From 65c5efd14e57afbc8152cadf09fc30076c60532a Mon Sep 17 00:00:00 2001
From: Marius Bakke <marius@gnu.org>
Date: Thu, 22 Jul 2021 00:05:45 +0200
Subject: gnu: Python: Delete existing compiled files before compiling
 bytecode.

* gnu/packages/python.scm (python-3.9)[arguments]: Delete existing pycs before
calling "compileall".
---
 gnu/packages/python.scm | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'gnu/packages')

diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 0b763af924..8a8fe2bd2a 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -533,6 +533,14 @@ data types.")
                  ;; Disable hash randomization to ensure the generated .pycs
                  ;; are reproducible.
                  (setenv "PYTHONHASHSEED" "0")
+
+                 ;; XXX: Delete existing auto-generated pycs beforehand because
+                 ;; the -f argument does not necessarily overwrite all files,
+                 ;; leading to indeterministic results.
+                 (for-each (lambda (pyc)
+                             (delete-file pyc))
+                           (find-files out "\\.pyc$"))
+
                  (apply invoke
                         `(,,(if (%current-target-system)
                                 "python3"
-- 
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