[vala] Warn if -o is used in combination with -C

[Luca Bruno <lucabru src gnome org>]

commit 702ba3bd6bdb1cfd4c251fb7c32d06b719b9c711
Author: Florian Brosch <flo brosch gmail com>
Date:   Thu Jul 10 19:54:27 2014 +0200

    Warn if -o is used in combination with -C

 compiler/valacompiler.vala |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/compiler/valacompiler.vala b/compiler/valacompiler.vala
index 0ecd3cb..0962bac 100644
--- a/compiler/valacompiler.vala
+++ b/compiler/valacompiler.vala
@@ -201,6 +201,9 @@ class Vala.Compiler {
                context.symbols_filename = symbols_filename;
                context.includedir = includedir;
                context.output = output;
+               if (output != null && ccode_only) {
+                       Report.warning (null, "--output and -o have no effect when -C or --ccode is set");
+               }
                if (basedir == null) {
                        context.basedir = CodeContext.realpath (".");
                } else {