From eed05c9045ae2f5a326bfd418006fa7fd76b7748 Mon Sep 17 00:00:00 2001
From: taz-007 <taz.007@zoho.com>
Date: Sat, 30 Nov 2019 14:24:40 +0100
Subject: [PATCH] improve error message when old version detected

Be more explicit about the --wipe command requiring to be executed from the source dir.
---
 mesonbuild/build.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 4201e35a4..35bc450a9 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -2477,7 +2477,8 @@ def load(build_dir: str) -> Build:
         raise MesonException(
             "Build data file {!r} references functions or classes that don't "
             "exist. This probably means that it was generated with an old "
-            "version of meson. Try running meson {} --wipe".format(filename, build_dir))
+            "version of meson. Try running from the source directory "
+            "meson {} --wipe".format(filename, build_dir))
     if not isinstance(obj, Build):
         raise MesonException(load_fail_msg)
     return obj