From 591340a3a06b9f25db7d1a5dba53270e543e55c1 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@gmail.com>
Date: Mon, 21 Jan 2013 18:06:12 +0100
Subject: [PATCH] codegen: use #if GLIB_CHECK_VERSION for init functions

Tarballs with generated code should compile without warnings, and work
with various versions of glib (assuming the rest of the code is
correctly up to date, which is often the case if you don't use newer
functions)

https://bugzilla.gnome.org/show_bug.cgi?id=692218
---
 ccode/Makefile.am                  |  1 +
 ccode/valaccodeifsection.vala      | 50 ++++++++++++++++++++++++++++++
 codegen/valaccodemethodmodule.vala | 13 +++++---
 3 files changed, 59 insertions(+), 5 deletions(-)
 create mode 100644 ccode/valaccodeifsection.vala

diff --git a/ccode/Makefile.am b/ccode/Makefile.am
index c63dd06e0..5be8d793f 100644
--- a/ccode/Makefile.am
+++ b/ccode/Makefile.am
@@ -46,6 +46,7 @@ libvalaccode_la_VALASOURCES = \
 	valaccodeinvalidexpression.vala \
 	valaccodelabel.vala \
 	valaccodelinedirective.vala \
+	valaccodeifsection.vala \
 	valaccodemacroreplacement.vala \
 	valaccodememberaccess.vala \
 	valaccodemodifiers.vala \
diff --git a/ccode/valaccodeifsection.vala b/ccode/valaccodeifsection.vala
new file mode 100644
index 000000000..dd51743e0
--- /dev/null
+++ b/ccode/valaccodeifsection.vala
@@ -0,0 +1,50 @@
+/* valaccodeifsection.vala
+ *
+ * Copyright (C) 2013  Jürg Billeter
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ * 	Marc-André Lurau <marcandre.lureau@redhat.com>
+ */
+
+using GLib;
+
+/**
+ * Represents a section that should be processed on condition.
+ */
+public class Vala.CCodeIfSection : CCodeFragment {
+	/**
+	 * The expression
+	 */
+	public string expression { get; set; }
+
+	public CCodeIfSection (string expr) {
+		expression = expr;
+	}
+
+	public override void write (CCodeWriter writer) {
+		writer.write_string ("#if ");
+		writer.write_string (expression);
+		foreach (CCodeNode node in get_children ()) {
+			node.write_combined (writer);
+		}
+		writer.write_string ("#endif");
+		writer.write_newline ();
+	}
+
+	public override void write_declaration (CCodeWriter writer) {
+	}
+}
diff --git a/codegen/valaccodemethodmodule.vala b/codegen/valaccodemethodmodule.vala
index e6069f611..8a4333c3d 100644
--- a/codegen/valaccodemethodmodule.vala
+++ b/codegen/valaccodemethodmodule.vala
@@ -829,17 +829,20 @@ public abstract class Vala.CCodeMethodModule : CCodeStructModule {
 				ccode.add_expression (mem_profiler_init_call);
 			}
 
-			if (context.thread && !context.require_glib_version (2, 32)) {
+			if (context.thread) {
 				var thread_init_call = new CCodeFunctionCall (new CCodeIdentifier ("g_thread_init"));
 				thread_init_call.line = cmain.line;
 				thread_init_call.add_argument (new CCodeConstant ("NULL"));
-				ccode.add_expression (thread_init_call);
-			}
 
-			if (!context.require_glib_version (2, 36)) {
-				ccode.add_expression (new CCodeFunctionCall (new CCodeIdentifier ("g_type_init")));
+				var cond = new CCodeIfSection ("!GLIB_CHECK_VERSION (2,32,0)");
+				ccode.add_statement (cond);
+				cond.append (new CCodeExpressionStatement (thread_init_call));
 			}
 
+			var cond = new CCodeIfSection ("!GLIB_CHECK_VERSION (2,35,0)");
+			ccode.add_statement (cond);
+			cond.append (new CCodeExpressionStatement (new CCodeFunctionCall (new CCodeIdentifier ("g_type_init"))));
+
 			var main_call = new CCodeFunctionCall (new CCodeIdentifier (function.name));
 			if (m.get_parameters ().size == 1) {
 				main_call.add_argument (new CCodeIdentifier ("argv"));
-- 
2.47.2