(TypeName, type_name) \
 GType \

src/ld-window-main.c

@@ -10,21 +10,11 @@
 
 #include <gtk/gtk.h>
 
+#include "liblogdiag.h"
 #include "config.h"
 
 #include "ld-window-main.h"
 
-#include "ld-types.h"
-#include "ld-symbol.h"
-#include "ld-symbol-category.h"
-#include "ld-library.h"
-
-#include "ld-diagram-object.h"
-#include "ld-diagram-symbol.h"
-#include "ld-diagram.h"
-
-#include "ld-canvas.h"
-
 
 /**
  * SECTION:ld-window-main

src/liblogdiag.h

@@ -0,0 +1,34 @@
+/*
+ * liblogdiag.h
+ *
+ * This file is a part of logdiag.
+ * Copyright Přemysl Janouch 2011. All rights reserved.
+ *
+ * See the file LICENSE for licensing information.
+ *
+ */
+
+#ifndef __LIBLOGDIAG_H__
+#define __LIBLOGDIAG_H__
+
+#include <gtk/gtk.h>
+#include <json-glib/json-glib.h>
+
+#include "ld-marshal.h"
+#include "ld-types.h"
+
+#include "ld-symbol.h"
+#include "ld-symbol-category.h"
+#include "ld-library.h"
+
+#include "ld-diagram-object.h"
+#include "ld-diagram-symbol.h"
+#include "ld-diagram.h"
+
+#include "ld-canvas.h"
+
+#include "ld-lua.h"
+#include "ld-lua-symbol.h"
+
+#endif /* ! __LIBLOGDIAG_H__ */
+