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-rw-r--r--dev-python/cython/cython-0.29.21.ebuild1
-rw-r--r--dev-python/cython/files/cython-0.29.21-spawn-multiprocessing.patch29
2 files changed, 30 insertions, 0 deletions
diff --git a/dev-python/cython/cython-0.29.21.ebuild b/dev-python/cython/cython-0.29.21.ebuild
index e3ada54d8df6..2a1a1e79155c 100644
--- a/dev-python/cython/cython-0.29.21.ebuild
+++ b/dev-python/cython/cython-0.29.21.ebuild
@@ -31,6 +31,7 @@ BDEPEND="${RDEPEND}
PATCHES=(
"${FILESDIR}/cython-0.29.14-sphinx-update.patch"
+ "${FILESDIR}/cython-0.29.21-spawn-multiprocessing.patch"
)
SITEFILE=50cython-gentoo.el
diff --git a/dev-python/cython/files/cython-0.29.21-spawn-multiprocessing.patch b/dev-python/cython/files/cython-0.29.21-spawn-multiprocessing.patch
new file mode 100644
index 000000000000..0aa7212b9a34
--- /dev/null
+++ b/dev-python/cython/files/cython-0.29.21-spawn-multiprocessing.patch
@@ -0,0 +1,29 @@
+Needed to prevent a loop while calling cythonize on macOS - or any platform
+defaulting to the 'spawn' method, as Python 3.8 does on Darwin.
+
+https://github.com/cython/cython/pull/3263
+From 15ae78bb74a856836dd64828326f4f0812d36520 Mon Sep 17 00:00:00 2001
+From: Marcel Bargull <marcel.bargull@udo.edu>
+Date: Fri, 6 Dec 2019 18:21:19 +0100
+Subject: [PATCH] Disable parallel cythonization for "spawn" start method.
+
+---
+ Cython/Build/Dependencies.py | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/Cython/Build/Dependencies.py b/Cython/Build/Dependencies.py
+index 593e00a6ef..f9b9c15bc5 100644
+--- a/Cython/Build/Dependencies.py
++++ b/Cython/Build/Dependencies.py
+@@ -1073,6 +1073,11 @@ def copy_to_build_dir(filepath, root=os.getcwd()):
+
+ if N <= 1:
+ nthreads = 0
++ if nthreads:
++ import multiprocessing
++ if multiprocessing.get_start_method() == 'spawn':
++ print('Disabling parallel cythonization for "spawn" process start method.')
++ nthreads = 0
+ if nthreads:
+ import multiprocessing
+ pool = multiprocessing.Pool(