gnu: python-pycrypto: Fix build with Python 3.8.

* gnu/packages/patches/python-pycrypto-time-clock.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/python-crypto.scm (python-pycrypto)[source](patches): Add it.

1 files changed, 23 insertions, 0 deletions

diff --git a/gnu/packages/patches/python-pycrypto-time-clock.patch b/gnu/packages/patches/python-pycrypto-time-clock.patch
new file mode 100644
index 0000000000..9b7a8232a2
--- /dev/null
+++ b/gnu/packages/patches/python-pycrypto-time-clock.patch
@@ -0,0 +1,23 @@
+Drop use of the deprecated time.clock which was removed in Python 3.8.
+
+Adapted from upstream pull request:
+
+https://github.com/dlitz/pycrypto/pull/296
+
+diff --git a/lib/Crypto/Random/_UserFriendlyRNG.py b/lib/Crypto/Random/_UserFriendlyRNG.py
+--- a/lib/Crypto/Random/_UserFriendlyRNG.py
++++ b/lib/Crypto/Random/_UserFriendlyRNG.py
+@@ -73,8 +73,11 @@ class _EntropyCollector(object):
+         t = time.time()
+         self._time_es.feed(struct.pack("@I", int(2**30 * (t - floor(t)))))
+ 
+-        # Add the fractional part of time.clock()
+-        t = time.clock()
++        # Add the fractional part of time.process_time()
++        try:
++           t = time.process_time()
++        except AttributeError:
++           t = time.clock()
+         self._clock_es.feed(struct.pack("@I", int(2**30 * (t - floor(t)))))
+ 
+