vala: Avoid problems with '\' in #line directives on Windows

Replace '\' with '/' in SourceFile.relative_path like in CodeContext.realpath().

  F:/msys64/home/x/test/test.vala.c: In function '_vala_main':
  F:/msys64/home/x/test/test.vala.c:12:9: warning: unknown escape sequence: '\M'
     12 | #line 3 "C:\MyFiles\test.vala"
        |         ^~~~~~~~~~~~~~~~~~~~~~

Fixes https://gitlab.gnome.org/GNOME/vala/issues/1353

1 files changed, 8 insertions, 1 deletions

diff --git a/vala/valasourcefile.vala b/vala/valasourcefile.vala
index 8f4175cde..c4ac064a7 100644
--- a/vala/valasourcefile.vala
+++ b/vala/valasourcefile.vala
@@ -33,7 +33,14 @@ public class Vala.SourceFile {
 
 	public string? relative_filename {
 		set {
-			this._relative_filename = value;
+			if (Path.DIR_SEPARATOR != '/') {
+				// don't use backslashes internally,
+				// to avoid problems in #line / #include directives
+				string[] components = value.split ("\\");
+				_relative_filename = string.joinv ("/", components);
+			} else {
+				_relative_filename = value;
+			}
 		}
 	}