[vala/staging] codegen: Don't include the full absolute path in line directives

[Rico Tzschichholz <ricotz src gnome org>]

commit 49e5fc64db0a5b748dcaaba9f257ba843c7c3934
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Apr 27 21:26:44 2017 +0200

    codegen: Don't include the full absolute path in line directives
    
    Only write source's filename prepended by the path relative to the
    directory the valac call origined from.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769935

 codegen/valaccodebasemodule.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 8c8879a..0752a02 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -592,7 +592,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
        public void push_line (SourceReference? source_reference) {
                line_directive_stack.add (current_line);
                if (source_reference != null) {
-                       current_line = new CCodeLineDirective (source_reference.file.filename, 
source_reference.begin.line);
+                       current_line = new CCodeLineDirective (source_reference.file.get_relative_filename 
(), source_reference.begin.line);
                        if (ccode != null) {
                                ccode.current_line = current_line;
                        }