[vala] codegen: Use temporary variable for string concatenation

[Jürg Billeter <juergbi src gnome org>]

commit b0f95faaa13211747d0bd30e91471886e039c744
Author: Jürg Billeter <j bitron ch>
Date:   Wed Feb 16 13:22:12 2011 +0100

    codegen: Use temporary variable for string concatenation

 codegen/valaccodebasemodule.vala |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index e36b507..bc8604e 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -4994,11 +4994,17 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 						set_cvalue (expr, strcat);
 					} else {
 						// convert to g_strconcat (a, b, NULL)
+						var temp_var = get_temp_variable (expr.value_type, true, null, false);
+						var temp_ref = get_variable_cexpression (temp_var.name);
+						emit_temp_var (temp_var);
+
 						var ccall = new CCodeFunctionCall (new CCodeIdentifier ("g_strconcat"));
 						ccall.add_argument (cleft);
 						ccall.add_argument (cright);
 						ccall.add_argument (new CCodeConstant("NULL"));
-						set_cvalue (expr, ccall);
+
+						ccode.add_assignment (temp_ref, ccall);
+						set_cvalue (expr, temp_ref);
 					}
 					return;
 				}