From: Tim 'mithro' Ansell <mithro@mithis.com>
Date: Thu, 15 Dec 2016 18:14:12 +0000 (+0100)
Subject: Don't modify file if contents hasn't changed.
X-Git-Tag: 24jan2021_ls180~1919^2~3
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8179a9ea2e1a0233c5b9f9caca68a5463f68eb61;p=litex.git

Don't modify file if contents hasn't changed.
---

diff --git a/litex/build/tools.py b/litex/build/tools.py
index 9e0880d5..34c054b1 100644
--- a/litex/build/tools.py
+++ b/litex/build/tools.py
@@ -23,6 +23,9 @@ def write_to_file(filename, contents, force_unix=False):
     newline = None
     if force_unix:
         newline = "\n"
+    if os.path.exists(filename):
+        if open(filename, "r", newline=newline).read() == contents:
+            return
     with open(filename, "w", newline=newline) as f:
         f.write(contents)