gnu: python-cython-0: Update to 0.29.37.

* gnu/packages/python-xyz.scm (python-cython-0): Update to 0.29.37.
  Use G-expressions.
  [build-system]: Inherit pyproject form python-cython.
  [arguments] <test-backend>: Use 'custom; <test-flags>: Utilize it
  instead of overwriting 'check phase.
  <phases>: Add 'pre-check; use default 'check.
  [inputs]: Inherit from python-cython.
  [native-inputs]: Likewise.
  [home-page]: Likewise.
  [synopsis]: Likewise.
  [description]: Likewise.

Change-Id: I97e8662f0a53aa9bc702b835a347900c7ebd5ea1

gnu/packages/python-xyz.scm

@@ -10158,55 +10158,44 @@ writing C extensions for Python as easy as Python itself.")
 (define-public python-cython-0
   (package
     (inherit python-cython)
-    (version "0.29.32")
+    ;; It's the latest version of 0.29. See
+    ;; <https://github.com/cython/cython/blob/0.29.37/CHANGES.rst>.
+    (version "0.29.37")
     (source
      (origin
        (method url-fetch)
        (uri (pypi-uri "Cython" version))
        (sha256
-        (base32 "1xqsihpqnfal29nb5kmw8z71nd4jbsnbz7p3lkr094xpb13wycw7"))))
-    (build-system python-build-system)
-    ;; we need the full python package and not just the python-wrapper
-    ;; because we need libpython3.3m.so
-    (inputs
-     (list python))
-    (native-inputs
-     ;; Needed for some tests that link against it.
-     (list libxcrypt))
+        (base32 "1ysca2r23h12ai9wrym4ci0nvgwm3lfijrpj9xfyxbclvnkd84zq"))))
     (arguments
-     `(#:phases
-       (modify-phases %standard-phases
-         (add-before 'check 'set-HOME
-           ;; some tests require access to "$HOME/.cython"
-           (lambda _ (setenv "HOME" "/tmp")))
-         (replace 'check
-           (lambda* (#:key tests? #:allow-other-keys)
-             ;; Disable compiler optimizations to greatly reduce the running
-             ;; time of the test suite.
-             (setenv "CFLAGS" "-O0")
-
-             (when tests?
-               (invoke "python" "runtests.py" "-vv"
+     (list
+      #:test-backend #~'custom
+      #:test-flags
+      #~(list "runtests.py"
+              "-vv"
               "-j" (number->string (parallel-job-count))
               ;; XXX: On 32-bit architectures, running the parallel tests
               ;; fails on many-core systems, see
               ;; <https://github.com/cython/cython/issues/2807>.
-                       ,@(if (not (target-64bit?))
-                             '("-x" "run.parallel")
-                             '())
-                       ,@(if (system-hurd?)
-                             '("-x" "test_class_ref"
+              #$@(if (not (target-64bit?))
+                     #~("-x" "run.parallel")
+                     #~())
+              #$@(if (system-hurd?)
+                     #~("-x" "test_class_ref"
                         "-x" "test_compiler_directives"
                         "-x" "test_lang_version")
-                             '())
+                     #~())
               ;; This test fails when running on 24 cores.
-                       "-x" "cpp_stl_conversion")))))))
-    (home-page "https://cython.org/")
-    (synopsis "C extensions for Python")
-    (description "Cython is an optimising static compiler for both the Python
-programming language and the extended Cython programming language.  It makes
-writing C extensions for Python as easy as Python itself.")
-    (license license:asl2.0)))
+              "-x" "cpp_stl_conversion")
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-before 'check 'pre-check
+            ;; some tests require access to "$HOME/.cython"
+            (lambda _
+              (setenv "HOME" "/tmp")
+              ;; Disable compiler optimizations to greatly reduce the running
+              ;; time of the test suite.
+              (setenv "CFLAGS" "-O0"))))))))
 
 ;; Needed for scipy and numpy
 (define-public python-cython-0.29.35